ORCID Profile
0000-0003-0845-4827
Current Organisation
Hong Kong Polytechnic University
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Functional Materials | Materials Engineering | Condensed Matter Physics | Nanoscale Characterisation | Nanomaterials | Nanotechnology | Composite and Hybrid Materials | Photonics, Optoelectronics and Optical Communications | Electronic and Magnetic Properties of Condensed Matter; Superconductivity | Materials engineering | Medical Devices | Sensor Technology (Chemical aspects) | Nanomaterials | Functional materials | Energy Generation, Conversion and Storage Engineering | Compound Semiconductors |
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in Technology | Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Engineering | Management of Greenhouse Gas Emissions from Electricity Generation | Diagnostic Methods | Integrated Circuits and Devices | Health Status (e.g. Indicators of Well-Being) | Management of Greenhouse Gas Emissions from Manufacturing Activities
Related Links
Publications
CH3NH3PbCl3 Single Crystals: Inverse Temperature Crystallization and Visible-Blind UV-Photodetector
Publisher: American Chemical Society (ACS)
Date: 17-09-2015
DOI: 10.1021/ACS.JPCLETT.5B01666
Abstract: Single crystals of hybrid perovskites have shown remarkably improved physical properties compared to their polycrystalline film counterparts, underscoring their importance in the further development of advanced semiconductor devices. Here we present a new method of growing sizable CH3NH3PbCl3 single crystals based on the retrograde solubility behavior of hybrid perovskites. We show, for the first time, the energy band structure, charge recombination, and transport properties of CH3NH3PbCl3 single crystals. These crystals exhibit trap-state density, charge carrier concentration, mobility, and diffusion length comparable with the best quality crystals of methylammonium lead iodide or bromide perovskites reported so far. The high quality of the crystal along with its suitable optical band gap enabled us to build an efficient visible-blind UV-photodetector, demonstrating its potential in optoelectronic applications.
Scalable Routes to Janus Au−SiO2 and Ternary Ag−Au−SiO2 Nanoparticles
Publisher: American Chemical Society (ACS)
Date: 08-06-2010
DOI: 10.1021/CM101155V
Space-Charge-Mediated Anomalous Ferroelectric Switching in P(VDF–TrEE) Polymer Films
Publisher: American Chemical Society (ACS)
Date: 16-10-2014
DOI: 10.1021/AM5050136
Abstract: We report on the switching dynamics of P(VDF-TrEE) copolymer devices and the realization of additional substable ferroelectric states via modulation of the coupling between polarizations and space charges. The space-charge-limited current is revealed to be the dominant leakage mechanism in such organic ferroelectric devices, and electrostatic interactions due to space charges lead to the emergence of anomalous ferroelectric loops. The reliable control of ferroelectric switching in P(VDF-TrEE) copolymers opens doors toward engineering advanced organic memories with tailored switching characteristics.
Tunable Magnetic Interaction at the Atomic Scale in Oxide Heterostructures
Publisher: American Physical Society (APS)
Date: 14-10-2010
Epitaxy-Enabled Vapor–Liquid–Solid Growth of Tin-Doped Indium Oxide Nanowires with Controlled Orientations
Publisher: American Chemical Society (ACS)
Date: 07-07-2014
DOI: 10.1021/NL501163N
Abstract: Controlling the morphology of nanowires in bottom-up synthesis and assembling them on planar substrates is of tremendous importance for device applications in electronics, photonics, sensing and energy conversion. To date, however, there remain challenges in reliably achieving these goals of orientation-controlled nanowire synthesis and assembly. Here we report that growth of planar, vertical and randomly oriented tin-doped indium oxide (ITO) nanowires can be realized on yttria-stabilized zirconia (YSZ) substrates via the epitaxy-assisted vapor-liquid-solid (VLS) mechanism, by simply regulating the growth conditions, in particular the growth temperature. This robust control on nanowire orientation is facilitated by the small lattice mismatch of 1.6% between ITO and YSZ. Further control of the orientation, symmetry and shape of the nanowires can be achieved by using YSZ substrates with (110) and (111), in addition to (100) surfaces. Based on these insights, we succeed in growing regular arrays of planar ITO nanowires from patterned catalyst nanoparticles. Overall, our discovery of unprecedented orientation control in ITO nanowires advances the general VLS synthesis, providing a robust epitaxy-based approach toward rational synthesis of nanowires.
Abnormal blueshift of UV emission in single-crystalline ZnO nanowires
Publisher: Elsevier BV
Date: 09-2009
A 0D Lead‐Free Hybrid Crystal with Ultralow Thermal Conductivity
Publisher: Wiley
Date: 07-02-2019
Pure crystal orientation and anisotropic charge transport in large-area hybrid perovskite films
Publisher: Springer Science and Business Media LLC
Date: 10-11-2016
DOI: 10.1038/NCOMMS13407
Abstract: Controlling crystal orientations and macroscopic morphology is vital to develop the electronic properties of hybrid perovskites. Here we show that a large-area, orientationally pure crystalline (OPC) methylammonium lead iodide (MAPbI 3 ) hybrid perovskite film can be fabricated using a thermal-gradient-assisted directional crystallization method that relies on the sharp liquid-to-solid transition of MAPbI 3 from ionic liquid solution. We find that the OPC films spontaneously form periodic microarrays that are distinguishable from general polycrystalline perovskite materials in terms of their crystal orientation, film morphology and electronic properties. X-ray diffraction patterns reveal that the film is strongly oriented in the (112) and (200) planes parallel to the substrate. This film is structurally confined by directional crystal growth, inducing intense anisotropy in charge transport. In addition, the low trap-state density (7.9 × 10 13 cm −3 ) leads to strong lified stimulated emission. This ability to control crystal orientation and morphology could be widely adopted in optoelectronic devices.
Thickness-dependent magnetism and spin-glass behaviors in compressively strained BiFeO3 thin films
Publisher: AIP Publishing
Date: 13-06-2011
DOI: 10.1063/1.3600064
Abstract: Compressively strained BiFeO3 (BFO) films from 19 to 114 nm are epitaxially grown on LaAlO3 substrates, and their thickness-dependent evolutions of structural and magnetic properties are investigated. Across the morphotropic phase boundary, complex strain relaxation behaviors involving low-symmetry intermediate/bridging phases are observed. The fully strained 38 nm BFO film exhibits a saturation magnetization of ∼28 emu/cm3 at 300 K with a coercivity of 130 Oe while all films show a spin-glass behavior. These findings suggest that tailoring film thickness is effective to suppress the cycloidal magnetic modulation in BFO, leading to magnetic properties different from the bulk counterpart.
UV light emitting transparent conducting tin-doped indium oxide (ITO) nanowires
Publisher: IOP Publishing
Date: 23-03-2011
DOI: 10.1088/0957-4484/22/19/195706
Abstract: Multifunctional single crystalline tin-doped indium oxide (ITO) nanowires with tuned Sn doping levels are synthesized via a vapor transport method. The Sn concentration in the nanowires can reach 6.4 at.% at a synthesis temperature of 840 °C, significantly exceeding the Sn solubility in ITO bulks grown at comparable temperatures, which we attribute to the unique feature of the vapor-liquid-solid growth. As a promising transparent conducting oxide nanomaterial, layers of these ITO nanowires exhibit a sheet resistance as low as 6.4 Ω/[Symbol: see text] and measurements on in idual nanowires give a resistivity of 2.4 × 10(-4) Ω cm with an electron density up to 2.6 × 10(20) cm(-3), while the optical transmittance in the visible regime can reach ∼ 80%. Under the ultraviolet excitation the ITO nanowire s les emit blue light, which can be ascribed to transitions related to defect levels. Furthermore, a room temperature ultraviolet light emission is observed in these ITO nanowires for the first time, and the exciton-related radiative process is identified by using temperature-dependent photoluminescence measurements.
Enhancing Self-Trapped Exciton Emission via Energy Transfer in Two-Dimensional/Quantum Dot Perovskite Heterostructures
Publisher: American Chemical Society (ACS)
Date: 25-05-2022
Illumination-Induced Phase Segregation and Suppressed Solubility Limit in Br-Rich Mixed-Halide Inorganic Perovskites
Publisher: American Chemical Society (ACS)
Date: 28-07-2020
Colossal positive magnetoresistance in surface-passivated oxygen-deficient strontium titanite
Publisher: Springer Science and Business Media LLC
Date: 15-05-2015
DOI: 10.1038/SREP10255
Abstract: Modulation of resistance by an external magnetic field, i.e. magnetoresistance effect, has been a long-lived theme of research due to both fundamental science and device applications. Here we report colossal positive magnetoresistance (CPMR) ( ,000% at a temperature of 2 K and a magnetic field of 9 T) discovered in degenerate semiconducting strontium titanite (SrTiO 3 ) single crystals capped with ultrathin SrTiO 3 /LaAlO 3 bilayers. The low-pressure high-temperature homoepitaxial growth of several unit cells of SrTiO 3 introduces oxygen vacancies and high-mobility carriers in the bulk SrTiO 3 and the three-unit-cell LaAlO 3 capping layer passivates the surface and improves carrier mobility by suppressing surface-defect-related scattering. The coexistence of multiple types of carriers and inhomogeneous transport lead to the emergence of CPMR. This unit-cell-level surface engineering approach is promising to be generalized to others oxides and to realize devices with high-mobility carriers and interesting magnetoelectronic properties.
Oxidation kinetics of WTe2 surfaces in different environments
Publisher: American Chemical Society (ACS)
Date: 28-06-2020
Electrostatic Modulation of LaAlO3/SrTiO3 Interface Transport in an Electric Double‐Layer Transistor
Publisher: Wiley
Date: 13-11-2013
Perovskite Photodetectors Operating in Both Narrowband and Broadband Regimes
Publisher: Wiley
Date: 07-07-2016
Abstract: Photodetectors are designed, which operate in the broadband regime upon bottom illumination (from the indium tin oxide (ITO) side) and in the narrowband regime upon top illumination (from the air erovskite side). The narrowband photodetectors show high external quantum efficiency of above 10
Imaging the Reduction of Electron Trap States in Shelled Copper Indium Gallium Selenide Nanocrystals Using Ultrafast Electron Microscopy
Publisher: American Chemical Society (ACS)
Date: 06-2018
Chlorine-Assisted Size-Controlled Synthesis and Tunable Photoluminescence in Cr-Doped Silica Nanospheres
Publisher: American Chemical Society (ACS)
Date: 03-04-2009
DOI: 10.1021/JP900026G
Buffer-Layer-Assisted Epitaxial Growth of Perfectly Aligned Oxide Nanorod Arrays in Solution
Publisher: American Chemical Society (ACS)
Date: 04-10-2011
DOI: 10.1021/CG2007149
Anomalous exchange bias at collinear/noncollinear spin interface
Publisher: Springer Science and Business Media LLC
Date: 21-01-2013
DOI: 10.1038/SREP01094
Micro-light-emitting diodes with quantum dots in display technology
Publisher: Springer Science and Business Media LLC
Date: 11-05-2020
DOI: 10.1038/S41377-020-0268-1
Abstract: Micro-light-emitting diodes (μ-LEDs) are regarded as the cornerstone of next-generation display technology to meet the personalised demands of advanced applications, such as mobile phones, wearable watches, virtual/augmented reality, micro-projectors and ultrahigh-definition TVs. However, as the LED chip size shrinks to below 20 μm, conventional phosphor colour conversion cannot present sufficient luminance and yield to support high-resolution displays due to the low absorption cross-section. The emergence of quantum dot (QD) materials is expected to fill this gap due to their remarkable photoluminescence, narrow bandwidth emission, colour tuneability, high quantum yield and nanoscale size, providing a powerful full-colour solution for μ-LED displays. Here, we comprehensively review the latest progress concerning the implementation of μ-LEDs and QDs in display technology, including μ-LED design and fabrication, large-scale μ-LED transfer and QD full-colour strategy. Outlooks on QD stability, patterning and deposition and challenges of μ-LED displays are also provided. Finally, we discuss the advanced applications of QD-based μ-LED displays, showing the bright future of this technology.
Long-range electronic reconstruction to a dxz,yz-dominated Fermi surface below the LaAlO3/SrTiO3 interface
Publisher: Springer Science and Business Media LLC
Date: 18-06-2014
DOI: 10.1038/SREP05338
Localized Electrons Enhanced Ion Transport for Ultrafast Electrochemical Energy Storage
Publisher: Wiley
Date: 26-02-2020
Spintronic leaky-integrate-fire spiking neurons with self-reset and winner-takes-all for neuromorphic computing
Publisher: Springer Science and Business Media LLC
Date: 24-02-2023
DOI: 10.1038/S41467-023-36728-1
Abstract: Neuromorphic computing using nonvolatile memories is expected to tackle the memory wall and energy efficiency bottleneck in the von Neumann system and to mitigate the stagnation of Moore’s law. However, an ideal artificial neuron possessing bio-inspired behaviors as exemplified by the requisite leaky-integrate-fire and self-reset (LIFT) functionalities within a single device is still lacking. Here, we report a new type of spiking neuron with LIFT characteristics by manipulating the magnetic domain wall motion in a synthetic antiferromagnetic (SAF) heterostructure. We validate the mechanism of Joule heating modulated competition between the Ruderman–Kittel–Kasuya–Yosida interaction and the built-in field in the SAF device, enabling it with a firing rate up to 17 MHz and energy consumption of 486 fJ/spike. A spiking neuron circuit is implemented with a latency of 170 ps and power consumption of 90.99 μW. Moreover, the winner-takes-all is executed with a current ratio 4 between activated and inhibited neurons. We further establish a two-layer spiking neural network based on the developed spintronic LIFT neurons. The architecture achieves 88.5% accuracy on the handwritten digit database benchmark. Our studies corroborate the circuit compatibility of the spintronic neurons and their great potential in the field of intelligent devices and neuromorphic computing.
A Template and Catalyst-Free Metal-Etching-Oxidation Method to Synthesize Aligned Oxide Nanowire Arrays: NiO as an Example
Publisher: American Chemical Society (ACS)
Date: 08-07-2010
DOI: 10.1021/NN1005396
Abstract: Although NiO is one of the canonical functional binary oxides, there has been no report so far on the effective fabrication of aligned single crystalline NiO nanowire arrays. Here we report a novel vapor-based metal-etching-oxidation method to synthesize high-quality NiO nanowire arrays with good vertical alignment and morphology control. In this method, Ni foils are used as both the substrates and the nickel source NiCl(2) powder serves as the additional Ni source and provides Cl(2) to initiate mild etching. No template is deliberately employed instead a nanograined NiO scale formed on the NiO foil guides the vapor infiltration and assists the self-assembled growth of NiO nanowires via a novel process comprising simultaneous Cl(2) etching and gentle oxidation. Furthermore, using CoO nanowires and Co-doped NiO as ex les, we show that this general method can be employed to produce nanowires of other oxides as well as the doped counterparts.
Low‐Symmetry Monoclinic Phases and Polarization Rotation Path Mediated by Epitaxial Strain in Multiferroic BiFeO3 Thin Films
Publisher: Wiley
Date: 25-11-2010
Valence-Regulated Metal Doping of Mixed-Halide Perovskites to Modulate Phase Segregation and Solar Cell Performance
Publisher: American Chemical Society (ACS)
Date: 27-10-2022
Deterministic conversion between memory and threshold resistive switching via tuning the strong electron correlation
Publisher: Springer Science and Business Media LLC
Date: 07-06-2012
DOI: 10.1038/SREP00442
Optically controlled electroresistance and electrically controlled photovoltage in ferroelectric tunnel junctions
Publisher: Springer Science and Business Media LLC
Date: 29-02-2016
DOI: 10.1038/NCOMMS10808
Abstract: Ferroelectric tunnel junctions (FTJs) have recently attracted considerable interest as a promising candidate for applications in the next-generation non-volatile memory technology. In this work, using an ultrathin (3 nm) ferroelectric Sm 0.1 Bi 0.9 FeO 3 layer as the tunnelling barrier and a semiconducting Nb-doped SrTiO 3 single crystal as the bottom electrode, we achieve a tunnelling electroresistance as large as 10 5 . Furthermore, the FTJ memory states could be modulated by light illumination, which is accompanied by a hysteretic photovoltaic effect. These complimentary effects are attributed to the bias- and light-induced modulation of the tunnel barrier, both in height and width, at the semiconductor/ferroelectric interface. Overall, the highly tunable tunnelling electroresistance and the correlated photovoltaic functionalities provide a new route for producing and non-destructively sensing multiple non-volatile electronic states in such FTJs.
A SIMS study on Mg diffusion in Zn0.94Mg0.06O/ZnO heterostructures grown by metal organic chemical vapor deposition
Publisher: Elsevier BV
Date: 08-2011
Aminosilane Micropatterns on Hydroxyl-Terminated Substrates: Fabrication and Applications
Publisher: American Chemical Society (ACS)
Date: 30-11-2009
DOI: 10.1021/LA9039144
Abstract: The technique to pattern aminosilanes on hydroxyl-terminated substrates will open up extensive applications in many fields. There are some existing methods to pattern aminosilanes, in particular, (3-aminopropyl)triethoxysilane (APTES) on SiO(2) and glass substrates through indirect routes. However, few reports focus on the direct patterning of APTES by microcontact printing (microCP), due to the volatility of "inks" which consist of APTES and organic solvents. This report shows that high-quality APTES patterns on hydroxyl-terminated substrates can be directly obtained by microCP using an APTES aqueous solution as "ink". Gold nanoparticles (Au NPs) have been used to verify the presence and quality of APTES patterns on which they are selectively adsorbed. Thus-obtained Au NP patterns can serve as templates for the growth of ZnO nanostructures. Lectins are also successfully immobilized on the APTES patterns, with glutaraldehyde as linker. We believe that our method will serve as a general approach and find a wide range of applications in the fabrication of patterns and devices.
An integrated surface coating strategy to enhance the electrochemical performance of nickel-rich layered cathodes
Publisher: Elsevier BV
Date: 2022
Growing Crystalline Chalcogenidoarsenates in Surfactants: From Zero-Dimensional Cluster to Three-Dimensional Framework
Publisher: American Chemical Society (ACS)
Date: 15-01-2013
DOI: 10.1021/JA3116179
Abstract: Although surfactants have been widely used to tailor the size, shape, and surface properties of nanocrystals and control the pore size and phases of mesoporous frameworks, the use of surfactants as reaction media to grow chalcogenide crystals is unprecedented. In addition, compared with ionic liquids, surfactants are much cheaper and can have multifunctional properties such as acidic, basic, neutral, cationic, anionic, or even block. These features suggest that surfactants could be promising reaction platforms for the development of novel chalcogenide crystals. In this work, we used chalcogenidoarsenates as a model system to demonstrate our strategy. By using three different surfactants as reaction media, we obtained a series of novel thioarsenates ranging from a zero-dimensional (0D) cluster to a three-dimensional (3D) framework, namely, [NH(4)](8)[Mn(2)As(4)S(16)] (1), [Mn(NH(3))(6)][Mn(2)As(2)S(8)(N(2)H(4))(2)] (2), [enH][Cu(3)As(2)S(5)] (3), and [NH(4)][MnAs(3)S(6)] (4). The band gaps (estimated from the steep absorption edges) were found to be 2.31 eV for 1 (0D), 2.46 eV for 2 (1D), 1.91 eV for 3 (2D), and 2.08 eV for 4 (3D). The magnetic study of 4 indicated weak antiferromagnetic behavior. Our strategy of growing crystalline materials in surfactants could offer exciting opportunities for preparing novel crystalline materials with erse structures and interesting properties.
Electric field driven phase transition and possible twining quasi-tetragonal phase in compressively strained BiFeO3 thin films
Publisher: Springer Science and Business Media LLC
Date: 09-01-2012
Room temperature ferromagnetism in partially hydrogenated epitaxial graphene
Publisher: AIP Publishing
Date: 09-05-2011
DOI: 10.1063/1.3589970
Abstract: We report room temperature ferromagnetism in partially hydrogenated epitaxial graphene grown on 4HSiC(0001). The presence of ferromagnetism was confirmed by superconducting quantum interference devices measurements. Synchrotron-based near-edge x-ray absorption fine structure and high resolution electron energy loss spectroscopy measurements have been used to investigate the hydrogenation mechanism on the epitaxial graphene and the origin of room temperature ferromagnetism. The partial hydrogenation induces the formation of unpaired electrons in graphene, which together with the remnant delocalized π bonding network, can explain the observed ferromagnetism in partially hydrogenated epitaxial graphene.
Electro-thermally driven flexible robot arms based on stacking-controlled graphite nanocomposites
Publisher: Elsevier BV
Date: 11-2019
All-inorganic dual-phase halide perovskite nanorings
Publisher: Springer Science and Business Media LLC
Date: 20-07-2020
Light‐Responsive Ion‐Redistribution‐Induced Resistive Switching in Hybrid Perovskite Schottky Junctions
Publisher: Wiley
Date: 23-11-2017
Piezoelectricity in Two‐Dimensional Materials
Publisher: Wiley
Date: 25-02-2015
Observation of superconductivity in structure-selected Ti2O3 thin films
Publisher: Springer Science and Business Media LLC
Date: 06-2018
Continuous-wave Optically Pumped Lasing of Hybrid Perovskite VCSEL at Green Wavelength
Publisher: OSA
Date: 2017
High temperature excitonic lasing characteristics of randomly assembled SnO2 nanowires
Publisher: AIP Publishing
Date: 28-09-2009
DOI: 10.1063/1.3240867
Abstract: The lasing characteristics of randomly assembled SnO2 nanowires, whose excitonic gain is attributed to the exciton states bounded to the surface defects, are studied from room temperature up to 500 K. It is found that the amount of excited carriers under the lasing conditions is well below the Mott density of SnO2 so that high pumping intensities have less influence on the radiative recombination mechanism and wavelength of the lasing peaks. Furthermore, the redshift of lasing peaks is mainly due to the reduction of bandgap energy of SnO2 with the increase of temperature.
One-Dimensional Molecular Metal Halide Materials: Structures, Properties, and Applications
Publisher: Wiley
Date: 12-01-2021
Ultrathin Cu2O as an efficient inorganic hole transporting material for perovskite solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5NR07758C
Abstract: We demonstrate that ultrathin P-type Cu2O thin films fabricated by a facile thermal oxidation method can serve as a promising hole-transporting material in perovskite solar cells. Following a two-step method, inorganic-organic hybrid perovskite solar cells were fabricated and a power conversion efficiency of 11.0% was achieved. We found that the thickness and properties of Cu2O layers must be precisely tuned in order to achieve the optimal solar cell performance. The good performance of such perovskite solar cells can be attributed to the unique properties of ultrathin Cu2O, including high hole mobility, good energy level alignment with CH3NH3PbI3, and longer lifetime of photo-excited carriers. Combining the merits of low cost, facile synthesis, and high device performance, ultrathin Cu2O films fabricated via thermal oxidation hold promise for facilitating the developments of industrial-scale perovskite solar cells.
Electric field tuning of phase separation in manganite thin films
Publisher: American Physical Society (APS)
Date: 29-01-2014
Superconducting gap induced barrier enhancement in a BiFeO3-based heterostructure
Publisher: AIP Publishing
Date: 20-12-2010
DOI: 10.1063/1.3530446
Abstract: We report the synthesis and characterization of an epitaxial heterostructure composed of multiferroic BiFeO3 and superconducting YBa2Cu3O7−δ thin films grown on (001) SrTiO3. Both the superconductivity of YBa2Cu3O7−δ and the ferroelectricity of BiFeO3 are retained in the heterostructure. Current density-electric field characteristics measured from 30 to 170 K suggest a Schottky-emission-like transport at the BiFeO3/YBa2Cu3O7−δ interface. Furthermore, the temperature dependence of the barrier height shows an anomalous enhancement at TC, indicating an intimate coupling between the multiferroic and the superconducting layers.
Atmospheric effects on the photovoltaic performance of hybrid perovskite solar cells
Publisher: Elsevier BV
Date: 06-2015
Controlled Manipulation and in Situ Mechanical Measurement of Single Co Nanowire with a Laser-Induced Cavitation Bubble
Publisher: American Chemical Society (ACS)
Date: 30-08-2010
DOI: 10.1021/NL101051T
Abstract: The flow induced by a single laser-induced cavitation bubble is used to manipulate in idual Co nanowires. The short-lived (<20 μs) bubble with a maximum size of 45 μm is created in an aqueous solution with a laser pulse. Translation, rotation, and radial motion of the nanowire can be selectively achieved by varying the initial distance and orientation of the bubble with respect to the nanowire. Depending on the initial distance, the nanowire can be either pushed away or pulled toward the laser focus. No translation is observed for a distance further than approximately 60 μm, while at closer distance, the nanowire can be bent as a result of the fast flow induced during the bubble collapse. Studying the dynamics of the shape recovery allows an estimation of the Young's modulus of the nanowire. The low measured Young's modulus (in a range from 9.6 to 13.0 GPa) of the Co nanowire is attributed to a softening effect due to structural defects and surface oxidation layer. Our study suggests that this bubble-based technique allows selectively transporting, orienting, and probing in idual nanowires and may be exploited for constructing functional nanodevices.
A Solution‐Processed All‐Perovskite Memory with Dual‐Band Light Response and Tri‐Mode Operation
Publisher: Wiley
Date: 05-01-2022
Abstract: Integrating multiple semiconductors with distinct physical properties is a practical design strategy for realizing novel optoelectronic devices with unprecedented functionalities. In this work, a photonic resistive switching (RS) memory is demonstrated based on solution‐processed bilayers of strontium titanate (SrTiO 3 or STO) quantum dots (QDs) and all‐inorganic halide perovskite CsPbBr 3 (CPB) with an Ag/STO/CPB/Au architecture. Compared with the single‐layer STO or CPB RS device, the double‐layer device shows considerably improved RS performance with a high switching ratio over 10 5 , an endurance of 3000 cycles, and a retention time longer than 2 × 10 4 s. The formation of heterojunction between STO and CPB significantly enhances the high resistance state, and the separation of the active silver electrode and the CPB layer contributes to the long‐term stability. More importantly, the photonic RS device exhibits UV–visible dual‐band response due to the photogating effect and the light‐induced modification of the heterojunction barrier. Last, tri‐mode operation, i.e., photodetector, memory, and photomemory, is demonstrated via tailoring the light and electric stimuli. This bilayer device architecture provides a unique approach toward enhancing the performance of photoresponsive data‐storage devices.
High-quality bulk hybrid perovskite single crystals within minutes by inverse temperature crystallization
Publisher: Springer Science and Business Media LLC
Date: 06-07-2015
DOI: 10.1038/NCOMMS8586
Abstract: Single crystals of methylammonium lead trihalide perovskites (MAPbX 3 MA=CH 3 NH 3 + , X=Br − or I − ) have shown remarkably low trap density and charge transport properties however, growth of such high-quality semiconductors is a time-consuming process. Here we present a rapid crystal growth process to obtain MAPbX 3 single crystals, an order of magnitude faster than previous reports. The process is based on our observation of the substantial decrease of MAPbX 3 solubility, in certain solvents, at elevated temperatures. The crystals can be both size- and shape-controlled by manipulating the different crystallization parameters. Despite the rapidity of the method, the grown crystals exhibit transport properties and trap densities comparable to the highest quality MAPbX 3 reported to date. The phenomenon of inverse or retrograde solubility and its correlated inverse temperature crystallization strategy present a major step forward for advancing the field on perovskite crystallization.
Self-powered ultraviolet photovoltaic effects based on metal/SrTiO 3 Schottky junctions
Publisher: IOP Publishing
Date: 09-2013
Indigo: A Natural Molecular Passivator for Efficient Perovskite Solar Cells
Publisher: Wiley
Date: 09-2022
Nanoscale resistive switching and filamentary conduction in NiO thin films
Publisher: AIP Publishing
Date: 27-09-2010
DOI: 10.1063/1.3494267
Abstract: We fabricate regular arrays of nanoelectrodes on NiO thin films via nanosphere lithography and directly probe the nanoscale resistive switching using a conductive atomic force microscope. The unipolar resistive switching is consistent with the conducting filament formation/rupture mechanism, and the switching power is as low as 10−9 W. We find that only about half of devices are switchable, and the Monte Carlo simulation suggests strong correlations between the switching reliability, the electrode size, and the filament dimension and density.
Ferromagnetic interaction between Cu ions in the bulk region of Cu-doped ZnO nanowires
Publisher: American Physical Society (APS)
Date: 14-10-2011
Tuning Phase Transition and Thermochromic Properties of Vanadium Dioxide Thin Films via Cobalt Doping
Publisher: American Chemical Society (ACS)
Date: 24-04-2022
Abstract: Vanadium dioxide (VO
Narrow bandgap oxide nanoparticles coupled with graphene for high performance mid-infrared photodetection
Publisher: Springer Science and Business Media LLC
Date: 16-10-2018
DOI: 10.1038/S41467-018-06776-Z
Abstract: The pursuit of optoelectronic devices operating in the mid-infrared regime is driven by both fundamental interests and envisioned applications ranging from imaging, sensing to communications. Despite continued achievements in traditional semiconductors, notorious obstacles such as the complicated growth processes and cryogenic operation preclude the usage of infrared detectors. As an alternative path towards high-performance photodetectors, hybrid semiconductor/graphene structures have been intensively explored. However, the operation bandwidth of such photodetectors has been limited to visible and near-infrared regimes. Here we demonstrate a mid-infrared hybrid photodetector enabled by coupling graphene with a narrow bandgap semiconductor, Ti 2 O 3 ( E g = 0.09 eV), which achieves a high responsivity of 300 A W −1 in a broadband wavelength range up to 10 µm. The obtained responsivity is about two orders of magnitude higher than that of the commercial mid-infrared photodetectors. Our work opens a route towards achieving high-performance optoelectronics operating in the mid-infrared regime.
Suppression of photovoltaic effect by magnetic field in Pr0.65(Ca0.75Sr0.25)0.35MnO3/Nb:SrTiO3 heterostructure
Publisher: AIP Publishing
Date: 18-11-2013
DOI: 10.1063/1.4832331
Abstract: The heterostructure composed of Pr0.65(Ca0.75Sr0.25)0.35MnO3 and 0.7 wt. % Nb-doped SrTiO3 was fabricated. The heterostructure exhibits an asymmetric current-voltage relation similar to that of p-n junctions and an obvious photovoltaic effect with its maximum value of about 25.1 mV at T = 140 K. It is interesting that the magnetic field has a strong suppression effect on photovoltaic effect, and the maximum relative change of photovoltage under the magnetic field of 1 T is about 63% with the illumination of 15 mW/mm2 light (532 nm) at T ∼ 140 K. The physical mechanism is explained by the electronic phase separation mechanism.
Polarization enhancement and ferroelectric switching enabled by interacting magnetic structures in DyMnO3 thin films
Publisher: Springer Science and Business Media LLC
Date: 02-12-2013
DOI: 10.1038/SREP03374
Enhanced UV lasing emission from ZnO-MgO core-shell structure
Publisher: IEEE
Date: 2010
Synthesis, characterization and opto-electrical properties of ternary Zn2SnO4nanowires
Publisher: IOP Publishing
Date: 26-10-2010
DOI: 10.1088/0957-4484/21/46/465706
Abstract: Ternary oxides have the potential to display better electrical and optical properties than the commonly fabricated binary oxides. In our experiments, Zn(2)SnO(4) (ZTO) nanowires were synthesized via thermal evaporation and vapor phase transport. The opto-electrical performance of the nanowires was investigated. An in idual ZTO nanowire field-effect transistor was successfully fabricated for the first time and shows an on-off ratio of 10(4) and transconductance of 20.6 nS, which demonstrates the promising electronic performance of ZTO nanowire in an electrical device. Field emission experiments on ZTO nanowire film also indicate their potential application as a field emission electron source.
Substrate induced strain effects in epitaxial La0.67−xPrxCa0.33MnO3 thin films
Publisher: AIP Publishing
Date: 16-04-2003
DOI: 10.1063/1.1566090
Abstract: We have studied the physical properties of epitaxial La0.67−xPrxCa0.33MnO3(LPCMO) (x=0.13, 0.20, 0.27) thin films under different type and degree of substrate induced biaxial strain. Films with thickness of 300, 600, and 1000 Å grown on crystalline NdGaO3 (negligible strain), LaAlO3 (compressive strain), and SrTiO3 (tensile strain) by pulsed laser deposition are examined. Our data suggest occurrence of metastable phase mixtures in these films, with the volume fractions controlled by strain. In particular, melting of the charge ordered phase is seen to occur in thin films on SrTiO3 at fields as low as 1 T, in the low temperature regime. The deviation of ρ(T) from the effective medium theory further indicates that LPCMO thin films cannot be described as simple metal–insulator mixtures.
Single‐Crystal Hybrid Perovskite Platelets on Graphene: A Mixed‐Dimensional Van Der Waals Heterostructure with Strong Interface Coupling
Publisher: Wiley
Date: 06-02-2020
Giant in-plane anisotropy in manganite thin films driven by strain-engineered double exchange interaction and electronic phase separation
Publisher: AIP Publishing
Date: 19-09-2011
DOI: 10.1063/1.3643442
Abstract: We investigate epitaxial Pr0.65(Ca0.7Sr0.3)0.35MnO3 thin film grown on orthorhombic (110) NdGaO3 substrate which breaks the lattice symmetry and affects the phase separated ground state. As a result of the anisotropic substrate strain, giant in-plane magnetic and magnetotransport anisotropy are observed, which is related to the anisotropic coupling and competition between the double-exchange interaction and the Jahn-Teller distortion. Furthermore, the in-plane anisotropy shows a distinct enhancement near the metal-insulator transition, implying a significant contribution from the phase separation to the anisotropic transport behaviors.
ZnO Nanorods on a LaAlO3–SrTiO3 Interface: Hybrid 1D–2D Diodes with Engineered Electronic Properties
Publisher: Wiley
Date: 28-12-2015
Abstract: Integrating nanomaterials with different dimensionalities and properties is a versatile approach toward realizing new functionalities in advanced devices. Here, a novel diode-type heterostructure is reported consisting of 1D semiconducting ZnO nanorods and 2D metallic LaAlO3-SrTiO3 interface. Tunable insulator-to-metal transitions, absent in the in idual components, are observed as a result of the competing temperature-dependent conduction mechanisms. Detailed transport analysis reveals direct tunneling at low bias, Fowler-Nordheim tunneling at high forward bias, and Zener breakdown at high reverse bias. Our results highlight the rich electronic properties of such artificial diodes with hybrid dimensionalities, and the design principle may be generalized to other nanomaterials.
Imaging Localized Energy States in Silicon-Doped InGaN Nanowires Using 4D Electron Microscopy
Publisher: American Chemical Society (ACS)
Date: 30-01-2018
Symmetrical Negative Differential Resistance Behavior of a Resistive Switching Device
Publisher: American Chemical Society (ACS)
Date: 13-02-2012
DOI: 10.1021/NN204907T
Abstract: With a thin insulator sandwiched between two electrodes, the negative differential resistance (NDR) behavior has been frequently reported for its potential device applications. Here we report the experimental observation of a symmetric NDR characteristic in a resistive switching device based on TiO(2). We propose a charge storage mechanism for the NDR effect, with oxygen molecular ions working as the active source, in a thin insulating layer. Current-voltage measurements demonstrated a highly reproducible state at about 0.65 eV, and the photoelectron spectroscopy measurements showed that it complies well with the Ti3d band gap state. Our first-principle calculations confirm that charge storage and release arise from trapping and detrapping of oxygen molecular ions at the defect sites. The results and mechanism demonstrated here in a thin layer could be extended to other systems approaching molecular dimensions for device applications.
Ultraviolet light emission and excitonic fine structures in ultrathin single-crystalline indium oxide nanowires
Publisher: AIP Publishing
Date: 18-01-2010
DOI: 10.1063/1.3284654
Abstract: We report the ultraviolet light emission from ultrathin indium oxide (In2O3) nanowires fabricated by the vapor-liquid-solid method. The high crystalline quality of the s les is confirmed by using x-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Strong ultraviolet light emission is consistently observed in the temperature dependent photoluminescence measurements carried out between 10 and 300 K. Emissions related to free excitons and bound exciton complexes, donor-acceptor pair transition and its relevant longitudinal optical phonon replicas are identified and their temperature-dependent evolution is discussed in details.
Hole-mediated ferromagnetic enhancement and stability in Cu-doped ZnOS alloy thin films
Publisher: IOP Publishing
Date: 03-02-2012
DOI: 10.1088/0022-3727/45/7/075002
Abstract: We report room temperature ferromagnetism enhancement of Cu-doped ZnOS (Zn 1− x Cu x O 1− y S y ) alloy thin films with high hole concentration. The Zn 0.91 Cu 0.09 O 0.92 S 0.08 alloy thin films with a hole concentration of 4.3 × 10 19 cm −3 show the strongest magnetization of 1.5μ B /Cu. First-principles calculation shows that high hole concentration stabilizes the ferromagnetic ordering in the Zn 1− x Cu x O 1− y S y system, indicating a strong correlation between ferromagnetic stability and hole concentration. These results suggest that the Zn 1− x Cu x O 1− y S y alloy with high hole concentration is promising to find applications in spintronic devices.
Linking Phase Segregation and Photovoltaic Performance of Mixed-Halide Perovskite Films through Grain Size Engineering
Publisher: American Chemical Society (ACS)
Date: 04-2021
Prediction of giant magnetoelectric effect in LaMnO3/BaTiO3/SrMnO3 superlattice: The role of n-type SrMnO3/LaMnO3 interface
Publisher: AIP Publishing
Date: 15-08-2014
DOI: 10.1063/1.4893370
Abstract: We study the magnetoelectric coupling for the [001]-oriented (LaMnO3)2/(BaTiO3)5/(SrMnO3)2 superlattice, by means of the density functional theory. An interesting transition between ferromagnetic ordering and antiferromagnetic ordering is demonstrated by switching ferroelectric polarization in short-period superlattice structure. The predicted ferroelectrically induced magnetic reconstruction is less sensitive to the choice of Coulomb-correction U within GGA + U scheme. A possible explanation is given in terms of the favorable effect of n-type SrMnO3/LaMnO3 interface. Our results suggest that a sizable magnetoelectric effect may be achieved in the short-period LaMnO3/BaTiO3/SrMnO3 superlattice, hence promising application in electrically controlled magnetic data storage.
(Invited) heterostructured “Binary Materials” for Photodetection from Mid-Infrared, Visible, to X-Ray
Publisher: The Electrochemical Society
Date: 05-2019
DOI: 10.1149/MA2019-01/27/1326
Abstract: Light-matter interaction is a long-lasting theme in condensed matter physics and optoelectronics. Light detection in different wavelength regimes is the foundation of a wide range of sensing, imaging, medical and surveillance technologies. In this talk I will discuss the use of transition-metal oxides, hybrid organo-metal perovskites and other nanomaterials in "binary" mixed-dimensional heterostructures with proper bandgaps and architectures to detect photons with different wavelengths. First, for visible light detection, we demonstrate that combining 3D hybrid perovskites with high-mobility 1D carbon nanotubes or 2D two-dimensional metal dichalcogenides significantly enhances charge transport and device performance. Second, we report a mid-infrared (up to 10 um) hybrid graphene photodetector enabled via coupling graphene with a narrow bandgap semiconductor Ti 2 O 3 . Finally, using epitaxial ferroelectric/semiconductor oxide junctions with a current-perpendicular-to-plane geometry, we achieve a new X-ray detector with colossal persistent X-ray-induced photoconductivity.
Influence of oxygen pressure and aging on LaAlO3 films grown by pulsed laser deposition on SrTiO3 substrates
Publisher: AIP Publishing
Date: 24-02-2014
DOI: 10.1063/1.4866439
Hybrid Organic–Inorganic Materials and Composites for Photoelectrochemical Water Splitting
Publisher: American Chemical Society (ACS)
Date: 03-04-2020
Creation and annihilation of conducting filaments in mesoscopic manganite structures
Publisher: American Physical Society (APS)
Date: 26-12-2006
Pressure effects on iron-based superconductor families: Superconductivity, flux pinning and vortex dynamics
Publisher: Elsevier BV
Date: 07-2021
Complementary Charge Trapping and Ionic Migration in Resistive Switching of Rare-Earth Manganite TbMnO3
Publisher: American Chemical Society (ACS)
Date: 07-02-2013
DOI: 10.1021/AM301769F
Abstract: Perovskite rare-earth manganites like TbMnO₃ exhibit rich magnetic and electric phases, providing opportunities for next-generation multifunctional devices. Here, we report the nonvolatile bipolar switching of resistance and capacitance in TbMnO₃ thin films grown on conducting Nb:SrTiO₃ substrates. The device shows an ON/OFF resistance ratio of ∼1 × 10⁴, and the resistive switching is accompanied by a frequency-dependent capacitance switching. Detailed analysis of the conduction mechanisms reveals that the migration of oxygen vacancies and the charge trapping/detrapping at the heterojunction interface play important and complementary roles in the switching behaviors. Our results suggest that both electronic and ionic processes should be considered in order to elucidate the conduction mechanisms and the switching behaviors in such heterostructures made of complex oxides.
Tunable wettability in surface-modified ZnO-based hierarchical nanostructures
Publisher: AIP Publishing
Date: 28-04-2008
DOI: 10.1063/1.2918447
Abstract: Designing geometrical structures and making chemical modifications are two effective routes to tailor wettability. ZnO-based hierarchical nanostructures, in particular, vertically aligned nanoneedles and nanonails were employed as a platform to study the effect of surface morphology. The hydrophobicity and the variation of contact angle in the as-grown s les were attributed to the combined effects of surface roughness and partial water-solid contact. Subsequent chemical modifications with stearic acid led to superhydrophobic ZnO surfaces, while annealing in air resulted into superhydrophilicity. Under the alternations of coating and removal of stearic acid, reversible transitions between superhydrophilicity and hydrophobicity were realized.
Plasmonic‐Enhanced Light Harvesting and Perovskite Solar Cell Performance Using Au Biometric Dimers with Broadband Structural Darkness
Publisher: Wiley
Date: 21-05-2019
Anisotropic surface strain in single crystalline cobalt nanowires and its impact on the diameter-dependent Young's modulus
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3NR81284G
Abstract: Understanding and measuring the size-dependent surface strain of nanowires are essential to their applications in various emerging devices. Here, we report on the diameter-dependent surface strain and Young's modulus of single-crystalline Co nanowires investigated by in situ X-ray diffraction measurements. Diameter-dependent initial longitudinal elongation of the nanowires is observed and ascribed to the anisotropic surface stress due to the Poisson effect, which serves as the basis for mechanical measurements. As the nanowire diameter decreases, a transition from the "smaller is softer" regime to the "smaller is tougher" regime is observed in the Young's modulus of the nanowires, which is attributed to the competition between the elongation softening and the surface stiffening effects. Our work demonstrates a new nondestructive method capable of measuring the initial surface strain and estimating the Young's modulus of single crystalline nanowires, and provides new insights on the size effect.
Boosting moisture induced electricity generation from graphene oxide through engineering oxygen-based functional groups
Publisher: Elsevier BV
Date: 04-2022
Stable Bandgap-Tunable Hybrid Perovskites with Alloyed Pb–Ba Cations for High-Performance Photovoltaic Applications
Publisher: American Chemical Society (ACS)
Date: 16-12-2018
DOI: 10.1021/ACS.JPCLETT.8B03352
Abstract: The intrinsic poor stability of MAPbI
Tunable room-temperature ferromagnet using an iron-oxide and graphene oxide nanocomposite
Publisher: Springer Science and Business Media LLC
Date: 23-06-2015
DOI: 10.1038/SREP11430
Abstract: Magnetic materials have found wide application ranging from electronics and memories to medicine. Essential to these advances is the control of the magnetic order. To date, most room-temperature applications have a fixed magnetic moment whose orientation is manipulated for functionality. Here we demonstrate an iron-oxide and graphene oxide nanocomposite based device that acts as a tunable ferromagnet at room temperature. Not only can we tune its transition temperature in a wide range of temperatures around room temperature, but the magnetization can also be tuned from zero to 0.011 A m 2 /kg through an initialization process with two readily accessible knobs (magnetic field and electric current), after which the system retains its magnetic properties semi-permanently until the next initialization process. We construct a theoretical model to illustrate that this tunability originates from an indirect exchange interaction mediated by spin-imbalanced electrons inside the nanocomposite.
Simple and rapid synthesis of ultrathin gold nanowires, their self-assembly and application in surface-enhanced Raman scattering
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B822507A
Abstract: A simple and one-step method to rapidly synthesize single crystalline ultrathin gold nanowires at room temperature within a few hours has been developed, and the self-assembled ultrathin gold nanowires demonstrated an intriguing application in surface-enhanced Raman scattering (SERS).
Multifunctional CuO nanowire devices: p-type field effect transistors and CO gas sensors
Publisher: IOP Publishing
Date: 02-02-2009
DOI: 10.1088/0957-4484/20/8/085203
Abstract: We report the properties of a field effect transistor (FET) and a gas sensor based on CuO nanowires. CuO nanowire FETs exhibit p-type behavior. Large-scale p-type CuO nanowire thin-film transistors (10(4) devices in a 25 mm(2) area) are fabricated and we effectively demonstrate their enhanced performance. Furthermore, CuO nanowire exhibits high and fast response to CO gas at 200 degrees C, which makes it a promising candidate for a poisonous gas sensing nanodevice.
Recent progress with one-dimensional metal halide perovskites: from rational synthesis to optoelectronic applications
Publisher: Springer Science and Business Media LLC
Date: 24-02-2023
DOI: 10.1038/S41427-023-00465-0
Abstract: Metal halide perovskites can be readily synthesized, they exhibit tunable physical properties and excellent performance, and they are heavily studied optoelectronic materials. Compared to the typical three-dimensional perovskites, morphological-level one-dimensional (1D) nanostructures enable charge transport and photon propagation with low exciton binding energies and long charge-carrier diffusion lengths, while molecular-level 1D nanostructures exhibit good compositional and structural flexibilities, highly tunable bandgaps, strong quantum confinement effects, and excellent ambient stabilities. The 1D natures of these emerging halide perovskites enhance the performance of optoelectronic devices. Herein, we highlight recent progress realized in the syntheses and characterizations of both morphological- and molecular-level 1D halide perovskites with tunable structures, compositions, and properties, as well as their photovoltaic, light-emission, and photodetection applications. In addition, current challenges, future prospects, and promising research directions are discussed to provide guidance in advancing the field of 1D perovskites.
Dependence of negative differential resistance on electronic phase separation in unpatterned manganite films
Publisher: AIP Publishing
Date: 06-02-2012
DOI: 10.1063/1.3684806
Abstract: Here, we report that small but well-defined negative differential resistance (NDR) steps can be observed at critical voltages in unpatterned millimeter-scale manganite films of Pr0.65(Ca0.75Sr0.25)0.35MnO3. We systematically investigate the magneto-transport properties of strained thin films grown on LaAlO3 and SrTiO3 substrates and map out their phase diagrams which show temperature- and magnetic-field-dependent electronic phase separation (EPS). Our data suggest that the onset of NDR only occurs “deep” within the regions of EPS, underscoring the subtle nature of filamentary transport in manganite thin films with competing phases.
Origin of giant negative piezoelectricity in a layered van der Waals ferroelectric
Publisher: American Association for the Advancement of Science (AAAS)
Date: 05-04-2019
Abstract: Lattice topology and anisotropic chemical bonds underpin unusual negative longitudinal piezoelectricity in van der Waals solids.
High‐Performance Near‐Infrared Phototransistor Based on n‐Type Small‐Molecular Organic Semiconductor
Publisher: Wiley
Date: 13-12-2016
A Versatile Light‐Switchable Nanorod Memory: Wurtzite ZnO on Perovskite SrTiO3
Publisher: Wiley
Date: 25-04-2013
Electric Field Effects in Functional Metal Oxides
Publisher: Wiley
Date: 31-07-2013
Realizing a SnO2-based ultraviolet light-emitting diode via breaking the dipole-forbidden rule
Publisher: Springer Science and Business Media LLC
Date: 11-2012
DOI: 10.1038/AM.2012.56
High-Performance Ultraviolet-to-Infrared Broadband Perovskite Photodetectors Achieved via Inter-/Intraband Transitions
Publisher: American Chemical Society (ACS)
Date: 17-10-2017
Abstract: A high-performance vertically injected broadband UV-to-IR photodetector based on Gd-doped ZnO nanorods (NRs)/CH
Self-Organized Ferroelectric Domains Controlled by a Constant Bias from the Atomic Force Microscopy Tip.
Publisher: American Chemical Society (ACS)
Date: 05-11-2018
Abstract: The ferroelectric polarization switching along an external electric field is most important for the applications of ferroelectric memories and piezoelectric sensors and actuators however, the depolarization commonly occurs randomly and cannot be controlled exactly until now. Here, a tip bias introduces the polarization switching and a ∼10 μm-scale domain in a triglycine sulfate crystal, and then the polarization backswitching as a special depolarization introduces a series of ordered granular domains along a line being parallel to the c axis and through the tip which ides the original domain to two similar parts. Such backswitching is controlled by the surface charge change as a result of the interplay among polarization charges, mobile H
Intrinsic domain-wall resistivity in half-metallic manganite thin films
Publisher: American Physical Society (APS)
Date: 05-11-2012
Nitrogen-Doped Nanoporous Carbon Membranes with Co/CoP Janus-Type Nanocrystals as Hydrogen Evolution Electrode in Both Acidic and Alkaline Environments
Publisher: American Chemical Society (ACS)
Date: 07-04-2017
Abstract: Self-supported electrocatalysts being generated and employed directly as electrodes for energy conversion has been intensively pursued in the fields of materials chemistry and energy. Herein, we report a synthetic strategy to prepare freestanding hierarchically structured, nitrogen-doped nanoporous graphitic carbon membranes functionalized with Janus-type Co/CoP nanocrystals (termed as HNDCM-Co/CoP), which were successfully applied as a highly efficient, binder-free electrode in the hydrogen evolution reaction (HER). Benefited from multiple structural merits, such as a high degree of graphitization, three-dimensionally interconnected micro/meso/macropores, uniform nitrogen doping, well-dispersed Co/CoP nanocrystals, as well as the confinement effect of the thin carbon layer on the nanocrystals, HNDCM-Co/CoP exhibited superior electrocatalytic activity and long-term operation stability for HER under both acidic and alkaline conditions. As a proof-of-concept of practical usage, a 5.6 cm × 4 cm × 60 μm macroscopic piece of HNDCM-Co/CoP was prepared in our laboratory. Driven by a solar cell, electroreduction of water in alkaline conditions (pH 14) was performed, and H
Bridging NiCo layered double hydroxides and Ni3S2 for bifunctional electrocatalysts
Publisher: Elsevier BV
Date: 07-2021
Low‐Dimensional Lead‐Free Inorganic Perovskites for Resistive Switching with Ultralow Bias
Publisher: Wiley
Date: 29-04-2020
Ultrahigh Carrier Mobility Achieved in Photoresponsive Hybrid Perovskite Films via Coupling with Single‐Walled Carbon Nanotubes
Publisher: Wiley
Date: 22-02-2017
Abstract: Organolead trihalide perovskites have drawn substantial interest for photovoltaic and optoelectronic applications due to their remarkable physical properties and low processing cost. However, perovskite thin films suffer from low carrier mobility as a result of their structural imperfections such as grain boundaries and pinholes, limiting their device performance and application potential. Here we demonstrate a simple and straightforward synthetic strategy based on coupling perovskite films with embedded single-walled carbon nanotubes. We are able to significantly enhance the hole and electron mobilities of the perovskite film to record-high values of 595.3 and 108.7 cm
P -type electrical, photoconductive, and anomalous ferromagnetic properties of Cu2O nanowires
Publisher: AIP Publishing
Date: 16-03-2009
DOI: 10.1063/1.3097029
Abstract: Cu 2 O nanowires are synthesized by reduction of CuO nanowires with hydrogen gas. Strong green photoluminescence dominated by band-edge emission is observed. Field effect transistors fabricated from in idual Cu2O nanowires present high on-off ratio (& ) and high mobility (& cm2/V s). Furthermore, the device demonstrates a fast photoelectric response to blue illumination in air at room temperature. In addition, anomalous ferromagnetism appears in Cu2O nanowires, which may originate from the defects in Cu2O nanowires. This work shows the application potentials of the Cu2O nanowires, especially in an electrical and photonic device.
Improving thermal and electrical stability of silver nanowire network electrodes through integrating graphene oxide intermediate layers
Publisher: Elsevier BV
Date: 04-2020
Lab free protein-based moisture electric generators with a high electric output
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3EE00770G
Abstract: Illustration of protein-based MEG generating electricity by absorbing water from moisture.
Interfacial spin glass state and exchange bias in manganite bilayers with competing magnetic orders
Publisher: American Physical Society (APS)
Date: 21-02-2013
Optimizing surface chemistry of PbS colloidal quantum dot for highly efficient and stable solar cells via chemical binding
Publisher: Wiley
Date: 27-11-2021
Abstract: The surface chemistry of colloidal quantum dots (CQD) play a crucial role in fabricating highly efficient and stable solar cells. However, as‐synthesized PbS CQDs are significantly off‐stoichiometric and contain inhomogeneously distributed S and Pb atoms at the surface, which results in undercharged Pb atoms, dangling bonds of S atoms and uncapped sites, thus causing surface trap states. Moreover, conventional ligand exchange processes cannot efficiently eliminate these undesired atom configurations and defect sites. Here, potassium triiodide (KI 3 ) additives are combined with conventional PbX 2 matrix ligands to simultaneously eliminate the undercharged Pb species and dangling S sites via reacting with molecular I 2 generated from the reversible reaction KI 3 ⇌ I 2 + KI. Meanwhile, high surface coverage shells on PbS CQDs are built via PbX 2 and KI ligands. The implementation of KI 3 additives remarkably suppresses the surface trap states and enhances the device stability due to the surface chemistry optimization. The resultant solar cells achieve the best power convention efficiency of 12.1% and retain 94% of its initial efficiency under 20 h continuous operation in air, while the control devices with KI additive deliver an efficiency of 11.0% and retains 87% of their initial efficiency under the same conditions.
Artificial Tactile Perceptual Neuron with Nociceptive and Pressure Decoding Abilities
Publisher: American Chemical Society (ACS)
Date: 20-05-2020
Investigation of Structured Green-Band Emission and Electron−Phonon Interactions in Vertically Aligned ZnO Nanowires
Publisher: American Chemical Society (ACS)
Date: 22-09-2010
DOI: 10.1021/JP1064209
Exciton Localization and Optical Properties Improvement in Nanocrystal-Embedded ZnO Core–Shell Nanowires
Publisher: American Chemical Society (ACS)
Date: 24-01-2013
DOI: 10.1021/NL304433M
Abstract: We present a comparative investigation of the morphological, structural, and optical properties of vertically aligned ZnO nanowires (NWs) before and after high energy argon ion (Ar(+)) milling. It is found that the outer regions of the as-grown s le change from crystalline to amorphous, and ZnO core-shell NWs with ZnO nanocrystals embedded are formed after Ar(+) milling. Optical properties of the ZnO NWs have been investigated systematically through power and temperature dependent photoluminescence measurements, and the phenomenon of exciton localization as well as the relevant favorable photoluminescence characteristics is elucidated. Interestingly, under high density optical pumping at room temperature, coherent random lasing action is observed, which is ascribed to exciton localization and strong scattering. Our results on the unique optical properties of localized exciton in ZnO core-shell nanostructures shed light on developing stable and high-efficiency excitonic optoelectronic devices such as light-emitting diodes and lasers.
Correlated d ferromagnetism and photoluminescence in undoped ZnO nanowires
Publisher: AIP Publishing
Date: 15-03-2010
DOI: 10.1063/1.3340930
Abstract: We report the correlated d0 ferromagnetism and photoluminescence in undoped single-crystalline ZnO nanowires synthesized by using a vapor transport method. We systematically tune the oxygen deficiency in the ZnO nanowires from 4% to 20% by adjusting the growth conditions, i.e., selecting different catalyst (Au or Ag) and varying the growth temperature. Our study suggests that oxygen vacancies induce characteristic photoluminescence and significantly boost the room-temperature ferromagnetism. Such undoped ZnO nanowires with tunable magnetic and optical properties are promising to find applications in multifunctional spintronic and photonic nanodevices.
Rapsyn Interaction with Calpain Stabilizes AChR Clusters at the Neuromuscular Junction
Publisher: Elsevier BV
Date: 07-2007
DOI: 10.1016/J.NEURON.2007.06.031
Abstract: Agrin induces, whereas acetylcholine (ACh) disperses, ACh receptor (AChR) clusters during neuromuscular synaptogenesis. Such counteractive interaction leads to eventual dispersal of nonsynaptic AChR-rich sites and formation of receptor clusters at the postjunctional membrane. However, the underlying mechanisms are not well understood. Here we show that calpain, a calcium-dependent protease, is activated by the cholinergic stimulation and is required for induced dispersion of AChR clusters. Interestingly, the AChR-associated protein rapsyn interacted with calpain in an agrin-dependent manner, and this interaction inhibited the protease activity of calpain. Disrupting the endogenous rapsyn/calpain interaction enhanced CCh-induced dispersion of AChR clusters. Moreover, the loss of AChR clusters in agrin mutant mice was partially rescued by the inhibition of calpain via overexpressing calpastatin, an endogenous calpain inhibitor, or injecting calpeptin, a cell-permeable calpain inhibitor. These results demonstrate that calpain participates in ACh-induced dispersion of AChR clusters, and rapsyn stabilizes AChR clusters by suppressing calpain activity.
Gas chromatography–mass spectrometry analyses of encapsulated stable perovskite solar cells
Publisher: American Association for the Advancement of Science (AAAS)
Date: 19-06-2020
Abstract: Solar cells are subject to heating when operating in sunlight, and the organic components of hybrid perovskite solar cells, especially the commonly used methylammonium cation, can undergo thermal decomposition. Encapsulation can limit decomposition by bringing such reactions to equilibrium and can prevent exposure to damaging ambient moisture. Shi et al. examined several encapsulation schemes for perovskite films and devices by probing volatile products with gas chromatography–mass spectrometry (see the Perspective by Juarez-Perez and Haro). Pressure-tight polymer/glass stack encapsulation was effective in suppressing gas transfer and allowed solar cells containing methylammonium to pass harsh moisture and thermal cycling tests. Science , this issue p. eaba2412 see also p. 1309
Surfactant Media To Grow New Crystalline Cobalt 1,3,5-Benzenetricarboxylate Metal–Organic Frameworks
Publisher: American Chemical Society (ACS)
Date: 07-08-2014
DOI: 10.1021/IC5011133
Abstract: In this report, three new metal-organic frameworks (MOFs), [Co3(μ3-OH)(HBTC)(BTC)2Co(HBTC)]·(HTEA)3·H2O (NTU-Z30), [Co(BTC)]·HTEA·H2O (NTU-Z31), [Co3(BTC)4]·(HTEA)4 (NTU-Z32), where H3BTC = 1,3,5-benzenetricarboxylic acid, TEA = triethylamine, and NTU = Nanyang Technological University, have been successfully synthesized under surfactant media and have been carefully characterized by single-crystal X-ray diffraction, powder X-ray diffraction, thermogravimetric analysis, and IR spectromtry. NTU-Z30 has an unusual trimeric [Co3(μ3-OH)(COO)7] secondary building unit (SBU), which is different from the well-known trimeric [Co3O(COO)6] SBU. The topology studies indicate that NTU-Z30 and NTU-Z32 possess two new topologies, 3,3,6,7-c net and 2,8-c net, respectively, while NTU-Z31 has a known topology rtl type (3,6-c net). Magnetic analyses show that all three materials have weak antiferromagnetic behavior. Furthermore, NTU-Z30 has been selected as the heterogeneous catalyst for the aerobic epoxidation of alkene, and our results show that this material exhibits excellent catalytic activity as well as good stability. Our success in growing new crystalline cobalt 1,3,5-benzenetricarboxylate MOFs under surfactant media could pave a new road to preparing new erse crystalline inorganic materials through a surfactant-thermal method.
Formation of complex nanostructures driven by polar surfaces
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1JM12417J
Domain-related origin of magnetic relaxation in compressively strained manganite thin films
Publisher: AIP Publishing
Date: 02-07-2012
DOI: 10.1063/1.4733320
Abstract: Magnetic relaxation is ubiquitous in magnetic materials, and elucidation of the underlying mechanisms is important for achieving reliable device operations. Here, we systematically investigate the magnetic relaxation in compressively strained La0.7Sr0.3MnO3 thin films. Upon the removal of external magnetic field, the slow time-dependent increase of in-plane magnetization is correlated with the break-up of magnetic domains and the emergence of additional domain walls, whereas a reduction of magnetization for the initial short period dominates the magnetic relaxation at lower temperatures in thinner films. These relaxation effects underline the importance of domain dynamics in the properties of magnetic thin films.
Manipulation of planar oxygen defect arrangements in multifunctional magnèli titanium oxide hybrid systems: from energy conversion to water treatment
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0EE02550J
Abstract: This work demonstrates that the layer structured Magnèli titanium oxides possess co-existing functionalities, which can be applied to both energy harvesting and water treatment using one material.
Heterostructured WS2/CH3NH3PbI3 Photoconductors with Suppressed Dark Current and Enhanced Photodetectivity
Publisher: Wiley
Date: 23-03-2016
New insights on the substantially reduced bandgap of bismuth layered perovskite oxide thin films
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0TC05300G
Abstract: The underlying mechanism of bandgap reduction and enhanced photo-response in cobalt-doped bismuth layered perovskite oxide has been reported via the framework of density functional theory and experimental study.
S-doped C3N5 derived from thiadiazole for efficient photocatalytic hydrogen evolution
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3TA00318C
Abstract: Novel structured thiadiazole-attached carbon nitrides are first synthesized via sintering 5-amino-1,3,4-thiadiazole-2-thiol, demonstrating excellent performances towards photocatalytic H 2 evolution under visible light irradiation.
Quantum dots for photovoltaics
Publisher: Wiley
Date: 17-04-2021
The characterization and application of p-type semiconducting mesoporous carbon nanofibers
Publisher: Elsevier BV
Date: 06-2009
Enhanced Electrical Conductivity of Individual Conducting Polymer Nanobelts
Publisher: Wiley
Date: 03-06-2011
Nonvolatile resistive switching in spinel ZnMn2O4 and ilmenite ZnMnO3
Publisher: AIP Publishing
Date: 12-10-2009
DOI: 10.1063/1.3249630
Abstract: We report that spinel ZnMn2O4 and ilmenite ZnMnO3 show excellent unipolar resistive switching behaviors, with ON/OFF ratios larger than 104. For both oxides, retention of more than 10 h and good endurance are achieved. Conduction of the OFF state is dominated by the space-charge-limited conduction mechanism, while the Ohmic behavior dictates the ON state, which suggests a filamentary conduction mechanism. Our study introduces two promising materials candidates for nonvolatile resistive random access memory devices, and furthermore it suggests that formation and rupture of conducting filaments are universal in certain ternary oxides even though they may possess distinct crystalline structures.
A surfactant-thermal method to prepare four new three-dimensional heterometal–organic frameworks
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3DT51103K
Abstract: Here, we report on a surfactant-thermal method to prepare four new 3-D crystalline heterometal-organic frameworks (HMOFs). The results indicate that our new strategy for growing crystalline materials in surfactant media has great potential for the synthesis of novel MOFs with various structures.
Electron-beam irradiation-hard metal-halide perovskite nanocrystals
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA01898K
Abstract: Electron-beam irradiation-hard perovskite nanocrystals based on a doping strategy are reported.
Efficient Electrocatalytic Reduction of CO2 by Nitrogen‐Doped Nanoporous Carbon/Carbon Nanotube Membranes: A Step Towards the Electrochemical CO2 Refinery
Publisher: Wiley
Date: 06-2017
Room temperature positive magnetoresistance via charge trapping in polyaniline-iron oxide nanoparticle composites
Publisher: AIP Publishing
Date: 15-07-2013
DOI: 10.1063/1.4815998
Abstract: We demonstrate a polyaniline-iron oxide nanoparticle (PANI-NP) organic hybrid composite device with room temperature positive magnetoresistance of 85.7%. Temperature dependent resistivity measurements attribute this observation to the decrease in localization length of the charge carriers in the presence of an external magnetic field which result in them being trapped within the device between the insulating PANI layer, hence allowing the device to maintain its resistive state even when the power is switched off, thus exhibiting a memory effect.
Phase Selection Enabled Formation of Abrupt Axial Heterojunctions in Branched Oxide Nanowires
Publisher: American Chemical Society (ACS)
Date: 09-12-2011
DOI: 10.1021/NL2035089
Abstract: Rational synthesis of nanowires via the vapor-liquid-solid (VLS) mechanism with compositional and structural controls is vitally important for fabricating functional nanodevices from bottom up. Here, we show that branched indium tin oxide nanowires can be in situ seeded in vapor transport growth using tailored Au-Cu alloys as catalyst. Furthermore, we demonstrate that VLS synthesis gives unprecedented freedom to navigate the ternary In-Sn-O phase diagram, and a rare and bulk-unstable cubic phase can be selectively stabilized in nanowires. The stabilized cubic fluorite phase possesses an unusual almost equimolar concentration of In and Sn, forming a defect-free epitaxial interface with the conventional bixbyite phase of tin-doped indium oxide that is the most employed transparent conducting oxide. This rational methodology of selecting phases and making abrupt axial heterojunctions in nanowires presents advantages over the conventional synthesis routes, promising novel composition-modulated nanomaterials.
Giant Electric Bias‐Induced Tunability of Photoluminescence and Photoresistance in Hybrid Perovskite Films on Ferroelectric Substrates
Publisher: Wiley
Date: 16-08-2019
Interface characterization of all-perovskite oxide field effect heterostructures
Publisher: Springer Science and Business Media LLC
Date: 2002
Emergent ferromagnetism in ZnO/Al2O3 core-shell nanowires: Towards oxide spinterfaces
Publisher: AIP Publishing
Date: 08-07-2013
DOI: 10.1063/1.4813217
Giant Bulk Photostriction and Accurate Photomechanical Actuation in Hybrid Perovskites
Publisher: Wiley
Date: 03-08-2021
Abstract: It is well known that a material may be strained by mechanical, thermal, electric, magnetic, and light stimuli, and this effect has been extensively utilized in industries. However, the observed photostrictive effect usually occurs in the very thin surface layer and the photostriction of most bulk materials has been too small to be applied in a device until now. Here, a giant bulk photostriction is achieved, evidenced by the measured linear strain ε ≈ 0.72–0.43% for MAPbI 3 single crystal plates of 0.05–0.5 mm in thickness under the 532 nm illumination. More importantly, the MAPbI 3 single crystals also exhibit accurate photomechanical actuation functionality and the actuator can precisely adjust the displacement from hundreds of pm to tens of μm or the angle of a hard mirror from ≈10 −6 to 0.2 degree. The present work not only unveils the huge bulk photostriction in lead halide perovskite single crystals but also demonstrates a wireless photomechanical actuator which is much simpler and smaller than conventional piezoelectric actuators.
Spontaneous sharp metamagnetic transition in manganite films: influences of post-deposition annealing and measurement protocol
Publisher: Elsevier BV
Date: 04-2005
Shape and Orientation Controlled Hydrothermal Synthesis of Silicide and Metal Dichalcogenide on a Silicon Substrate
Publisher: American Chemical Society (ACS)
Date: 31-03-2020
10.1002/adma.202108616
Publisher: Wiley
Date: 28-04-2022
Abstract: Hybrid halide perovskites have emerged as highly promising photovoltaic materials because of their exceptional optoelectronic properties, which are often optimized via compositional engineering like mixing halides. It is well established that hybrid perovskites undergo a series of structural phase transitions as temperature varies. In this work, the authors find that phase transitions are substantially suppressed in mixed‐halide hybrid perovskite single crystals of MAPbI 3‐x Br x (MA = CH 3 NH 3 + and x = 1 or 2) using a complementary suite of diffraction and spectroscopic techniques. Furthermore, as a general behavior, multiple crystallographic phases coexist in mixed‐halide perovskites over a wide temperature range, and a slightly distorted monoclinic phase, hitherto unreported for hybrid perovskites, is dominant at temperatures above 100 K. The anomalous structural evolution is correlated with the glassy behavior of organic cations and optical phonons in mixed‐halide perovskites. This work demonstrates the complex interplay between composition engineering and lattice dynamics in hybrid perovskites, shedding new light on their unique properties.
High sensitivity low field magnetically gated resistive switching in CoFe2O4/La0.66Sr0.34MnO3 heterostructure
Publisher: AIP Publishing
Date: 23-04-2012
DOI: 10.1063/1.4707373
Abstract: The phenomenon of resistive switching (RS) has been demonstrated in several non-magnetic and some magnetic oxide systems, however the “magnetic” aspect of magnetic oxides has not been emphasized especially in terms of low field tunability. In our work, we examined the CoFe2O4/La0.66Sr0.34MnO3 all-magnetic oxide interface system for RS and discovered a very sharp (bipolar) transition at room temperature that can be gated with high sensitivity by low magnetic fields (∼0–100 mT). By using a number of characterizations, we show that this is an interface effect, which may open up interesting directions for manipulation of the RS phenomenon.
Bismuth telluride topological insulator synthesized using liquid metal alloys: Test of NO2 selective sensing
Publisher: Elsevier BV
Date: 03-2021
Enhancing the Performance of Quantum Dot Light-Emitting Diodes Using Room-Temperature-Processed Ga-Doped ZnO Nanoparticles as the Electron Transport Layer
Publisher: American Chemical Society (ACS)
Date: 05-2017
Abstract: Colloidal ZnO nanoparticle (NP) films are recognized as efficient electron transport layers (ETLs) for quantum dot light-emitting diodes (QD-LEDs) with good stability and high efficiency. However, because of the inherently high work function of such films, spontaneous charge transfer occurs at the QD/ZnO interface in such a QD-LED, thus leading to reduced performance. Here, to improve the QD-LED performance, we prepared Ga-doped ZnO NPs with low work functions and tailored band structures via a room-temperature (RT) solution process without the use of bulky organic ligands. We found that the charge transfer at the interface between the CdSe/ZnS QDs and the doped ZnO NPs was significantly weakened because of the incorporated Ga dopants. Remarkably, the as-assembled QD-LEDs, with Ga-doped ZnO NPs as the ETLs, exhibited superior luminances of up to 44 000 cd/m
In situ formation of new organic ligands to construct two novel self-charge-transfer Pb(ii )-based frameworks
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C1CE06006F
Asymmetric electroresistance of cluster glass state in manganites
Publisher: AIP Publishing
Date: 31-03-2014
DOI: 10.1063/1.4870480
Abstract: We report the electrostatic modulation of transport in strained Pr0.65(Ca0.75Sr0.25)0.35MnO3 thin films grown on SrTiO3 by gating with ionic liquid in electric double layer transistors (EDLT). In such manganite films with strong phase separation, a cluster glass magnetic state emerges at low temperatures with a spin freezing temperature of about 99 K, which is accompanied by the reentrant insulating state with high resistance below 30 K. In the EDLT, we observe bipolar and asymmetric modulation of the channel resistance, as well as an enhanced electroresistance up to 200% at positive gate bias. Our results provide insights on the carrier-density-dependent correlated electron physics of cluster glass systems.
Recent Progress on Titanium Sesquioxide: Fabrication, Properties, and Applications
Publisher: Wiley
Date: 16-06-2022
Abstract: Titanium sesquioxide (Ti 2 O 3 ) is drawing broad attention due to its fascinating physical properties and promising applications in the fields of energy, biomedicine, and electronics, among others. Its richness is due mainly to the strongly correlated 3 d 1 electrons on the Ti 3+ sites. In stark contrast to titanium dioxide (TiO 2 ), Ti 2 O 3 has an ultra‐narrow bandgap (≈0.1 eV) at room temperature, resulting from strong correlation among the 3 d 1 electrons. Distinct electrical and optical properties are introduced in Ti 2 O 3 , accompanied with varied intriguing applications. Remarkable photothermal conversion, infrared photodetection, and electrocatalytic properties have been reported and explored in the past few years. Based on its unique and excellent properties, Ti 2 O 3 has been utilized in seawater desalination, electrocatalytic water splitting, cancer therapy, hydrogen production, mid‐infrared photodetection, nitrogen fixation, Li‐ion batteries, etc. Herein, the fabrication, structural and electronic properties of Ti 2 O 3 are comprehensively introduced, with a focused summary of recent research progress on its applications. Finally, current challenges, opportunities, and future perspectives of Ti 2 O 3 are discussed.
Highly UV Resistant Inch‐Scale Hybrid Perovskite Quantum Dot Papers
Publisher: Wiley
Date: 24-07-2020
Electroluminescence from n-In_2O_3:Sn randomly assembled nanorods/p-SiC heterojunction
Publisher: Optica Publishing Group
Date: 08-07-2010
DOI: 10.1364/OE.18.015585
Evidence of cation vacancy induced room temperature ferromagnetism in Li-N codoped ZnO thin films
Publisher: AIP Publishing
Date: 31-10-2011
DOI: 10.1063/1.3657412
Abstract: Room temperature ferromagnetism (RTFM) was observed in Li-N codoped ZnO thin films [ZnO:(Li, N)] fabricated by plasma-assisted molecular beam epitaxy, and p-type ZnO:(Li, N) shows the strongest RTFM. Positron annihilation spectroscopy and low temperature photoluminescence measurements indicate that the RTFM in ZnO:(Li, N) is attributed to the defect complex related to VZn, such as VZn and Lii-NO-VZn complex, well supported by first-principles calculations. The incorporation of NO can stabilize and enhance the RTFM of ZnO:(Li, N) by combining with Lii to form Lii-NO complex, which restrains the compensation of Lii for VZn and makes the ZnO:(Li, N) conduct in p-type.
Emergence of Ferroelectricity in Halide Perovskites
Publisher: Wiley
Date: 11-05-2020
Crystal structure of hexakis(dimethyl sulfoxide-κO)manganese(II) tetraiodide
Publisher: International Union of Crystallography (IUCr)
Date: 15-11-0440
DOI: 10.1107/S2056989016017904
Abstract: The title salt, [Mn(C 2 H 6 OS) 6 ]I 4 , is made up from discrete [Mn(DMSO) 6 ] 2+ (DMSO is dimethyl sulfoxide) units connected through non-classical hydrogen bonds to linear I 4 2− tetraiodide anions. The Mn II ion in the cation, situated on a position with site symmetry -3., is octahedrally coordinated by O atoms of the DMSO molecule with an Mn—O distance of 2.1808 (12) Å. The I 4 2− anion contains a neutral I 2 molecule weakly coordinated by two iodide ions, forming a linear centrosymmetric tetraiodide anion. The title compound is isotypic with the Co, Ni, Cu, and Zn analogues.
Experimental and first-principles study of ferromagnetism in Mn-doped zinc stannate nanowires
Publisher: AIP Publishing
Date: 17-07-2013
DOI: 10.1063/1.4815884
Abstract: Room temperature ferromagnetism was observed in Mn-doped zinc stannate (ZTO:Mn) nanowires, which were prepared by chemical vapor transport. Structural and magnetic properties and Mn chemical states of ZTO:Mn nanowires were investigated by X-ray diffraction, superconducting quantum interference device (SQUID) magnetometry and X-ray photoelectron spectroscopy. Manganese predominantly existed as Mn2+ and substituted for Zn (MnZn) in ZTO:Mn. This conclusion was supported by first-principles calculations. MnZn in ZTO:Mn had a lower formation energy than that of Mn substituted for Sn (MnSn). The nearest neighbor MnZn in ZTO stabilized ferromagnetic coupling. This observation supported the experimental results.
Fabry–Pérot Oscillation and Room Temperature Lasing in Perovskite Cube‐Corner Pyramid Cavities
Publisher: Wiley
Date: 10-01-2018
Abstract: Recently, organometal halide perovskite-based optoelectronics, particularly lasers, have attracted intensive attentions because of its outstanding spectral coherence, low threshold, and wideband tunability. In this work, high-quality CH
Nanoscale Chemical and Valence Evolution at the Metal/Oxide Interface: A Case Study of Ti/SrTiO3
Publisher: Wiley
Date: 27-06-2016
Superconducting cuprates and magnetoresistive manganites: similarities and contrasts
Publisher: Elsevier BV
Date: 08-1999
Optical Cooper pair breaking spectroscopy of cuprate superconductors
Publisher: American Physical Society (APS)
Date: 14-03-2001
Solution‐Grown Monocrystalline Hybrid Perovskite Films for Hole‐Transporter‐Free Solar Cells
Publisher: Wiley
Date: 02-03-2016
Abstract: High-quality perovskite monocrystalline films are successfully grown through cavitation-triggered asymmetric crystallization. These films enable a simple cell structure, ITO/CH3 NH3 PbBr3 /Au, with near 100% internal quantum efficiency, promising power conversion efficiencies (PCEs) >5%, and superior stability for prototype cells. Furthermore, the monocrystalline devices using a hole-transporter-free structure yield PCEs ≈6.5%, the highest among other similar-structured CH3 NH3 PbBr3 solar cells to date.
Ultrahigh Carrier Mobility Achieved in Photoresponsive Hybrid Perovskite Films via Coupling with Single‐Walled Carbon Nanotubes
Publisher: Wiley
Date: 07-2017
Go beyond the limit: Rationally designed mixed-dimensional perovskite/semiconductor heterostructures and their applications
Publisher: Elsevier BV
Date: 2023
Giant nonvolatile manipulation of magnetoresistance in magnetic tunnel junctions by electric fields via magnetoelectric coupling
Publisher: Springer Science and Business Media LLC
Date: 16-01-2019
DOI: 10.1038/S41467-018-08061-5
Abstract: Electrically switchable magnetization is considered a milestone in the development of ultralow power spintronic devices, and it has been a long sought-after goal for electric-field control of magnetoresistance in magnetic tunnel junctions with ultralow power consumption. Here, through integrating spintronics and multiferroics, we investigate MgO-based magnetic tunnel junctions on ferroelectric substrate with a high tunnel magnetoresistance ratio of 235%. A giant, reversible and nonvolatile electric-field manipulation of magnetoresistance to about 55% is realized at room temperature without the assistance of a magnetic field. Through strain-mediated magnetoelectric coupling, the electric field modifies the magnetic anisotropy of the free layer leading to its magnetization rotation so that the relative magnetization configuration of the magnetic tunnel junction can be efficiently modulated. Our findings offer significant fundamental insight into information storage using electric writing and magnetic reading and represent a crucial step towards low-power spintronic devices.
Electroluminescent Solar Cells Based on CsPbI 3 Perovskite Quantum Dots
Publisher: Wiley
Date: 27-10-2022
Abstract: All‐inorganic CsPbX 3 (X = Cl, Br, I, or mixed halides) perovskite quantum dots (QDs) exhibit tunable optical bandgaps and narrow emission peaks, which have received worldwide interest in the field of both photovoltaics (PVs) and light‐emitting diodes (LEDs). Herein, it is reported a discovery that CsPbI 3 perovskite QD solar cell can simultaneously deliver high PV performance and intense electroluminescence. In specific, the multifunctional CsPbI 3 QD film is fabricated through a simple yet efficient solid‐state‐ligand exchange process using a tailored organic ligand triphenyl phosphite (TPPI). The function of QD surface manipulation using TPPI here is proven to be twofold, balancing the carrier transport and effectively passivating the QD surface to produce conductive and emissive QD film. The CsPbI 3 perovskite QD solar cell delivers a ch ion efficiency of 15.21% with improved open circuit voltage and high fill factor. Concurrently functioning as a red LED, the CsPbI 3 perovskite QD solar cell outputs electric power to light conversion efficiency approaching 4%, a record value for QD electroluminescent PVs. The results here indicate that these versatile perovskite QDs may be a promising candidate for fabricating multifunctional optoelectronic devices.
Hotspot-Induced Transformation of Surface-Enhanced Raman Scattering Fingerprints
Publisher: American Chemical Society (ACS)
Date: 28-05-2010
DOI: 10.1021/NN100269V
Abstract: The most studied effect of surface-enhanced Raman scattering (SERS) hotspots is the enormous Raman enhancement of the analytes therein. A less known effect, though, is that the formation of hotspots may cause the trapped analytes to change molecular orientation, which in turn leads to pronounced changes in SERS fingerprints. Here, we demonstrate this effect by creating and characterizing hotspots in colloidal solutions. Anisotropically functionalized Au nanorods were synthesized, whereby the sides were specifically encapsulated by polystyrene-block-poly(acrylic acid), leaving the ends unencapsulated and functionalized by a SERS analyte, 4-mercaptobenzoic acid. Upon salt treatment, these nanorods assemble into linear chains, forming hotspots that incorporate the SERS analyte. Enormous SERS enhancement was observed, particularly for some weak/inactive SERS modes that were not present in the original spectrum before the hotspots formation. Detailed spectral analysis showed that the variations of the SERS fingerprint were consistent with the reorientation of analyte molecules from nearly upright to parallel/tilted conformation on the Au surface. We propose that the aggregation of Au nanorods exerts physical stress on the analytes in the hotspots, causing the molecular reorientation. Such a hotspot-induced variation of SERS fingerprints was also observed in several other systems using different analytes.
Dye-sensitized solar cell with a titanium-oxide-modified carbon nanotube transparent electrode
Publisher: AIP Publishing
Date: 11-07-2011
DOI: 10.1063/1.3610488
Abstract: Transparent and conductive carbon-based materials are promising for window electrodes in solid-state optoelectronic devices. However, the catalytic activity to redox reaction limits their application as a working electrode in a liquid-type dye-sensitized solar cell (DSSC). In this letter, we propose and demonstrate a transparent carbon nanotubes (CNTs) film as the working electrode in a DSSC containing iodide/triiodide redox couples. This implementation is realized by inhibiting the charge-transfer kinetics at CNT/redox solution interface with an aid of thin titanium oxide film that facilitates the unidirectional flow of electrons in the cell without sacrificing the electrical and optical properties of CNT.
Size‐Induced Switching of Nanowire Growth Direction: a New Approach Toward Kinked Nanostructures
Publisher: Wiley
Date: 25-04-2016
Real-Space Mapping of Surface Trap States in CIGSe Nanocrystals Using 4D Electron Microscopy
Publisher: American Chemical Society (ACS)
Date: 31-05-2016
DOI: 10.1021/ACS.NANOLETT.6B01553
Abstract: Surface trap states in copper indium gallium selenide semiconductor nanocrystals (NCs), which serve as undesirable channels for nonradiative carrier recombination, remain a great challenge impeding the development of solar and optoelectronics devices based on these NCs. In order to design efficient passivation techniques to minimize these trap states, a precise knowledge about the charge carrier dynamics on the NCs surface is essential. However, selective mapping of surface traps requires capabilities beyond the reach of conventional laser spectroscopy and static electron microscopy it can only be accessed by using a one-of-a-kind, second-generation four-dimensional scanning ultrafast electron microscope (4D S-UEM) with subpicosecond temporal and nanometer spatial resolutions. Here, we precisely map the collective surface charge carrier dynamics of copper indium gallium selenide NCs as a function of the surface trap states before and after surface passivation in real space and time using S-UEM. The time-resolved snapshots clearly demonstrate that the density of the trap states is significantly reduced after zinc sulfide (ZnS) shelling. Furthermore, the removal of trap states and elongation of carrier lifetime are confirmed by the increased photocurrent of the self-biased photodetector fabricated using the shelled NCs.
Sb doping behavior and its effect on crystal structure, conductivity and photoluminescence of ZnO film in depositing and annealing processes
Publisher: Elsevier BV
Date: 04-2011
Multiferroic composite ferroelectric-ferromagnetic films
Publisher: AIP Publishing
Date: 02-12-2005
DOI: 10.1063/1.2135989
Abstract: Multiferroic behavior was confirmed for epitaxial composite ferroelectric-ferromagnetic heterostructures, using a ferromagnetic crystal as both substrate and straining medium. Heterostructures having 2-2 connectivity (plane-on-plane) were fabricated by chemical solution deposition of Pb(Zr0.3,Ti0.7)O3 (PZT) thin films on La1.2Sr1.8Mn2O7 (LSMO) single crystal substrates. Magnetostriction (0.13%) of the substrate at its transition temperature (∼105K) induces an abrupt 7.3% increase in switchable polarization of the PZT. This confirmation of elastic coupling induced by the onset of ferromagnetism is a first step toward fabricating such structures for study of the interrelationship of their magnetic and electrical field-dependent behaviors.
CsPbBr3 perovskite quantum-dot paper exhibiting a highest 3 dB bandwidth and realizing a flexible white-light system for visible-light communication
Publisher: Optica Publishing Group
Date: 10-11-2021
DOI: 10.1364/PRJ.434270
Abstract: We propose a flexible white-light system for high-speed visible-light communication (VLC) applications, which consists of a semipolar blue InGaN/GaN single-quantum-well micro-light-emitting diode (LED) on a flexible substrate pumping green CsPbBr 3 perovskite quantum-dot (PQD) paper in nanostructure form and red CdSe QD paper. The highest bandwidth for CsPbBr 3 PQD paper, 229 MHz, is achieved with a blue micro-LED pumping source and a high data transmission rate of 400 Mbps this is very promising for VLC application. An 817 MHz maximum bandwidth and a 1.5 Gbps transmission speed are attained by the proposed semipolar blue micro-LEDs. The proposed flexible white light system and the high-bandwidth PQD paper could pave the way for VLC wearable devices.
Role of donor-acceptor complexes and impurity band in stabilizing ferromagnetic order in Cu-doped SnO2 thin films
Publisher: AIP Publishing
Date: 23-04-2012
DOI: 10.1063/1.4705419
Abstract: Our complementary magnetic and photoluminescence measurements reveal the correlation between the donor-acceptor complex and the ferromagnetic order in Cu-doped SnO2 thin films. Oxygen vacancies (VO) and Cu dopants form defect complexes of donor-acceptor pairs, and the associated spin-polarized impurity band leads to the narrowing of bandgap. Electronic structure calculations based on the first-principles method demonstrate that the Cu-VO complex has low formation energy and can stabilize the ferromagnetic coupling. Our results suggest that intrinsic defects and their complexes with dopants play a key role for establishing the ferromagnetic order in doped wide-bandgap oxides.
Optimization of the selenization pressure enabling efficient Cu2ZnSn(S,Se)4 solar cells
Publisher: Wiley
Date: 16-11-2022
Abstract: In spite of the merits such as Earth abundance and high performance, Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells suffer from unfavorable Sn Zn antisite defects and complexes, which act as nonradiative recombination centers and deteriorate the open‐circuit voltage ( V OC ). Therefore, the management of Sn composition is the prerequisite for achieving high‐efficiency CZTSSe photovoltaic devices. At present, the Sn‐related composition and defect modifications at different selenization pressures remain unclear, which restrain the development of efficient kesterite solar cells. Herein, a facile yet effective strategy to accurately adjust the Sn content in CZTSSe films by simply optimizing the selenization pressure is demonstrated. Compared with the widely used atmospheric pressure, it is unveiled that the appropriate negative pressure (0.7 atm) can tailor the optimal Sn content in the absorber layer, influencing both the Sn‐related defects and the microstructures. In contrast, a lower (0.4 atm) and a higher (1.3 atm) selenization pressure results in undesirable deep Cu Sn defects and a Sn(S,Se) 2 secondary phase, respectively. A ch ion device fabricated at this optimal selenization pressure (0.7 atm) exhibits a power conversion efficiency of 11.32% with a V OC of 0.496 V. This study paves the path toward highly efficient kesterite solar cells by tailoring the composition‐dependent defects.
Metal Oxides as Efficient Charge Transporters in Perovskite Solar Cells
Publisher: Wiley
Date: 10-07-2017
Favorable ultraviolet photoelectric effects in TbMnO3/Nb–SrTiO3 heterostructures
Publisher: Elsevier BV
Date: 12-2014
Origin of green emission and charge trapping dynamics in ZnO nanowires
Publisher: American Physical Society (APS)
Date: 18-03-2013
Optical Cooper pair breaking spectroscopy of YBa2Cu2.8Zn0.2O7−δthin films
Publisher: IOP Publishing
Date: 14-02-2002
Electrical transport and magnetic properties ofLa
Publisher:
American Physical Society (APS)
Date:
21-03-2002
Publisher: American Physical Society (APS)
Date: 21-03-2002
High‐Performance Optoelectronic Gas Sensing Based on All‐Inorganic Mixed‐Halide Perovskite Nanocrystals with Halide Engineering
Publisher: Wiley
Date: 17-06-2023
Abstract: Gas sensors are of great interest to portable and miniaturized sensing technologies with applications ranging from air quality monitoring to explosive detection and medical diagnostics, but the existing chemiresistive NO 2 sensors still suffer from issues such as poor sensitivity, high operating temperature, and slow recovery. Herein, a high‐performance NO 2 sensors based on all‐inorganic perovskite nanocrystals (PNCs) is reported, achieving room temperature operation with ultra‐fast response and recovery time. After tailoring the halide composition, superior sensitivity of ≈67 at 8 ppm NO 2 is obtained in CsPbI 2 Br PNC sensors with a detection level down to 2 ppb, which outperforms other nanomaterial‐based NO 2 sensors. Furthermore, the remarkable optoelectronic properties of such PNCs enable dual‐mode operation, i.e., chemiresistive and chemioptical sensing, presenting a new and versatile platform for advancing high‐performance, point‐of‐care NO 2 detection technologies.
CrSi2 Hexagonal Nanowebs
Publisher: American Chemical Society (ACS)
Date: 26-10-2010
DOI: 10.1021/JA106402P
Abstract: Single-crystalline CrSi(2) nanostructures with a unique hexagonal nanoweb morphology have been successfully synthesized for the first time. These nanowebs span 150-200 nm and are composed of nanowire segments with a thickness of 10-30 nm. It is proposed that surface charges on the {101̅0} sidewalls and the minimization of electrostatic energy induce the nanoweb formation. Calculations of the electrostatic energies were used to predict the transitions between different modes of bending, which agreed well with the experimental observations.
Quantum dot passivation of halide perovskite films with reduced defects, suppressed phase segregation, and enhanced stability
Publisher: Wiley
Date: 29-11-2022
Abstract: Structural defects are ubiquitous for polycrystalline perovskite films, compromising device performance and stability. Herein, a universal method is developed to overcome this issue by incorporating halide perovskite quantum dots (QDs) into perovskite polycrystalline films. CsPbBr 3 QDs are deposited on four types of halide perovskite films (CsPbBr 3 , CsPbIBr 2 , CsPbBrI 2 , and MAPbI 3 ) and the interactions are triggered by annealing. The ions in the CsPbBr 3 QDs are released into the thin films to passivate defects, and concurrently the hydrophobic ligands of QDs self‐assemble on the film surfaces and grain boundaries to reduce the defect density and enhance the film stability. For all QD‐treated films, PL emission intensity and carrier lifetime are significantly improved, and surface morphology and composition uniformity are also optimized. Furthermore, after the QD treatment, light‐induced phase segregation and degradation in mixed‐halide perovskite films are suppressed, and the efficiency of mixed‐halide CsPbIBr 2 solar cells is remarkably improved to over 11% from 8.7%. Overall, this work provides a general approach to achieving high‐quality halide perovskite films with suppressed phase segregation, reduced defects, and enhanced stability for optoelectronic applications.
Growth of Doped SrTiO3 Ferroelectric Nanoporous Thin Films and Tuning of Photoelectrochemical Properties with Switchable Ferroelectric Polarization
Publisher: American Chemical Society (ACS)
Date: 11-11-2019
Abstract: Ferroelectric polarization is an intriguing physical phenomenon for tuning charge-transport properties and finds application in a wide range of optoelectronic devices. So far, ferroelectric materials in a planar geometry or chemically grown nanostructures have been used. However, these structural architectures possess serious disadvantages such as small surface areas and structural defects, respectively, leading to reduced performance. Herein, the growth of room-temperature ferroelectric nanoporous/nanocolumnar structure of Ag,Nb-codoped SrTiO
Interface-induced magnetic coupling in multiferroic/ferromagnetic bilayer: An ultrafast pump-probe study
Publisher: AIP Publishing
Date: 07-04-2014
DOI: 10.1063/1.4870580
Abstract: By use of optical pump-probe measurement, we study the relaxation dynamics of a multiferroic-ferromagnetic TbMnO3/La0.7Sr0.3MnO3 bilayer. The relaxation dynamics of both layers are well separated in time allowing us to investigate the magnetic coupling across the bilayer. We observe that the relaxation dynamics of the in idual layers in the bilayer s le are the result of the interplay between the intrinsic magnetic order and the induced interfacial effect. Our data suggest the existence of induced ferromagnetic order in the TbMnO3 layer and antiferromagnetic order in the La0.7Sr0.3MnO3 layer.
Electrode dependence of resistive switching in Mn-doped ZnO: Filamentary versus interfacial mechanisms
Publisher: AIP Publishing
Date: 10-05-2010
DOI: 10.1063/1.3428365
Abstract: We carry out a comparative study on resistive switching in Mn-doped ZnO thin films s les grown on Pt and Si show unipolar and bipolar switching behaviors, respectively. Fittings of the current-voltage curves and area dependence of the device resistance reveal the filamentary conduction in Pt/Mn:ZnO/Pt. On the other hand, the interfacial effect dominates in Pt/Mn:ZnO/Si, and its low resistance state exponentially relaxes toward the high resistance state in contrast to the good data retention in Pt/Mn:ZnO/Pt. Our results suggest that selecting electrodes dictates the resistive switching mechanism presumably by affecting the migration dynamics of oxygen vacancies.
Configurable Resistive Switching between Memory and Threshold Characteristics for Protein-Based Devices
Publisher: Wiley
Date: 13-05-2015
Correlating the Composition-Dependent Structural and Electronic Dynamics of Inorganic Mixed Halide Perovskites
Publisher: American Chemical Society (ACS)
Date: 26-02-2020
Emerging Transistor Applications Enabled by Halide Perovskites
Publisher: American Chemical Society (ACS)
Date: 17-11-2021
Schottky junctions on perovskite single crystals: light-modulated dielectric constant and self-biased photodetection
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TC02828D
Abstract: Schottky-junctions formed on hybrid perovskite CH 3 NH 3 PbBr 3 single crystals show significant light-induced tuning of dielectric constant and self-biased photodetection.
Manipulation and Microrheology of Carbon Nanotubes with Laser-Induced Cavitation Bubbles
Publisher: American Physical Society (APS)
Date: 07-01-2010
Efficient Electrocatalytic Reduction of CO2 by Nitrogen‐Doped Nanoporous Carbon/Carbon Nanotube Membranes: A Step Towards the Electrochemical CO2 Refinery
Publisher: Wiley
Date: 06-2017
Abstract: Herein we introduce a straightforward, low cost, scalable, and technologically relevant method to manufacture an all-carbon, electroactive, nitrogen-doped nanoporous-carbon/carbon-nanotube composite membrane, dubbed "HNCM/CNT". The membrane is demonstrated to function as a binder-free, high-performance gas diffusion electrode for the electrocatalytic reduction of CO
Efficient Photon Recycling and Radiation Trapping in Cesium Lead Halide Perovskite Waveguides
Publisher: American Chemical Society (ACS)
Date: 25-05-2018
Multi-functional multi-gate one-transistor process-in-memory electronics with foundry processing and footprint reduction
Publisher: Springer Science and Business Media LLC
Date: 29-06-2022
DOI: 10.1038/S43246-022-00261-3
Abstract: Logic gates are fundamental components of integrated circuits, and integration strategies involving multiple logic gates and advanced materials have been developed to meet the development requirements of high-density integrated circuits. However, these strategies are still far from being widely applicable owing to their incompatibility with the modern silicon-based foundry lines. Here, we propose a silicon-foundry-line-based multi-gate one-transistor design to simplify the conventional multi-transistor logic gates into one-transistor gates, thus reducing the circuit footprint by at least 40%. More importantly, the proposed configuration could simultaneously provide the multi-functionalities of logic gates, memory, and artificial synapses. In particular, our design could mimic the artificial synapses in three dimensions while simultaneously being implemented by standard silicon-on-insulator process technology. The foundry-line-compatible one-transistor design has great potential for immediate and widespread applications in next-generation multifunctional electronics.
Shape‐Enhanced Photocatalytic Activities of Thoroughly Mesoporous ZnO Nanofibers
Publisher: Wiley
Date: 23-06-2016
Abstract: 1D mesoporous materials have attracted extensive interest recently, owning to their fascinating properties and versatile applications. However, it remains as a grand challenge to develop a simple and efficient technique to produce oxide nanofibers with mesoporous architectures, controlled morphologies, large surface areas, and optimal performances. In this work, a facile foaming-assisted electrospinning strategy with foaming agent of tea saponin is used to produce thoroughly mesoporous ZnO nanofibers with high purity and controlled morphology. Interestingly, mesoporous fibers with elliptical cross-section exhibit the significantly enhanced photocatalytic activity for hydrogen production, as compared to the counterparts with circular and rectangular cross-sections, and they also perform better than the commercial ZnO nanopowders. The unexpected shape dependence of photocatalytic activities is attributed to the different stacking modes of the mesoporous fibers, and a geometrical model is developed to account for the shape dependence. This work represents an important step toward producing thoroughly mesoporous ZnO nanofibers with tailored morphologies, and the discovery that fibers with elliptical cross-section render the best performance provides a valuable guideline for improving the photocatalytic performance of such mesoporous nanomaterials.
Cu-Doped ZnO Nanoneedles and Nanonails: Morphological Evolution and Physical Properties
Publisher: American Chemical Society (ACS)
Date: 07-06-2008
DOI: 10.1021/JP710837H
Enhanced Power Conversion Efficiency via Hybrid Ligand Exchange Treatment of p-Type PbS Quantum Dots
Publisher: American Chemical Society (ACS)
Date: 29-04-2020
Transition from Positive to Negative Photoconductance in Doped Hybrid Perovskite Semiconductors
Publisher: Wiley
Date: 20-08-2019
Electroresistance and Electronic Phase Separation in Mixed-Valent Manganites
Publisher: American Physical Society (APS)
Date: 06-2001
Ambient Electrosynthesis of Ammonia: Electrode Porosity and Composition Engineering
Publisher: Wiley
Date: 09-07-2018
Abstract: Ammonia, a key precursor for fertilizer production, convenient hydrogen carrier, and emerging clean fuel, plays a pivotal role in sustaining life on Earth. Currently, the main route for NH
General Strategy for Fabricating Thoroughly Mesoporous Nanofibers
Publisher: American Chemical Society (ACS)
Date: 21-11-2014
DOI: 10.1021/JA508840C
Abstract: Recently, preparation of mesoporous fibers has attracted extensive attentions because of their unique and broad applications in photocatalysis, optoelectronics, and biomaterials. However, it remains a great challenge to fabricate thoroughly mesoporous nanofibers with high purity and uniformity. Here, we report a general, simple and cost-effective strategy, namely, foaming-assisted electrospinning, for producing mesoporous nanofibers with high purity and enhanced specific surface areas. As a proof of concept, the as-fabricated mesoporous TiO2 fibers exhibit much higher photocatalytic activity and stability than both the conventional solid counterparts and the commercially available P25. The abundant vapors released from the introduced foaming agents are responsible for the creation of pores with uniform spatial distribution in the spun precursor fibers. The present work represents a critically important step in advancing the electrospinning technique for generating mesoporous fibers in a facile and universal manner.
Strain-Enhanced Charge Transfer and Magnetism at a Manganite/Nickelate Interface
Publisher: American Chemical Society (ACS)
Date: 21-08-2018
Abstract: The strain effect on charge transfer in correlated oxide La
Robust Room-Temperature Ferromagnetism with Giant Anisotropy in Nd-Doped ZnO Nanowire Arrays
Publisher: American Chemical Society (ACS)
Date: 02-07-2012
DOI: 10.1021/NL301226K
Abstract: As an important class of spintronic material, ferromagnetic oxide semiconductors are characterized with both charge and spin degrees of freedom, but they often show weak magnetism and small coercivity, which limit their applications. In this work, we synthesized Nd-doped ZnO nanowire arrays which exhibit stable room temperature ferromagnetism with a large saturation magnetic moment of 4.1 μ(B)/Nd as well as a high coercivity of 780 Oe, indicating giant magnetic anisotropy. First-principles calculations reveal that the remarkable magnetic properties in Nd-doped ZnO nanowires can be ascribed to the intricate interplay between the spin moments and the Nd-derived orbital moments. Our complementary experimental and theoretical results suggest that these magnetic oxide nanowires obtained by the bottom-up synthesis are promising as nanoscale building blocks in spintronic devices.
Designed growth and patterning of perovskite nanowires for lasing and wide color gamut phosphors with long-term stability
Publisher: Elsevier BV
Date: 07-2020
Topotactic phase transformations by concerted dual-ion migration of B-site cation and oxygen in multivalent cobaltite La–Sr–Co–Ox films
Publisher: Elsevier BV
Date: 12-2020
Seeded growth of two-dimensional dendritic gold nanostructures
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C1CC14721H
Abstract: We show that seeded growth can be applied to creating two-dimensional (2D) dendritic Au nanostructures on s le grids, which can be directly characterized by transmission electron microscopy (TEM). The 2D synthesis of highly consistent structures offers a novel mechanistic perspective on the aggregation of colloidal Au nanocrystals on a surface.
Ultraviolet coherent random lasing in randomly assembled SnO2 nanowires
Publisher: AIP Publishing
Date: 15-06-2009
DOI: 10.1063/1.3157842
Abstract: Although nanostructured SnO2 exhibited ultraviolet stimulated emission at room temperature, the low emission intensities and occurrence of gain saturation restricted them to be considered as luminescent materials for semiconductor lasers. In this letter, we find that a large ultraviolet excitonic gain can be obtained from SnO2 nanowires coated with an amorphous layer. Under effective pumping, ultraviolet coherent random lasing can be realized from randomly assembled SnO2 nanowires at room temperature.
Self-Assembled Shape- and Orientation-Controlled Synthesis of Nanoscale Cu3Si Triangles, Squares, and Wires
Publisher: American Chemical Society (ACS)
Date: 03-09-2008
DOI: 10.1021/NL8015208
Abstract: Controlling shape and orientation is important for the synthesis of functional nanomaterials. In this work, nanoscale Cu3Si triangles, squares, and wires have been grown on Si(111), (100), and (110) substrates, respectively, through a template-free Au-nanoparticle-assisted vapor transport method. The sides of nanotriangles and nanosquares and the growth direction of the nanowires are all along Si , giving rise to long-range ordering of the nanostructures. Au nanoparticles absorb Cu vapor and facilitate the rate-limited diffusion of Si, which is critical for the shape-controlled growth of Cu3Si. This bottom-up approach to synthesize shape- and orientation-controlled Cu3Si nanostructures might be applicable to the tailored growth of other materials.
Recent progress in short- to long-wave infrared photodetection using 2D materials and heterostructures
Publisher: Wiley
Date: 04-12-2021
Abstract: The extraordinary electronic, optical, and mechanical characteristics of 2D materials make them promising candidates for optoelectronics, specifically in infrared (IR) detectors owing to their flexible composition and tunable optoelectronic properties. This review presents the recent progress in IR detectors composed of 2D materials and their hybrid structures, including graphene, black phosphorous, transition metal dichalcogenides, halide perovskite as well as other new layered materials and their heterostructures. The focus is on the short‐wave, mid‐wave, and long‐wave infrared regimes, which pose a grand challenge for rational materials and device designs. The dependence of the device performance on the optical and electronic properties of 2D materials is extensively discussed, aiming to present the general strategies for designing optoelectronic devices with optimal performance. Furthermore, the recent results on 2D material‐based heterostructures are presented with an emphasis on the relationship between band alignment, charge transfer, and IR photodetection. Finally, a summary is given as well as the discussion of existing challenges and future directions.
Sub‐second Lifetime of Photocarriers in Hybrid Lead Halide Perovskite
Publisher: Wiley
Date: 22-11-2022
Abstract: Recently lead halide perovskite based solar cells have rapidly advanced and their power conversion efficiency (PCE) increased to 25.7%. The progress has been attributed to the super‐long carriers’ lifetime (τ) and long diffusion length ( L D ) of the photocarriers, however it has been a challenge to precisely characterize and understand the super‐long τ and L D of photocarriers. Here, a MAPbI 3 single crystal exhibits four different τ which increase with L D extending from nm scale to mm scale. The prior two lifetimes estimated by transient photoluminescence (TPL) spectra are in the range of ns which comes from the recombination of photocarriers in the tens of nm thick surface layer. In contrast, the third lifetime estimated by transient open‐circuit voltage is hundreds of µs, which is a result of the excess photocarriers diffusing hundreds of µm to electrodes. Finally, the fourth lifetime estimated from the transient photoconductance is as long as sub‐second since the low‐density photocarriers under an electric field drift across the mm‐scale high‐quality single crystal. This study not only clarifies the physical mechanisms of four different lifetimes of photocarriers but also facilitates the design of novel electronics with the halide perovskite semiconductors.
Surfactant-Thermal Syntheses, Structures, and Magnetic Properties of Mn–Ge–Sulfides/Selenides
Publisher: American Chemical Society (ACS)
Date: 10-09-2014
DOI: 10.1021/IC501282D
Abstract: Although either surfactants or amines have been investigated to direct the crystal growth of metal chalcogenides, the synergic effect of organic amines and surfactants to control the crystal growth has not been explored. In this report, several organic bases (hydrazine monohydrate, ethylenediamine (en), 1,2-propanediamine (1,2-dap), and 1,3-propanediamine (1,3-dap)) have been employed as structure-directing agents (SDAs) to prepare four novel chalcogenides (Mn3Ge2S7(NH3)4 (1), [Mn(en)2(H2O)][Mn(en)2MnGe3Se9] (2), (1,2-dapH)2{[Mn(1,2-dap)2]Ge2Se7} (3), and (1,3-dapH)(puH)MnGeSe4(4) (pu = propyleneurea) under surfactant media (PEG-400). These as-prepared new crystalline materials provide erse metal coordination geometries, including MnS3N tetrahedra, MnGe2Se7 trimer, and MnGe3Se10 T2 cluster. Compounds 1-3 have been fully characterized by single-crystal X-ray diffraction (XRD), powder XRD, UV-vis spectra, Fourier transform infrared spectroscopy, and thermogravimetric analysis. Moreover, magnetic measurements for compound 1 showed an obvious antiferromagnetic transition at ~9 K. Our research not only enriches the structural chemistry of the transitional-metal/14/16 chalcogenides but also allows us to better understand the synergic effect of organic amines and surfactants on the crystallization of metal chalcogenides.
Effect of charge compensation on the photoelectrochemical properties of Ho-doped SrTiO3 films
Publisher: AIP Publishing
Date: 25-03-2013
DOI: 10.1063/1.4798829
Abstract: When Ho3+ ions are substituted at Sr2+ sites in SrTiO3 (STO), the excess positive charges are compensated via three complementary routes: (1) strontium vacancies, (2) titanium vacancies, and (3) conduction electrons. In this study, we show that the photoelectrochemical properties of Ho-doped STO films are dependent on the charge compensation mechanisms. The compensation mechanism via the titanium vacancies exhibits the highest photocurrent density, which is 1.7 times higher than that of the pure STO s le. Based on the measured dielectric properties and electrochemical impedance spectroscopy data, we propose that the enhanced dielectric constant of the films can enlarge the width of the space charge region at the film/liquid interface, which eventually leads to the increase of the photocurrent density. Further enhancement of photocurrent density is obtained in the s les decorated with appropriate amounts of Pt nanoparticles, showing the advantage of composites for achieving the efficient photoelectrochemical property.
Bound magnetic polarons and p-d exchange interaction in ferromagnetic insulating Cu-doped ZnO
Publisher: AIP Publishing
Date: 18-04-2011
DOI: 10.1063/1.3579544
Abstract: A systematic study on the magnetic and electrical transport properties of single-phase wurtzite Zn1−xCuxO is performed. Efros variable range hopping dominates the conduction, which is accompanied by a ferromagnetic order up to 700 K for x& %. Both the first-principles calculations and Cu/Al co-doping experiments suggest that the spontaneous spin polarization originates from the p-d exchange interaction between O 2p and Cu 3d orbitals. Furthermore, our results are consistent with the scenario that the intrinsic ferromagnetism is established through indirect interactions between bound magnetic polarons mediated by magnetic impurities.
Polaronic transport and magnetism in Ag-doped ZnO
Publisher: AIP Publishing
Date: 28-11-2011
DOI: 10.1063/1.3665401
Evolution of magnetic bubble domains in manganite films
Publisher: AIP Publishing
Date: 25-07-2011
DOI: 10.1063/1.3615708
Abstract: We report a thickness-dependent evolution of magnetic domains from long stripe-like to bubble-like entities in La1−xSrxMnO3 (x ∼ 0.3) (LSMO) films grown on LaAlO3 substrates. By using 2-D fast Fourier transformation of magnetic force microscopy images and power spectral density function, we accurately determine the domain width in LSMO films with a wide range of thickness (50–325 nm). We find that the domain size scales with the Kittel’s square root law [C. Kittel, Phys. Rev. 70, 965 (1946).] only when reduced film thicknesses are used, which suggests the critical role of substrate-film interaction in domain formation.
Embedding 1D Conducting Channels into 3D Isoporous Polymer Films for High‐Performance Humidity Sensing
Publisher: Wiley
Date: 08-2018
Abstract: Isoporous block copolymer (BCP) films have received exponential interest as highly selective membranes, stemming from their unique morphological features, but their applications in functional devices remain to be realized. Now single-walled carbon nanotubes (CNTs) were efficiently incorporated into isoporous block copolymer films for chemiresistive sensing at room temperature. Leveraging the efficient charge extraction ability of CNTs together with nanochannel arrays aligned perpendicular to the surface of the films, an ultrafast response time of 0.3 s was achieved for humidity detection with a sensor response of about 800 on changing humidity from 10 % to 95 %. Furthermore, the sensor also responds to various organic vapors, underscoring its promising detection capability.
Enhancing the Efficiency and Stability of PbS Quantum Dot Solar Cells through Engineering an Ultrathin NiO Nanocrystalline Interlayer
Publisher: American Chemical Society (ACS)
Date: 15-09-2020
Photoinduced phase transition and relaxation in bare SrTiO3 single crystals
Publisher: AIP Publishing
Date: 16-07-2013
DOI: 10.1063/1.4815950
Abstract: The photoinduced insulator-metal phase transition and relaxation characteristics have been investigated in bare SrTiO3 single crystals. The photoinduced relaxation time constant after the irradiation shows an increase with increasing temperatures. The SrTiO3 single crystal has a cutoff wavelength and an absorption edge of spectrum at about 385 nm, which agrees well with the band gap. The photocurrent responsivity is 1.36 × 10−5 A/W at 300 nm wavelength. The relative change in resistance is more than above six orders at room temperature, possessing potential applications in ultraviolet sensitive and detecting devices.
dc leakage behavior and conduction mechanism in (BiFeO3)m(SrTiO3)m superlattices
Publisher: AIP Publishing
Date: 09-06-2008
DOI: 10.1063/1.2937843
Abstract: Leakage current behavior of (BiFeO3)m(SrTiO3)m superlattice structures was studied and analyzed at different temperatures (303–473K) in the light of various models. While bulk limited Poole–Frenkel emission was observed to dominate the leakage current in the temperature range of 303–383K, the space charge limited conduction was observed up to 473K. With a Poole–Frenkel emission type of conduction, the activation energy range of ∼0.06–0.25eV was calculated. The physical parameters, calculated from the analysis, correlate with the intrinsic properties. Such analysis of leakage current facilitates interface engineering of heterostructures for device applications.
Observation of magnetoelectric effect in epitaxial ferroelectric film/manganite crystal heterostructures
Publisher: American Physical Society (APS)
Date: 17-04-2006
Tuning the Surface-Passivating Ligand Anchoring Position Enables Phase Robustness in CsPbI3 Perovskite Quantum Dot Solar Cells
Publisher: American Chemical Society (ACS)
Date: 24-09-2020
Ultrahigh rate capability and ultralong cycling stability of sodium-ion batteries enabled by wrinkled black titania nanosheets with abundant oxygen vacancies
Publisher: Elsevier BV
Date: 11-2018
Concurrent nonvolatile resistance and capacitance switching in LaAlO3
Publisher: AIP Publishing
Date: 28-02-2011
DOI: 10.1063/1.3560257
Abstract: We report on the correlated nonvolatile resistance and capacitance switching in Pt/LaAlO3/Nb:SrTiO3 heterostructures. The pristine devices show the typical characteristics of a Schottky junction however, after forming, a reverse bias switches the device into a low resistance and high capacitance state while a forward bias drives it into a high resistance and low capacitance state. Our experiments suggest that both the formation of conducting filaments and the modulation of interface barrier contribute to the resistance switching. Oxygen vacancies play critical roles in determining the switching characteristics and can be controlled in the process of device fabrication.
Toroidal Micelles of Polystyrene‐block‐Poly(acrylic acid)
Publisher: Wiley
Date: 17-08-2011
Electrical transport and magnetic properties of a possible electron-doped layered manganese oxide
Publisher: American Physical Society (APS)
Date: 02-2000
Light-Enhanced Spin Diffusion in Hybrid Perovskite Thin Films and Single Crystals.
Publisher: American Chemical Society (ACS)
Date: 20-12-2020
Abstract: Organolead trihalide perovskites have attracted substantial interest with regard to applications in charge-based photovoltaic and optoelectronic devices because of their low processing costs and remarkable light absorption and charge transport properties. Although spin is an intrinsic quantum descriptor of a particle and spintronics has been a central research theme in condensed matter physics, few studies have explored the spin degree of freedom in the emerging hybrid perovskites. Here, we report the characterization of a spin valve that uses hybrid perovskite films as the spin-transporting medium between two ferromagnetic electrodes. Because of the light-responsive nature of the hybrid perovskite, a high magnetoresistance of 97% and a large spin-diffusion length of 81 nm were achieved at 10 K under light illumination in polycrystalline films. Furthermore, by using thin perovskite single crystals, we discovered that the spin-diffusion length was able to reach 1 μm at low temperatures. Our results indicate that the spin relaxation is not significant as previously expected in such lead-containing materials and demonstrate the potential of low-temperature-processed hybrid perovskites as new active materials in spintronic devices.
Solution-Processed Mixed-Dimensional Hybrid Perovskite/Carbon Nanotube Electronics
Publisher: American Chemical Society (ACS)
Date: 02-03-2020
Universal Ferroelectric Switching Dynamics of Vinylidene Fluoride-trifluoroethylene Copolymer Films
Publisher: Springer Science and Business Media LLC
Date: 24-04-2014
DOI: 10.1038/SREP04772
One-Step Vapor-Phase Synthesis and Quantum-Confined Exciton in Single-Crystal Platelets of Hybrid Halide Perovskites
Publisher: American Chemical Society (ACS)
Date: 25-04-2019
DOI: 10.1021/ACS.JPCLETT.9B00777
Abstract: To investigate the quantum confinement effect on excitons in hybrid perovskites, single-crystal platelets of CH
Dye-sensitized solar cell with a pair of carbon-based electrodes
Publisher: IOP Publishing
Date: 02-04-2012
DOI: 10.1088/0022-3727/45/16/165103
Abstract: We have fabricated a dye-sensitized solar cell (DSSC) with a pair of carbon-based electrodes using a transparent, conductive carbon nanotubes (CNTs) film modified with ultra-thin titanium-sub-oxide (TiO x ) as the working electrode and a bilayer of conductive CNTs and carbon black as the counter electrode. Without TiO x modification, the DSSC is almost nonfunctional whereas the power conversion efficiency (PCE) increases significantly when the working electrode is modified with TiO x . The performance of the cell could be further improved when the carbon black film was added on the counter electrode. The improved efficiency can be attributed to the inhibition of the mass recombination at the working electrode/electrolyte interface by TiO x and the acceleration of the electron transfer kinetics at the counter electrode by carbon black. The DSSC with a pair of carbon-based electrodes gives the PCE of 1.37%.
Low symmetry monoclinic MC phase in epitaxial BiFeO3 thin films on LaSrAlO4 substrates
Publisher: AIP Publishing
Date: 13-12-2010
DOI: 10.1063/1.3525378
Abstract: We reported that the tetragonal-like phase identified in strained epitaxial BiFeO3 films on a (001) LaSrAlO4 single crystal substrates is monoclinic MC, based on high resolution synchrotron x-ray studies and piezoresponse force microscopy measurements. This MC phase has different symmetry with the rhombohedral-like monoclinic MA phase found in BiFeO3 films grown on low mismatch SrTiO3 substrates. Transmission electron microscopy revealed that the films on LaSrAlO4 substrates have a high crystalline quality and coherent interface.
Organic intercalation engineering of quasi-2D Dion–Jacobson α-CsPbI3 perovskites
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9MH01788G
Abstract: Organic intercalation engineering of perovskites endows the as-constructed quasi-2D Dion–Jacobson α-CsPbI 3 with a linearly aligned bandgap and fundamentally enhanced stability.
Overcoming the Ambient Manufacturability‐Scalability‐Performance Bottleneck in Colloidal Quantum Dot Photovoltaics
Publisher: Wiley
Date: 05-07-2018
Abstract: Colloidal quantum dot (CQD) solar cells have risen rapidly in performance however, their low-cost fabrication under realistic ambient conditions remains elusive. This study uncovers that humid environments curtail the power conversion efficiency (PCE) of solar cells by preventing the needed oxygen doping of the hole transporter during ambient fabrication. A simple oxygen-doping step enabling ambient manufacturing irrespective of seasonal humidity variations is devised. Solar cells with PCE > 10% are printed under high humidity at industrially viable speeds. The devices use a tiny fraction of the ink typically needed and are air stable over a year. The humidity-resilient fabrication of efficient CQD solar cells breaks a long-standing compromise, which should accelerate commercialization.
Nonvolatile Multistates Memories for High-Density Data Storage
Publisher: American Chemical Society (ACS)
Date: 19-08-2020
Photocurrent generation in lateral graphene p-n junction created by electron-beam irradiation
Publisher: Springer Science and Business Media LLC
Date: 08-07-2015
DOI: 10.1038/SREP12014
Abstract: Graphene has been considered as an attractive material for optoelectronic applications such as photodetectors owing to its extraordinary properties, e.g. broadband absorption and ultrahigh mobility. However, challenges still remain in fundamental and practical aspects of the conventional graphene photodetectors which normally rely on the photoconductive mode of operation which has the drawback of e.g. high dark current. Here, we demonstrated the photovoltaic mode operation in graphene p-n junctions fabricated by a simple but effective electron irradiation method that induces n-type doping in intrinsic p-type graphene. The physical mechanism of the junction formation is owing to the substrate gating effect caused by electron irradiation. Photoresponse was obtained for this type of photodetector because the photoexcited electron-hole pairs can be separated in the graphene p-n junction by the built-in potential. The fabricated graphene p-n junction photodetectors exhibit a high detectivity up to ~3 × 10 10 Jones (cm Hz 1/2 W −1 ) at room temperature, which is on a par with that of the traditional III–V photodetectors. The demonstrated novel and simple scheme for obtaining graphene p-n junctions can be used for other optoelectronic devices such as solar cells and be applied to other two dimensional materials based devices.
Nonvolatile Resistive Switching inPt / LaAlO 3
Publisher:
American Physical Society (APS)
Date:
12-12-2013
Publisher: American Physical Society (APS)
Date: 12-12-2013
Continuous-wave optically pumped green perovskite vertical-cavity surface-emitter
Publisher: The Optical Society
Date: 13-09-2017
DOI: 10.1364/OL.42.003618
Low‐Dimensional Metal‐Halide Perovskites as High‐Performance Materials for Memory Applications
Publisher: Wiley
Date: 21-08-2022
Abstract: Metal‐halide perovskites have drawn profuse attention during the past decade, owing to their excellent electrical and optical properties, facile synthesis, efficient energy conversion, and so on. Meanwhile, the development of information storage technologies and digital communications has fueled the demand for novel semiconductor materials. Low‐dimensional perovskites have offered a new force to propel the developments of the memory field due to the excellent physical and electrical properties associated with the reduced dimensionality. In this review, the mechanisms, properties, as well as stability and performance of low‐dimensional perovskite memories, involving both molecular‐level perovskites and structure‐level nanostructures, are comprehensively reviewed. The property–performance correlation is discussed in‐depth, aiming to present effective strategies for designing memory devices based on this new class of high‐performance materials. Finally, the existing challenges and future opportunities are presented.
Manganite thin film/ZnO nanowire (nanosheets) p-n junctions
Publisher: AIP Publishing
Date: 10-03-2008
DOI: 10.1063/1.2896307
Abstract: We have fabricated p-type La0.7Sr0.3MnO3 thin film/n-type ZnO nanowires (nanosheets) heterostructures. A lower-temperature growth with Zn source and a higher-temperature growth with ZnO/graphite source led to the formations of nanowires and nanosheets, respectively. While the nanosheets showed an epitaxial relationship with the manganite film, the high processing temperature resulted in interfacial diffusion and reaction, which were reflected in the x-ray diffraction, magnetic, and electrical transport measurements. The manganite thin film/ZnO nanowires (nanosheets) p-n junctions exhibited good rectification behaviors. Such heterostructures are promising to find potential applications in electronic and spintronic devices.
Strong Exciton–Photon Coupling and Lasing Behavior in All-Inorganic CsPbBr3 Micro/Nanowire Fabry-Pérot Cavity
Publisher: American Chemical Society (ACS)
Date: 13-03-2018
Solution-processed resistive switching memory devices based on hybrid organic–inorganic materials and composites
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8CP03945C
Abstract: We review emerging low-cost solution-processed resistive random-access memory (ReRAM) made of either hybrid nanocomposites or hybrid organo-lead halide perovskites.
Effect of annealing on the temperature-dependent dielectric properties of LaAlO3 at terahertz frequencies
Publisher: AIP Publishing
Date: 13-01-2012
DOI: 10.1063/1.3679725
Abstract: We present THz conductivity of LaAlO3 (LAO) as a function of temperature and annealing, using terahertz time-domain spectroscopy (THz-TDS). We observed that, after annealing, spectral weight redistribution occurs, such that the real conductivity σ1(ω) changed from a featureless and almost frequency-independent spectrum, into one where peaks occur near the phonon frequencies. These phonon frequencies increase with increasing temperature. We attribute the appearance of these absorption peaks to the diffusion and relocation of oxygen vacancies. The dielectric functions of annealed LAO are well fitted with the Drude-Lorentz model.
Photoluminescence characteristics of high quality ZnO nanowires and its enhancement by polymer covering
Publisher: AIP Publishing
Date: 11-01-2010
DOI: 10.1063/1.3291106
Abstract: We investigated the photoluminescence (PL) properties of ZnO nanowires with and without covering with polymethyl methacrylate (PMMA). Low temperature PL spectra of as-grown ZnO nanowires are dominated by near band edge (NBE) emission due to donor bound excitons and free-to-bound recombination (FB). FB emission persists till 300 K and together with free exciton emission governs the lineshape of the PL spectra. After covering with PMMA, the integral intensity of NBE emission increases about three times, indicating significantly improved excitonic emission efficiency. A model based on surface states and energy bands theory was proposed to interpret this emission enhancement.
Dominant Factor Determining the Conduction-Type of Nitrogen-Doped ZnO Film
Publisher: American Scientific Publishers
Date: 05-2014
Abstract: Nitrogen-doped zinc oxide (ZnO) film has been grown by molecular beam epitaxy. The as-grown s le showed p-type conduction with a hole concentration of 3.1 x 10(17) cm(-3). After an annealing process in O2 at 600 degrees C for 30 min, p-type conduction was still remained, and the hole concentration of the film decreased to 6.8 x 10(16) cm(-3). Secondary ion mass spectroscopy revealed that the concentration of both nitrogen and hydrogen decreased after the annealing process. It is demonstrated that the intrinsic compensation source has been decreased after the annealing process. Because the variation trend of the hole concentration in the ZnO:N film is opposite to that of hydrogen and intrinsic defects, but in good accordance with nitrogen, the extrinsically substituted nitrogen (N(o)) should be the dominant factor that determines the conduction-type of the ZnO:N film.
Spontaneous and stimulated emission of asymmetric double quantum wells
Publisher: Elsevier BV
Date: 11-2010
Are strain-induced effects truly strain induced? A comprehensive study of strained LCMO thin films
Publisher: AIP Publishing
Date: 04-05-2005
DOI: 10.1063/1.1845974
Abstract: We report results on strained La2∕3Ca1∕3MnO3 (LCMO) films that are able to distinguish between true strain effects and effects due simply to the reduced film thickness. Biaxially strained LCMO films were grown on SrTiO3, NdGaO3, and LaAlO3. The films on SrTiO3 and LaAlO3 are elastically strained and those on NdGaO3 are only slightly strained. We observe that both the saturation moment (Msat) and the Curie temperature (TC) are suppressed as the films become thinner, regardless of the strain. Thus, the decrease in Msat and TC is due to the two-dimensional nature of the films and not the strain.
Motion of Micrometer Sized Spherical Particles Exposed to a Transient Radial Flow: Attraction, Repulsion, and Rotation
Publisher: American Physical Society (APS)
Date: 12-08-2011
Giant Optical Anisotropy of Perovskite Nanowire Array Films
Publisher: Wiley
Date: 19-02-2020
Wavelength-Tuned Light Emission via Modifying the Band Edge Symmetry: Doped SnO2 as an Example
Publisher: American Chemical Society (ACS)
Date: 14-03-2014
DOI: 10.1021/JP411128M
Random lasing action of randomly assembled ZnO Nanowires with MgO coating
Publisher: Optica Publishing Group
Date: 10-06-2010
DOI: 10.1364/OE.18.013647
Manganite/Cuprate Superlattice as Artificial Reentrant Spin Glass
Publisher: Wiley
Date: 04-05-2016
Synthesis of single-crystal-like nanoporous carbon membranes and their application in overall water splitting
Publisher: Springer Science and Business Media LLC
Date: 04-01-2017
DOI: 10.1038/NCOMMS13592
Abstract: Nanoporous graphitic carbon membranes with defined chemical composition and pore architecture are novel nanomaterials that are actively pursued. Compared with easy-to-make porous carbon powders that dominate the porous carbon research and applications in energy generation/conversion and environmental remediation, porous carbon membranes are synthetically more challenging though rather appealing from an application perspective due to their structural integrity, interconnectivity and purity. Here we report a simple bottom–up approach to fabricate large-size, freestanding and porous carbon membranes that feature an unusual single-crystal-like graphitic order and hierarchical pore architecture plus favourable nitrogen doping. When loaded with cobalt nanoparticles, such carbon membranes serve as high-performance carbon-based non-noble metal electrocatalyst for overall water splitting.
Hydrazine-hydrothermal method to synthesize three-dimensional chalcogenide framework for photocatalytic hydrogen generation
Publisher: Elsevier BV
Date: 11-2010
Positive magnetoresistance in ferromagnetic Nd-doped In2O3 thin films grown by pulse laser deposition
Publisher: AIP Publishing
Date: 19-05-2014
DOI: 10.1063/1.4879463
Formation of DY center as n-type limiting defects in octahedral semiconductors: the case of Bi-doped hybrid halide perovskites
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8TC06222F
Abstract: As the DX center in tetrahedral semiconductors, we show that the DY center is an n-type limiting defect in octahedral semiconductors.
Rayleigh-instability-driven simultaneous morphological and compositional transformation from Co nanowires to CoO octahedra
Publisher: AIP Publishing
Date: 15-11-2010
DOI: 10.1063/1.3518470
Abstract: Arrays of regularly distributed CoO nano-octahedra are obtained by annealing Co nanowires at high temperatures. Both the size and the separation distance of the nano-octahedra can be controlled by tuning the annealing temperature. These self-assembled linear arrays of CoO nanocrystals result from the synergetic combination of the morphological transformation due to the intrinsic Rayleigh instability and the phase transformation due to the cobalt oxidation.
Coupled Current Jumps and Domain Wall Creeps in a Defect‐Engineered Ferroelectric Resistive Memory
Publisher: Wiley
Date: 30-12-2021
Abstract: Ferroelectric (FE) resistive switching has attracted considerable interest as a promising candidate for applications in non‐volatile memory technology. In this work, via judiciously controlling the defect states of oxygen vacancy through Sm‐doping, the authors obtain multiple current jumps/discrete resistance states in the resistive switching memories based on a model FE BiFeO 3 (BFO). These hitherto unreported current jumps are attributed to the space‐charge‐limited current correlated with electron trapping by oxygen vacancies in the BFO film. Concurrently, oxygen vacancies serve as the pinning centers for the FE domains, leading to the domain wall creep behavior. These results illustrate the strong interplay between the defect, resistive switching, and domain wall creep behavior in FE diodes, providing a new insight into the mechanism of FE resistive switching. Overall, the large on/off ratio of ≈5 × 10 5 , multiple resistance states, and fast switching speed of ≈30 ns, promise their potential applications in multi‐level data storage memories.
Formamidinium Lead Halide Perovskite Crystals with Unprecedented Long Carrier Dynamics and Diffusion Length
Publisher: American Chemical Society (ACS)
Date: 19-04-2016
Advances on Emerging Materials for Flexible Supercapacitors: Current Trends and Beyond
Publisher: Wiley
Date: 09-08-2020
Highly flexible and robust N-doped SiC nanoneedle field emitters
Publisher: Springer Science and Business Media LLC
Date: 2015
DOI: 10.1038/AM.2014.126
Influence of thin metal nanolayers on the photodetective properties of ZnO thin films
Publisher: AIP Publishing
Date: 15-10-2009
DOI: 10.1063/1.3251370
Abstract: We investigate the photoconductivity properties of ZnO thin films prepared by pulsed laser deposition with and without metals (Au or Pt) on the surface. The covering of nanostructured metals can largely enhance the photocurrent. Meanwhile, the dark currents have been increased significantly due to the increase in carrier concentration and mobility near the surface of ZnO thin film. Although plasmonic effect was observed by the photoluminescence enhancement, the main mechanism of the increase in the dark current and photoresponsivity for ZnO photoconductors has been interpreted by surface states, interface states, and persistent photoconductivity.
Perovskite Oxide SrTiO3 as an Efficient Electron Transporter for Hybrid Perovskite Solar Cells
Publisher: American Chemical Society (ACS)
Date: 02-12-2014
DOI: 10.1021/JP509753P
Phase segregation in inorganic mixed-halide perovskites
Publisher: Optica Publishing Group
Date: 30-10-2020
DOI: 10.1364/PRJ.402411
Abstract: Halide perovskites, such as methylammonium lead halide perovskites ( MAPbX 3 , X = I , Br, and Cl), are emerging as promising candidates for a wide range of optoelectronic applications, including solar cells, light-emitting diodes, and photodetectors, due to their superior optoelectronic properties. All-inorganic lead halide perovskites CsPbX 3 are attracting a lot of attention because replacing the organic cations with Cs + enhances the stability, and its halide-mixing derivatives offer broad bandgap tunability covering nearly the entire visible spectrum. However, there is evidence suggesting that the optical properties of mixed-halide perovskites are influenced by phase segregation under external stimuli, especially illumination, which may negatively impact the performance of optoelectronic devices. It is reported that the mixed-halide perovskites in forms of thin films and nanocrystals are segregated into a low-bandgap I-rich phase and a high-bandgap Br-rich phase. Herein, we present a critical review on the synthesis and basic properties of all-inorganic perovskites, phase-segregation phenomena, plausible mechanisms, and methods to mitigate phase segregation, providing insights on advancing mixed-halide perovskite optoelectronics with reliable performance.
Oxide nanowires for spintronics: materials and devices
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2NR11767C
Abstract: Spintronics, or spin-based data storage and manipulation technology, is emerging as a very active research area because of both new science and potential technological applications. As the characteristic lengths of spin-related phenomena naturally fall into the nanometre regime, researchers start applying the techniques of bottom-up nanomaterial synthesis and assembly to spintronics. It is envisaged that novel physics regarding spin manipulation and domain dynamics can be realized in quantum confined nanowire-based devices. Here we review the recent breakthroughs related to the applications of oxide nanowires in spintronics from the perspectives of both material candidates and device fabrication. Oxide nanowires generally show excellent crystalline quality and tunable physical properties, but more efforts are imperative as we strive to develop novel spintronic nanowires and devices.
Intercorrelated In-Plane and Out-of-Plane Ferroelectricity in Ultrathin Two-Dimensional Layered Semiconductor In
Publisher: American Chemical Society (ACS)
Date: 05-02-2018
DOI: 10.1021/ACS.NANOLETT.7B04852
Abstract: Enriching the functionality of ferroelectric materials with visible-light sensitivity and multiaxial switching capability would open up new opportunities for their applications in advanced information storage with erse signal manipulation functions. We report experimental observations of robust intralayer ferroelectricity in two-dimensional (2D) van der Waals layered α-In
Ultra-sensitive and wide-dynamic-range sensors based on dense arrays of carbon nanotube tips
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1NR10899A
Abstract: Electrochemical electrodes based on dense and vertically aligned arrays of multi-walled carbon nanotubes (MWCNTs) were produced. The open tips of in idual hollow nanotubes are exposed as active sites while the entangled nanotube stems encapsulated in epoxy collectively provide multiplexed and highly conductive pathways for charge transport. This unique structure together with the extraordinary electrical and electrochemical properties of MWCNTs offers a high signal-to-noise ratio (thus high sensitivity) and a large detection range, compared with other carbon-based electrodes. Our electrodes can detect K(3)FeCN(6) and dopamine at concentrations as low as 5 nM and 10 nM, respectively, and are responsive in a large dynamic range that spans almost 5 orders of magnitude.
Density‐Controlled Synthesis of Uniform ZnO Nanowires: Wide‐Range Tunability and Growth Regime Transition
Publisher: Wiley
Date: 29-01-2013
Fabrication and properties of B–N codoped p-type ZnO thin films
Publisher: IOP Publishing
Date: 25-02-2009
Defect-induced magnetism in undoped wide band gap oxides: Zinc vacancies in ZnO as an example
Publisher: AIP Publishing
Date: 06-2011
DOI: 10.1063/1.3609964
Abstract: To shed light on the mechanism responsible for the weak ferromagnetism in undoped wide band gap oxides, we carry out a comparative study on ZnO thin films prepared using both sol-gel and molecular beam epitaxy (MBE) methods. Compared with the MBE s les, the sol-gel derived s les show much stronger room temperature ferromagnetism with a magnetic signal persisting up to ∼740 K, and this ferromagnetic order coexists with a high density of defects in the form of zinc vacancies. The donor-acceptor pairs associated with the zinc vacancies also cause a characteristic orange-red photoluminescence in the sol-gel films. Furthermore, the strong correlation between the ferromagnetism and the zinc vacancies is confirmed by our first-principles density functional theory calculations, and electronic band alteration as a result of defect engineering is proposed to play the critical role in stabilizing the long-range ferromagnetism.
Corrigendum to “Bridging NiCo layered double hydroxides and Ni3S2 for bifunctional electrocatalysts: The role of vertical graphene” [Chem. Eng. J. 415 (2021) 129048](S1385894721006392)(10.1016/j.cej.2021.129048)
Publisher: Elsevier BV
Date: 08-2021
Two-Dimensional Electron Gas at the Spinel/Perovskite Interface: Suppression of Polar Catastrophe by an Ultrathin Layer of Interfacial Defects
Publisher: American Chemical Society (ACS)
Date: 24-08-2020
Electrode Engineering in Halide Perovskite Electronics: Plenty of Room at the Interfaces
Publisher: Wiley
Date: 11-03-2022
Abstract: Contact engineering is a prerequisite for achieving desirable functionality and performance of semiconductor electronics, which is particularly critical for organic–inorganic hybrid halide perovskites due to their ionic nature and highly reactive interfaces. Although the interfaces between perovskites and charge‐transporting layers have attracted lots of attention due to the photovoltaic and light‐emitting diode applications, achieving reliable perovskite/electrode contacts for electronic devices, such as transistors and memories, remains as a bottleneck. Herein, a critical review on the elusive nature of perovskite/electrode interfaces with a focus on the interfacial electrochemistry effects is presented. The basic guidelines of electrode selection are given for establishing non‐polarized interfaces and optimal energy level alignment for perovskite materials. Furthermore, state‐of‐the‐art strategies on interface‐related electrode engineering are reviewed and discussed, which aim at achieving ohmic transport and eliminating hysteresis in perovskite devices. The role and multiple functionalities of self‐assembled monolayers that offer a unique approach toward improving perovskite/electrode contacts are also discussed. The insights on electrode engineering pave the way to advancing stable and reliable perovskite devices in erse electronic applications.
Multiferroic oxide thin films and heterostructures
Publisher: AIP Publishing
Date: 26-05-2015
DOI: 10.1063/1.4921545
Abstract: Multiferroic materials promise a tantalizing perspective of novel applications in next-generation electronic, memory, and energy harvesting technologies, and at the same time they also represent a grand scientific challenge on understanding complex solid state systems with strong correlations between multiple degrees of freedom. In this review, we highlight the opportunities and obstacles in growing multiferroic thin films with chemical and structural integrity and integrating them in functional devices. Besides the magnetoelectric effect, multiferroics exhibit excellent resistant switching and photovoltaic properties, and there are plenty opportunities for them to integrate with other ferromagnetic and superconducting materials. The challenges include, but not limited, defect-related leakage in thin films, weak magnetism, and poor control on interface coupling. Although our focuses are Bi-based perovskites and rare earth manganites, the insights are also applicable to other multiferroic materials. We will also review some ex les of multiferroic applications in spintronics, memory, and photovoltaic devices.
A new hydrazine-bridged thioantimonate Mn2Sb4S8(N2H4)2: Synthesis, structure, optical and magnetic properties
Publisher: Elsevier BV
Date: 06-2011
Engineering magnetic domains in manganite thin films by laser interference
Publisher: AIP Publishing
Date: 02-01-2012
DOI: 10.1063/1.3673870
Abstract: We report on the laser interference (LI) aided conversion from maze-like to stripe-like magnetic domains in La1−xSrxMnO3 (x ∼ 0.3) thin films grown on LaAlO3 substrates. This conversion is attributed to the periodic, local, and rapid heating by LI which facilitates the reconfiguration of magnetic domains without damaging the film structures. By annealing the s le, the stripe-like domains can be converted back to the maze-like state. Our result represents a non-magnetic scheme for reversible magnetic domain engineering in ferromagnetic thin films.
Shape-Controlled Fabrication of Micro/Nanoscale Triangle, Square, Wire-like, and Hexagon Pits on Silicon Substrates Induced by Anisotropic Diffusion and Silicide Sublimation
Publisher: American Chemical Society (ACS)
Date: 20-04-2010
DOI: 10.1021/NN1000996
Abstract: We report the fabrication of micro/nanoscale pits with facile shape, orientation, and size controls on an Si surface via an Au-nanoparticles-assisted vapor transport method. The pit dimensions can be continuously tuned from 70 nm to several mum, and the shapes of triangles, squares, and wire/hexagons are prepared on Si (111), (100), and (110) substrates, respectively. This reliable shape control hinges on the anisotropic diffusivity of Co in Si and the sublimation of cobalt silicide nanoislands. The experimental conditions, in particular the substrate orientation and the growth temperature, dictate the pit morphology. On the basis of this understanding of the mechanism and the morphological evolution of the pits, we manage to estimate the diffusion coefficients of Co in bulk Si along the 100 and 111 directions, that is D(100) and D(111). These diffusion coefficients show strong temperature dependence, for ex le, D(100) is ca. 3 times larger than D(111) at 860 degrees C, while they approach almost the same value at 1000 degrees C. This simple bottom-up route may help to develop new technologies for Si-based nanofabrication and to find potential applications in constructing nanodevices.
From Titanium Sesquioxide to Titanium Dioxide: Oxidation-Induced Structural, Phase, and Property Evolution
Publisher: American Chemical Society (ACS)
Date: 15-06-2018
Quantum-Dot Tandem Solar Cells Based on a Solution-Processed Nanoparticle Intermediate Layer
Publisher: American Chemical Society (ACS)
Date: 16-12-2019
Abstract: Tandem cells are one of the most effective ways of breaking the single junction Shockley-Queisser limit. Solution-processable phosphate-buffered saline (PbS) quantum dots are good candidates for producing multiple junction solar cells because of their size-tunable band gap. The intermediate recombination layer (RL) connecting the subcells in a tandem solar cell is crucial for device performance because it determines the charge recombination efficiency and electrical resistance. In this work, a solution-processed ultrathin NiO and Ag nanoparticle film serves as an intermediate layer to enhance the charge recombination efficiency in PbS QD dual-junction tandem solar cells. The ch ion devices with device architecture of indium tin oxide/S-ZnO/1.45 eV PbS-PbI
Bandgap engineering of Cu2CdxZn1−xSnS4 alloy for photovoltaic applications: A complementary experimental and first-principles study
Publisher: AIP Publishing
Date: 11-11-2013
DOI: 10.1063/1.4829457
Abstract: We report on bandgap engineering of an emerging photovoltaic material of Cu2CdxZn1−xSnS4 (CCZTS) alloy. CCZTS alloy thin films with different Cd contents and single kesterite phase were fabricated using the sol-gel method. The optical absorption measurements indicate that the bandgap of the kesterite CCZTS alloy can be continuously tuned in a range of 1.55–1.09 eV as Cd content varied from x = 0 to 1. Hall effect measurements suggest that the hole concentration of CCZTS films decreases with increasing Cd content. The CCZTS-based solar cell with x = 0.47 demonstrates a power conversion efficiency of 1.2%. Our first-principles calculations based on the hybrid functional method demonstrate that the bandgap of the kesterite CCZTS alloy decreases monotonically with increasing Cd content, supporting the experimental results. Furthermore, Cu2ZnSnS4/Cu2CdSnS4 interface has a type-I band-alignment with a small valence-band offset, explaining the narrowing of the bandgap of CCZTS as the Cd content increases. Our results suggest that CCZTS alloy is a potentially suitable material to fabricate high-efficiency multi-junction tandem solar cells with different bandgap-tailored absorption layers.
Negative differential resistance in mesoscopic manganite structures
Publisher: AIP Publishing
Date: 13-06-2005
DOI: 10.1063/1.1946904
Abstract: Step-like negative differential resistance is observed in patterned Pr0.65(Ca0.75Sr0.25)0.35MnO3 structures with mesoscopic (micrometer) length scales. Key to the appearance of the steps is a field- and temperature-dependent mixture of ferromagnetic metal (FMM) and charge ordered insulating (COI) phases found in this material. Notably, such steps in the current-voltage curves have not been observed in bulk or unpatterned films of this material, suggesting that the commensurability between device dimensions and the size of competing FMM and COI domains are important conditions for observing this effect. We offer a semiquantitative resistor-network model of the steps that posits a local Joule heating-induced phase transition of FMM to COI.
Mechanism of Polarization Fatigue in BiFeO3
Publisher: American Chemical Society (ACS)
Date: 19-09-2012
DOI: 10.1021/NN303090K
Abstract: Fatigue in ferroelectric oxides has been a long lasting research topic since the development of ferroelectric memory in the late 1980s. Over the years, different models have been proposed to explain the fatigue phenomena. However, there is still debate on the roles of oxygen vacancies and injected charges. The main difficulty in the study of fatigue in ferroelectric films is that the conventional vertical sandwich structure prevents direct observation of the microscopic evolution through the film thickness during the electric field cycling. To circumvent this problem, we take advantage of the large in-plane polarization of BiFeO(3) and conduct direct domain and local electrical characterizations using a planar device structure. The combination of piezoresponse force microscopy and scanning kelvin probe microscopy allows us to study the local polarization and space charges simultaneously. It is observed that charged domain walls are formed during the electrical cycling, but they do not cause polarization fatigue. After prolonged cycling, injected charges appear at the electrode/film interfaces, where domains are pinned. When the pinned domains grow across the channel, macroscopic fatigue appears. The role of injected charges in polarization fatigue of BiFeO(3) is clearly demonstrated.
Ferroelectric Polarization Switching Dynamics and Domain Growth of Triglycine Sulfate and Imidazolium Perchlorate
Publisher: Wiley
Date: 08-04-2016
All-Solution-Processed Quantum Dot Electrical Double-Layer Transistors Enhanced by Surface Charges of Ti3C2Tx MXene Contacts
Publisher: American Chemical Society (ACS)
Date: 26-02-2021
Interface-dependent rectifying TbMnO3-based heterojunctions
Publisher: AIP Publishing
Date: 02-11-2011
DOI: 10.1063/1.3660322
Abstract: We report the fabrication and characterizations of oxide heterojunctions composed of TbMnO3 thin films grown on conducting Nb:SrTiO3 substrates. The heterojunctions exhibit rich rectifying characteristics, depending on not only the measurement temperature but also the growth temperature: at 300 K, good rectification appears in both s les at lower temperatures, the rectification is much smaller in the s le grown at 700 °C, whereas it exhibits a reversed bias dependence and reaches ∼5000 in the s le grown at 780 °C. Regarding to the transport mechanism, the conduction appears to be Schottky-emission-like at high temperatures in both junctions, indicating well-defined band alignment at interface on the other hand, the space-charge-limited mechanism dictates the low temperature transport. Furthermore, the temperature and frequency dependent capacitance-loss data suggest that the transport dynamics is associated with multiple thermally activated relaxation processes. Finally, transmission electron microscopy studies shed light on the crystalline quality of the junction interfaces, which is believed to dictate the corresponding transport properties.
Switching magnetoresistance in vertically interfaced Pr0.5Ca0.5MnO3 grown on ZnO nanowires
Publisher: AIP Publishing
Date: 05-09-2011
DOI: 10.1063/1.3627182
Halide perovskites
Publisher: Wiley
Date: 03-05-2021
Abstract: Organic–inorganic mixed halide perovskites have emerged as an excellent class of materials with a unique combination of optoelectronic properties, suitable for a plethora of applications ranging from solar cells to light‐emitting diodes and photoelectrochemical devices. Recent works have showcased hybrid perovskites for electronic applications through improvements in materials design, processing, and device stability. Herein, a comprehensive up‐to‐date review is presented on hybrid perovskite electronics with a focus on transistors and memories. These applications are supported by the fundamental material properties of hybrid perovskite semiconductors such as tunable bandgap, ambipolar charge transport, reasonable mobility, defect characteristics, and solution processability, which are highlighted first. Then, recent progresses on perovskite‐based transistors are reviewed, covering aspects of fabrication process, patterning techniques, contact engineering, 2D versus 3D material selection, and device performance. Furthermore, applications of perovskites in nonvolatile memories and artificial synaptic devices are presented. The ambient instability of hybrid perovskites and the strategies to tackle this bottleneck are also discussed. Finally, an outlook and opportunities to develop perovskite‐based electronics as a competitive and feasible technology are highlighted.
Characteristics of ultraviolet photoluminescence from high quality tin oxide nanowires
Publisher: AIP Publishing
Date: 10-08-2009
DOI: 10.1063/1.3205122
Abstract: We investigate the optical properties of ultraviolet range emission from high quality tin oxide nanowires prepared by vapor-liquid-solid growth technique. Temperature dependent photoluminescence (PL) measurement is performed between 10 and 300 K. At low temperatures, the PL originates from radiative recombination of excitons bound to neutral donors, donor-acceptor pair transition and their associated longitudinal optical (LO) phonon replicas. The LO-phonon replicas up to third order with Huang–Rhys factor of 0.34 are observed. Evolution of the peaks and the origin of PL thermal quenching at high temperatures are discussed in detail.
Fast Crystallization and Improved Stability of Perovskite Solar Cells with Zn2SnO4 Electron Transporting Layer: Interface Matters
Publisher: American Chemical Society (ACS)
Date: 15-12-2015
Abstract: Here we report that mesoporous ternary oxide Zn2SnO4 can significantly promotes the crystallization of hybrid perovskite layers and serves as an efficient electron transporting material in perovskite solar cells. Such devices exhibit an energy conversion efficiency of 13.34%, which is even higher than that achieved with the commonly used TiO2 in the similar experimental conditions (9.1%). Simple one-step spin coating of CH3NH3PbI3-xClx on Zn2SnO4 is found to lead to rapidly crystallized bilayer perovskite structure without any solvent engineering. Furthermore, ultrafast transient absorption measurement reveals efficient charge transfer at the Zn2SnO4 erovskite interface. Most importantly, solar cells with Zn2SnO4 as the electron-transporting material exhibit negligible electrical hysteresis and exceptionally high stability without encapsulation for over one month. Besides underscoring Zn2SnO4 as a highly promising electron transporting material for perovskite solar cells, our results demonstrate the significant role of interfaces on improving the perovskite crystallization and photovoltaic performance.
Microwave synthesis and high-mobility charge transport of carbon-nanotube-in-perovskite single crystals
Publisher: Wiley
Date: 29-10-2020
Flexible and efficient perovskite quantum dot solar cells via hybrid interfacial architecture
Publisher: Springer Science and Business Media LLC
Date: 20-01-2021
DOI: 10.1038/S41467-020-20749-1
Abstract: All-inorganic CsPbI 3 perovskite quantum dots have received substantial research interest for photovoltaic applications because of higher efficiency compared to solar cells using other quantum dots materials and the various exciting properties that perovskites have to offer. These quantum dot devices also exhibit good mechanical stability amongst various thin-film photovoltaic technologies. We demonstrate higher mechanical endurance of quantum dot films compared to bulk thin film and highlight the importance of further research on high-performance and flexible optoelectronic devices using nanoscale grains as an advantage. Specifically, we develop a hybrid interfacial architecture consisting of CsPbI 3 quantum dot/PCBM heterojunction, enabling an energy cascade for efficient charge transfer and mechanical adhesion. The ch ion CsPbI 3 quantum dot solar cell has an efficiency of 15.1% (stabilized power output of 14.61%), which is among the highest report to date. Building on this strategy, we further demonstrate a highest efficiency of 12.3% in flexible quantum dot photovoltaics.
Evolution of the SrTiO3–MoO3 Interface Electronic Structure: An in Situ Photoelectron Spectroscopy Study
Publisher: American Chemical Society (ACS)
Date: 21-05-2015
Abstract: Modifying the surface energetics, particularly the work function of advanced materials, is of critical importance for a wide range of surface- and interface-based devices. In this work, using in situ photoelectron spectroscopy, we investigated the evolution of electronic structure at the SrTiO3 surface during the growth of ultra-thin MoO3 layers. Because of the large work function difference between SrTiO3 and MoO3, the energy band alignment on the SrTiO3 surface is significantly modified. The charge transfer and dipole formation at the SrTiO3-MoO3 interface leads to a large modulation of work function and to apparent doping in SrTiO3. The measured evolutions of electronic structure and upward band bending suggest that the growth of ultra-thin MoO3 layers is a powerful tool with which to modulate the surface energetics of SrTiO3, and this surface engineering approach could be generalized to other functional oxides.
First‐Principles Optimization of Out‐of‐Plane Charge Transport in Dion–Jacobson CsPbI3 Perovskites with π‐Conjugated Aromatic Spacers
Publisher: Wiley
Date: 02-05-2021
Abstract: Quasi‐2D CsPbI 3 perovskites have emerged as excellent candidates for advanced photovoltaic technologies due to their fundamentally enhanced stability than conventional 3D counterparts. However, the applications of quasi‐2D perovskites are plagued with their poor out‐of‐plane carrier mobility induced by the intercalated insulating organic layers. In this work, a new strategy is explored to significantly enhance the out‐of‐plane charge transport in quasi‐2D Dion–Jacobson (DJ) CsPbI 3 perovskites via leveraging the intercalation of aromatic diamine cations ( p ‐phenylenediamine, PPDA) with unique π‐conjugated bond based on the first‐principles calculations. The strong interactions between PPDA 2+ cations and inorganic Pb‐I framework (i.e., I–I interaction, p ‐π coupling, and H‐bonds) provide three carrier pathways to facilitate the out‐of‐plane charge transport. Furthermore, the restricted in‐plane and out‐of‐plane structural distortion induced by the π‐conjugated bond could improve the electronic coupling and charge mobility along the out‐of‐plane direction with reduced bandgaps. As a proof of concept, the calculated average photovoltaic conversion efficiency of such engineered DJ CsPbI 3 perovskite solar cells is ≈17%, which is very close to the certificated ch ion efficiency of 3D α‐CsPbI 3 , underscoring their potential for solar cell applications.
Investigation of the conversion mechanism of nanosized CoF2
Publisher: Elsevier BV
Date: 09-2013
Defects-Mediated Energy Transfer in Red-Light-Emitting Eu-Doped ZnO Nanowire Arrays
Publisher: American Chemical Society (ACS)
Date: 02-11-2011
DOI: 10.1021/JP204572V
Exchange coupling and coercivity enhancement in cuprate/manganite bilayers
Publisher: AIP Publishing
Date: 21-01-2013
DOI: 10.1063/1.4788719
Abstract: We report on the magnetic properties of cuprate/manganite bilayers composed of antiferromagnetic (AFM) La2CuO4 and ferromagnetic La0.70Sr0.30MnO3. The temperature dependent magnetization data indicate an interfacial spin-glass state. Furthermore, the bilayer exhibits significant enhancement of coercivity compared to the La0.70Sr0.30MnO3 single layer and reaches 705 Oe at 5 K. The dependence of coercivity on the AFM layer thickness indicates that the enhancement cannot be explained by the interfacial charge diffusion. Our results suggest that the exchange coupling between Mn and Cu spins and the magnetic frustration at the La2CuO4/La0.70Sr0.30MnO3 interface must be considered to harness the properties of cuprate/manganite heterostructures.
Morphology-Tailored Halide Perovskite Platelets and Wires: From Synthesis, Properties to Optoelectronic Devices
Publisher: Wiley
Date: 03-07-2018
A facile approach to tailor electrocatalytic properties of MnO2 through tuning phase transition, surface morphology and band structure
Publisher: Elsevier BV
Date: 06-2022
Uniaxial tensile strain and exciton–phonon coupling in bent ZnO nanowires
Publisher: AIP Publishing
Date: 13-06-2011
DOI: 10.1063/1.3601479
Abstract: We investigate the optical property of bent ZnO nanowires (NWs) obtained by low energy argon ion milling. At room temperature, the bent NWs demonstrates an enhanced near band edge ultraviolet emission, while the deep level green emission is totally suppressed. Temperature dependent photoluminescence measurements were carried out between 10 and 300 K for both the as-grown and the bent ZnO NWs. It is found that the emission peak energy of the bent NWs systematically shifts to lower energy compared to the as-grown NWs in the whole measured temperature range. Our results indicate that the redshift in the emission peak is related to the uniaxial tensile strain and the enhanced exciton–phonon coupling strength in the bent ZnO NWs.
Si substrate controlled in-plane synthesis of self-assembled nanostructures catalyzed by Au nanoparticles
Publisher: IEEE
Date: 2010
One-pot solution growth of 2D/3D perovskite crystalline lateral heterostructures
Publisher: Research Square Platform LLC
Date: 06-04-2022
DOI: 10.21203/RS.3.RS-1495375/V1
Abstract: Halide perovskites, due to their remarkable characteristics including high absorption coefficients, tunable bandgaps, superior carrier dynamics, as well as solution-processed procedures, have demonstrated huge potential in next-generation device applications. Creating perovskite heterostructures, featuring the spatial modulation of structural, electronic, and optical properties, is expected to further boost device performance and may even open up new realms however, direct growth of mixed-dimensional lateral heterostructures remains a significant challenge. Here we present a one-pot solution synthesis of two-/three-dimensional (2D/3D) crystalline perovskite lateral heterostructures, leveraging on their different temperature-dependent solubilities. Various types of heterostructures are demonstrated with well-defined interfaces and negligible ion diffusion, exhibiting clear structural and optical modulations. The resultant photodiodes yield a low dark current less than 0.1 nA and a detectivity exceeding 1013 Jones (much higher than those made of 2D or 3D thin crystals). The facile growth of such lateral crystalline perovskite heterostructures underscores a significant advance and opens up new opportunities for advanced perovskite optoelectronics.
P‐Type SnO Thin Film Phototransistor with Perovskite‐Mediated Photogating
Publisher: Wiley
Date: 27-09-2018
Uniaxial Magnetic Anisotropy in La0.7Sr0.3MnO3 Thin Films Induced by Multiferroic BiFeO3 with Striped Ferroelectric Domains
Publisher: Wiley
Date: 20-08-2010
Colossal X‐Ray‐Induced Persistent Photoconductivity in Current‐Perpendicular‐to‐Plane Ferroelectric/Semiconductor Junctions
Publisher: Wiley
Date: 07-12-2017
Emerging Chalcohalide Materials for Energy Applications
Publisher: American Chemical Society (ACS)
Date: 21-11-2022
DOI: 10.1021/ACS.CHEMREV.2C00422
Abstract: Semiconductors with multiple anions currently provide a new materials platform from which improved functionality emerges, posing new challenges and opportunities in material science. This review has endeavored to emphasize the versatility of the emerging family of semiconductors consisting of mixed chalcogen and halogen anions, known as "chalcohalides". As they are multifunctional, these materials are of general interest to the wider research community, ranging from theoretical/computational scientists to experimental materials scientists. This review provides a comprehensive overview of the development of emerging Bi- and Sb-based as well as a new Cu, Sn, Pb, Ag, and hybrid organic-inorganic perovskite-based chalcohalides. We first highlight the high-throughput computational techniques to design and develop these chalcohalide materials. We then proceed to discuss their optoelectronic properties, band structures, stability, and structural chemistry employing theoretical and experimental underpinning toward high-performance devices. Next, we present an overview of recent advancements in the synthesis and their wide range of applications in energy conversion and storage devices. Finally, we conclude the review by outlining the impediments and important aspects in this field as well as offering perspectives on future research directions to further promote the development of chalcohalide materials in practical applications in the future.
Performance degradation and mitigation strategies of silver nanowire networks: a review
Publisher: Informa UK Limited
Date: 13-07-2022
Auger-type Hole Trapping Process at Green Emission Centers of ZnO Nanowires
Publisher: OSA
Date: 2013
Nanoscale semiconductor–insulator–metal core/shell heterostructures: facile synthesis and light emission
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1NR10352K
Abstract: Controllably constructing hierarchical nanostructures with distinct components and designed architectures is an important theme of research in nanoscience, entailing novel but reliable approaches of bottom-up synthesis. Here, we report a facile method to reproducibly create semiconductor-insulator-metal core/shell nanostructures, which involves first coating uniform MgO shells onto metal oxide nanostructures in solution and then decorating them with Au nanoparticles. The semiconductor nanowire core can be almost any material and, herein, ZnO, SnO(2) and In(2)O(3) are used as ex les. We also show that linear chains of short ZnO nanorods embedded in MgO nanotubes and porous MgO nanotubes can be obtained by taking advantage of the reduced thermal stability of the ZnO core. Furthermore, after MgO shell-coating and the appropriate annealing treatment, the intensity of the ZnO near-band-edge UV emission becomes much stronger, showing a 25-fold enhancement. The intensity ratio of the UV/visible emission can be increased further by decorating the surface of the ZnO/MgO nanowires with high-density plasmonic Au nanoparticles. These heterostructured semiconductor-insulator-metal nanowires with tailored morphologies and enhanced functionalities have great potential for use as nanoscale building blocks in photonic and electronic applications.
Confinement-Induced Giant Spin–Orbit-Coupled Magnetic Moment of Co Nanoclusters in TiO2 Films
Publisher: American Chemical Society (ACS)
Date: 29-10-2019
Abstract: High magnetization materials are in great demand for the fabrication of advanced multifunctional magnetic devices. Notwithstanding this demand, the development of new materials with these attributes has been relatively slow. In this work, we propose a new strategy to achieve high magnetic moments above room temperature. Our material engineering approach invoked the embedding of magnetic nanoclusters in an oxide matrix. By precisely controlling pulsed laser deposition parameters, Co nanoclusters are formed in a 5 at % Co-TiO
High‐Performance Photothermal Conversion of Narrow‐Bandgap Ti2O3 Nanoparticles
Publisher: Wiley
Date: 11-11-2016
Abstract: Ti
Facile Patterning of Silver Nanowires with Controlled Polarities via Inkjet-Assisted Manipulation of Interface Adhesion
Publisher: American Chemical Society (ACS)
Date: 09-07-2020
The Role of Surface Tension in the Crystallization of Metal Halide Perovskites
Publisher: American Chemical Society (ACS)
Date: 18-07-2017
Tuning ferromagnetism in MgxZn1−xO thin films by band gap and defect engineering
Publisher: AIP Publishing
Date: 06-09-2010
DOI: 10.1063/1.3485058
Abstract: We investigate the room temperature ferromagnetism in band gap tunable MgxZn1−xO (x≤0.22) alloy thin films and find that ferromagnetism is significantly enhanced in p-type MgxZn1−xO (x≥0.17) compared with the n-type counterparts (x≤0.15). Temperature-dependent photoluminescence measurements reveal the correlation between the p-type behavior, enhanced ferromagnetism, and zinc vacancies. First-principle calculations demonstrate that the formation energy of zinc vacancies decreases with the increasing Mg content and the zinc vacancies in MgxZn1−xO alloys stabilize the ferromagnetic coupling. Our results suggest a viable route to tune the magnetic properties of oxides through band gap and defect engineering.
Ferroelectric Polarization Rotation in Order-Disorder-Type LiNbO
Publisher: American Chemical Society (ACS)
Date: 08-11-2018
Abstract: The direction of ferroelectric polarization is prescribed by the symmetry of the crystal structure. Therefore, rotation of the polarization direction is largely limited, despite the opportunity it offers in understanding important dielectric phenomena such as piezoelectric response near the morphotropic phase boundaries and practical applications such as ferroelectric memory. In this study, we report the observation of continuous rotation of ferroelectric polarization in order-disorder-type LiNbO
Top-illuminated dye-sensitized solar cells with a room-temperature-processed ZnO photoanode on metal substrates and a Pt-coated Ga-doped ZnO counter electrode
Publisher: IOP Publishing
Date: 11-01-2011
DOI: 10.1088/0022-3727/44/4/045102
Abstract: We report on top-illuminated, fluorine tin oxide/indium tin oxide-free (FTO/ITO-free), dye-sensitized solar cells (DSCs) using room-temperature-processed ZnO layers on metal substrates as the working electrodes and Pt-coated Ga-doped ZnO layers (GZO) as the counter electrodes. These top-illuminated DSCs with GZO render comparable efficiency to those employing commercial FTO counter electrodes. Despite a lower current density, the top-illuminated DSCs result in a higher fill factor than conventional DSCs due to a low ohmic loss at the electrode/semiconductor interface. The effect of metal substrate on the performance of the resulting top-illuminated DSCs is also studied by employing various metals with different work functions. Ti is shown to be a suitable metal to be used as the working electrode in the top-illuminated device architecture owing to its low ohmic loss at the electrode/semiconductor interface, minimum catalytic activity on redox reactions and high resistance to corrosion by liquid electrolytes.
Tuning magnetoresistance and exchange coupling in ZnO by doping transition metals
Publisher: AIP Publishing
Date: 28-11-2011
DOI: 10.1063/1.3664116
Anisotropic magnetoresistance and weak spin-orbital coupling in doped ZnO thin films
Publisher: AIP Publishing
Date: 30-01-2012
DOI: 10.1063/1.3681795
Abstract: Both out-of-plane and in-plane anisotropic magnetoresistance (AMR) of Cu-doped ZnO thin films with different crystalline orientations are studied. Comparative data of angular dependent AMR suggest that the out-of-plane AMR comes from the geometric effect, while the in-plane AMR can be attributed to the field-dependent path-length effect. Moreover, the small magnitude of AMR and the negligible magnetocrystalline anisotropy suggest that the spin-orbit coupling in Cu-doped ZnO is relatively weak.
Indigo: A Natural Molecular Passivator for Efficient Perovskite Solar Cells
Publisher: Wiley
Date: 22-04-2022
Abstract: Organic–inorganic hybrid lead halide perovskite solar cells have made unprecedented progress in improving photovoltaic efficiency during the past decade, while still facing critical stability challenges. Herein, the natural organic dye Indigo is explored for the first time to be an efficient molecular passivator that assists in the preparation of high‐quality hybrid perovskite film with reduced defects and enhanced stability. The Indigo molecule with both carbonyl and amino groups can provide bifunctional chemical passivation for defects. In‐depth theoretical and experimental studies show that the Indigo molecules firmly binds to the perovskite surfaces, enhancing the crystallization of perovskite films with improved morphology. Consequently, the Indigo‐passivated perovskite film exhibits increased grain size with better uniformity, reduced grain boundaries, lowered defect density, and retarded ion migration, boosting the device efficiency up to 23.22%, and ≈21% for large‐area device (1 cm 2 ). Furthermore, the Indigo passivation can enhance device stability in terms of both humidity and thermal stress. These results provide not only new insights into the multipassivation role of natural organic dyes but also a simple and low‐cost strategy to prepare high‐quality hybrid perovskite films for optoelectronic applications based on Indigo derivatives.
Device Performance of the Mott InsulatorLaVO 3
Publisher:
American Physical Society (APS)
Date:
22-06-2015
Publisher: American Physical Society (APS)
Date: 22-06-2015
Controlling the Growth Mechanism of ZnO Nanowires by Selecting Catalysts
Publisher: American Chemical Society (ACS)
Date: 02-09-1970
DOI: 10.1021/JP075296A
Giant Humidity Effect on Hybrid Halide Perovskite Microstripes: Reversibility and Sensing Mechanism.
Publisher: American Chemical Society (ACS)
Date: 25-07-2019
Abstract: Despite the exceptional performance of hybrid perovskites in photovoltaics, their susceptibility to ambient factors, particularly humidity, gives rise to the well-recognized stability issue. In the present work, microstripes of CH
Novel approaches to field modulation of electronic and magnetic properties of oxides
Publisher: Informa UK Limited
Date: 03-2007
Ferromagnetism in Dilute Magnetic Semiconductors through Defect Engineering: Li-Doped ZnO
Publisher: American Physical Society (APS)
Date: 29-03-2010
Ultraviolet photovoltaic effect in BiFeO3/Nb-SrTiO3 heterostructure
Publisher: AIP Publishing
Date: 15-10-2012
DOI: 10.1063/1.4759049
Abstract: We report on ultraviolet photovoltaic effects in a BiFeO3/Nb-doped SrTiO3 heterostructure prepared by a pulsed laser deposition method. The heterostructure exhibits rectifying behaviors in the temperature range from 80 K to 300 K. The photovoltage of heterostructure is about 0.33 V at T = 80 K when it is illuminated by a KrF excimer laser with a wavelength of 248 nm. The peak photovoltages decrease with increasing the temperature because of the accumulation of photogenerated carriers. Moreover, the peak photovoltages of heterostructure almost linearly increase with an increase of the power density of laser at T = 300 K. The results reveal some properties that may be useful for possible applications in multiferroic photoelectric devices.
Polymer-Encapsulated Gold-Nanoparticle Dimers: Facile Preparation and Catalytical Application in Guided Growth of Dimeric ZnO-Nanowires
Publisher: American Chemical Society (ACS)
Date: 02-08-2008
DOI: 10.1021/NL080820Q
Abstract: Rational assembly of nanoparticles is of vital importance for exploring fundamental electronic and optical properties and for constructing novel nanoscale devices. Through controlling aggregation kinetics, dimers and trimers of gold nanoparticles were generated and encapsulated with polymer by using a one-pot synthesis that involved simple heating and cooling. Dimers of gold nanoparticles were enriched from the resulting solution by centrifugation. The polymer shells maintain the stability of the nanoparticle organization, preventing aggregation and disintegration during subsequent purification, enrichment, and application. A typical enriched s le showed that the dimer population reached 61% among 989 nanoparticles surveyed. In a proof-of-concept application, the gold nanoparticle dimers were used as catalyst to guide the growth of dimeric zinc oxide nanowires. Nanowire dimers with unprecedented narrow spacing (20 to 60 nm) were achieved using a vapor transport growth method dimeric nanowire population reached approximately 25%.
High-κ perovskite membranes as insulators for two-dimensional transistors
Publisher: Springer Science and Business Media LLC
Date: 11-05-2022
DOI: 10.1038/S41586-022-04588-2
Abstract: The scaling of silicon metal-oxide-semiconductor field-effect transistors has followed Moore's law for decades, but the physical thinning of silicon at sub-ten-nanometre technology nodes introduces issues such as leakage currents
Enhanced low field magnetoresistance in nanocrystalline La0.7Sr0.3MnO3 synthesized on MgO nanowires
Publisher: AIP Publishing
Date: 31-05-2010
DOI: 10.1063/1.3432113
Abstract: We report on the structure and transport properties of nanocrystalline manganite La0.7Sr0.3MnO3 (LSMO) synthesized on nanowires-engineered MgO substrates by pulsed laser deposition, which is compared with reference s les deposited directly on flat MgO substrates. Such LSMO/MgO nanocomposites show enhanced low field magnetoresistance, especially at low temperature, due to the dominant spin-polarized intergrain tunneling. This work suggests that growing on nanoengineered substrates is a viable route to achieve nanostructured materials with desired crystalline structure and physical properties.
Electrostatic tuning of Kondo effect in a rare-earth-doped wide-band-gap oxide
Publisher: American Physical Society (APS)
Date: 29-04-2013
Perovskite Quantum Dot Solar Cells Fabricated from Recycled Lead-Acid Battery Waste
Publisher: American Chemical Society (ACS)
Date: 06-12-2021
Ferroelectric Transistors with Nanowire Channel: Toward Nonvolatile Memory Applications
Publisher: American Chemical Society (ACS)
Date: 27-02-2009
DOI: 10.1021/NN800808S
Abstract: We report the fabrication and characterization of ZnO nanowire memory devices using a ferroelectric Pb(Zr(0.3)Ti(0.7))O(3) (PZT) film as the gate dielectric and the charge storage medium. With a comparison to nanowire transistors based on SiO(2) gate oxide, the devices were evaluated in terms of their electric transport, retention, and endurance performance. Memory effects are observed as characterized by an eminent counterclockwise loop in I-V(g) curves, which is attributed to the switchable remnant polarization of PZT. The single-nanowire device exhibits a high (up to 10(3)) on/off ratio at zero gate voltage. Our results give a proof-of-principle demonstration of the memory application based on a combination of nanowires (as channels) and ferroelectric films (as gate oxide).
Optically controlled electroabsorption modulators for unconstrained wavelength conversion
Publisher: AIP Publishing
Date: 21-01-2004
DOI: 10.1063/1.1643539
Abstract: We introduce a proof-of-concept, optically controlled, optical switch based on the monolithic integration of a surface-illuminated photodetector and a waveguide electroabsorption modulator. We demonstrate unconstrained wavelength conversion over the entire center telecommunication wavelength band (C band) and optical switching up to 2.5 Gbit/s with extinction ratios exceeding 10 dB. Our approach offers both high-speed, low-power, switching operation and two-dimensional array scalability for the fabrication of chip-scale reconfigurable multichannel wavelength converters.
Enhanced magnetoresistance in strain-free manganite network
Publisher: AIP Publishing
Date: 31-01-2005
DOI: 10.1063/1.1861493
Abstract: A network structure of a ferromagnetic metallic (FMM)∕charge-ordered insulator (COI) mixed phase manganite has been obtained by annealing a 150Å Pr0.65(Ca0.75Sr0.25)0.35MnO3 film under tensile strain on a SrTiO3 substrate. Under the same deposition and annealing conditions, a film deposited on a LaAlO3 substrate, which provides compressive strain, remains continuous. The network structure also manifests a larger magnetoresistance than the continuous film. It is suggested that the lateral confinement in this filamentary structure may affect the percolative transport in this mixed FMM∕COI system.
Magnetization steps in manganite films: Time delay of the metamagnetic transition
Publisher: American Physical Society (APS)
Date: 18-03-2004
All-inorganic perovskite nanocrystal scintillators
Publisher: Springer Science and Business Media LLC
Date: 27-08-2018
DOI: 10.1038/S41586-018-0451-1
Abstract: The rising demand for radiation detection materials in many applications has led to extensive research on scintillators
Tuning metal–carboxylate coordination in crystalline metal–organic frameworks through surfactant media
Publisher: Elsevier BV
Date: 10-2013
Self‐Assembled In‐Plane Growth of Mg2SiO4 Nanowires on Si Substrates Catalyzed by Au Nanoparticles
Publisher: Wiley
Date: 29-07-2010
Photoinduced modulation and relaxation characteristics in LaAlO3/SrTiO3 heterointerface
Publisher: Springer Science and Business Media LLC
Date: 05-03-2015
DOI: 10.1038/SREP08778
Abstract: We report the modulation and relaxation characteristics in the two-dimensional electron gas system at LaAlO 3 /SrTiO 3 heterointerface induced by the ultraviolet light illumination (365 nm). The suppression of Kondo effect at the interface illuminated by the light originates from the light irradiation-induced decoherence effect of localized states. It is interesting to note that the persistent and transient photoinduced effects are simultaneously observed and the photoinduced maximum change values in resistance are 80.8% and 51.4% at T = 20 K, respectively. Moreover, the photoinduced relaxation processes after the irradiation are systematically analyzed using the double exponential model. These results provide the deeper understanding of the photoinduced effect and the experimental evidence of tunable Kondo effect in oxides-based two-dimensional electron gas systems.
A Photodetector Based on p-Si/n-ZnO Nanotube Heterojunctions with High Ultraviolet Responsivity
Publisher: American Chemical Society (ACS)
Date: 16-10-2017
Abstract: Enhanced ultraviolet (UV) photodetectors (PDs) with high responsivity comparable to that of visible and infrared photodetectors are needed for commercial applications. n-Type ZnO nanotubes (NTs) with high-quality optical, structural, and electrical properties on a p-type Si(100) substrate are successfully fabricated by pulsed laser deposition (PLD) to produce a UV PD with high responsivity, for the first time. We measure the current-voltage characteristics of the device under dark and illuminated conditions and demonstrated the high stability and responsivity (that reaches ∼101.2 A W
Spin-polarized quasiparticle injection into YBCO
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-1999
DOI: 10.1109/77.783817
Emergent vortices at a ferromagnetic superconducting oxide interface
Publisher: IOP Publishing
Date: 09-10-2014
Synergistic effect of electron transport layer and colloidal quantum dot solid enable PbSe quantum dot solar cell achieving over 10 % efficiency
Publisher: Elsevier BV
Date: 10-2019
Insulator–metal transition and magnetoresistance of La0.5Ca0.5MnOy induced by tuning the oxygen content
Publisher: AIP Publishing
Date: 21-10-2002
DOI: 10.1063/1.1509108
Abstract: The oxygen content of La0.5Ca0.5MnOy was tuned by annealing the s les at high temperatures in flowing nitrogen with graphite powder nearby. The reduction of oxygen content has dramatic effect on the electrical transport and magnetic properties. The s les with y=2.983, 2.83, and 2.803 show an insulator–metal transition, and an unusual temperature and magnetic-field dependence of the magnetoresistance. The paramagnetic-ferromagnetic transition also shifts to lower temperatures and the antiferromagnetic transition at lower temperature is suppressed. The results are discussed in terms of the effect of oxygen vacancies on the various properties of La0.5Ca0.5MnOy.
Hybrid Block Copolymer/Perovskite Heterointerfaces for Efficient Solar Cells
Publisher: Wiley
Date: 23-11-2023
Abstract: Solution processable semiconductors like organics and emerging lead halide perovskites (LHPs) are ideal candidates for photovoltaics combining high performance and flexibility with reduced manufacturing cost. Moreover, the study of hybrid semiconductors would lead to advanced structures and deep understanding that will propel this field even further. Herein, a novel device architecture involving block copolymer erovskite hybrid bulk heterointerfaces is investigated, such a modification could enhance light absorption, create an energy level cascade, and provides a thin hydrophobic layer, thus enabling enhanced carrier generation, promoting energy transfer and preventing moisture invasion, respectively. The resulting hybrid block copolymer erovskite solar cell exhibits a ch ion efficiency of 24.07% for 0.0725 cm 2 ‐sized devices and 21.44% for 1 cm 2 ‐sized devices, respectively, together with enhanced stability, which is among the highest reports of organic erovskite hybrid devices. More importantly, this approach has been effectively extended to other LHPs with different chemical compositions like MAPbI 3 and CsPbI 3 , which may shed light on the design of highly efficient block copolymer erovskite hybrid materials and architectures that would overcome current limitations for realistic application exploration.
Ambipolar solution-processed hybrid perovskite phototransistors
Publisher: Springer Science and Business Media LLC
Date: 08-09-2015
DOI: 10.1038/NCOMMS9238
Abstract: Organolead halide perovskites have attracted substantial attention because of their excellent physical properties, which enable them to serve as the active material in emerging hybrid solid-state solar cells. Here we investigate the phototransistors based on hybrid perovskite films and provide direct evidence for their superior carrier transport property with ambipolar characteristics. The field-effect mobilities for triiodide perovskites at room temperature are measured as 0.18 (0.17) cm 2 V −1 s −1 for holes (electrons), which increase to 1.24 (1.01) cm 2 V −1 s −1 for mixed-halide perovskites. The photoresponsivity of our hybrid perovskite devices reaches 320 A W −1 , which is among the largest values reported for phototransistors. Importantly, the phototransistors exhibit an ultrafast photoresponse speed of less than 10 μs. The solution-based process and excellent device performance strongly underscore hybrid perovskites as promising material candidates for photoelectronic applications.
Interfacial effects revealed by ultrafast relaxation dynamics inBiFeO 3
Publisher:
American Physical Society (APS)
Date:
12-02-2016
Publisher: American Physical Society (APS)
Date: 12-02-2016
Temperature-dependent excitonic photoluminescence of hybrid organometal halide perovskite films
Publisher: Royal Society of Chemistry (RSC)
Date: 17-09-2014
DOI: 10.1039/C4CP03573A
Abstract: Organometal halide perovskites have recently attracted tremendous attention due to their potential for photovoltaic applications, and they are also considered as promising materials in light emitting and lasing devices. In this work, we investigated in detail the cryogenic steady state photoluminescence properties of a prototypical hybrid perovskite CH3NH3PbI3-xClx. The evolution of the characteristics of two excitonic peaks coincides with the structural phase transition around 160 K. Our results further revealed an exciton binding energy of 62.3 ± 8.9 meV and an optical phonon energy of 25.3 ± 5.2 meV, along with an abnormal blue-shift of the band gap in the high-temperature tetragonal phase.
Ultrathin Perovskite Monocrystals Boost the Solar Cell Performance
Publisher: Wiley
Date: 21-07-2020
Enhancing resistive switching performance and ambient stability of hybrid perovskite single crystals via embedding colloidal quantum dots
Publisher: Wiley
Date: 02-06-2020
Tailoring the photoluminescence of ZnO nanowires using Au nanoparticles
Publisher: IOP Publishing
Date: 22-09-2008
DOI: 10.1088/0957-4484/19/43/435711
Abstract: Rational design of hybrid nanostructures through attaching nanowires with nanoparticles is an effective route to enhance the existing functionalities or to explore new ones. We carry out a systematic investigation on the photoluminescence of ZnO nanowire-Au nanoparticle hybrid nanostructures synthesized by attaching Au nanoparticles onto ZnO nanowires. Citrate-stabilized 40 nm Au nanoparticles effectively quench the green emission and enhance the UV emission of the ZnO nanowires, which is consistent with the wavelength-dependent generation of surface plasmon. The UV/green emission intensity ratio could be reversibly and reproducibly tailored by attaching/detaching Au nanoparticles. This enhancement of UV emission diminishes if the Au nanoparticles are coated with a polymer layer. We also find that the orange-red emission of the ZnO nanowires is related to the excess oxygen on the ZnO surface, and it is also tunable via annealing and surface modifications.
Interfacial magnetic coupling in ultrathin all-manganite La0.7Sr0.3MnO3-TbMnO3 superlattices
Publisher: AIP Publishing
Date: 14-04-2014
DOI: 10.1063/1.4871701
Abstract: We report the growth and magnetic properties of all-manganite superlattices composed of ultrathin double-exchange ferromagnetic La0.7Sr0.3MnO3 and noncollinear multiferroic TbMnO3 layers. Spontaneous magnetization and hysteresis loops are observed in such superlattices with in idual La0.7Sr0.3MnO3 layers as thin as two unit cells, which are accompanied by pronounced exchange bias and enhanced coercivity. Our results indicate substantial interfacial magnetic coupling between spin sublattices in such superlattices, providing a powerful approach towards tailoring the properties of artificial magnetic heterostructures.
Stress relaxation of La1/2Sr1/2MnO3 and La2/3Ca1/3MnO3 at solid oxide fuel cell interfaces
Publisher: Elsevier BV
Date: 2008
Giant Piezoresistance in B-Doped SiC Nanobelts with a Gauge Factor of −1800
Publisher: American Chemical Society (ACS)
Date: 29-09-2020
Interface-based tuning of Rashba spin-orbit interaction in asymmetric oxide heterostructures with 3d electrons
Publisher: Springer Science and Business Media LLC
Date: 11-07-2019
DOI: 10.1038/S41467-019-10961-Z
Abstract: The Rashba effect plays important roles in emerging quantum materials physics and potential spintronic applications, entailing both the spin orbit interaction (SOI) and broken inversion symmetry. In this work, we devise asymmetric oxide heterostructures of LaAlO 3 //SrTiO 3 /LaAlO 3 (LAO//STO/LAO) to study the Rashba effect in STO with an initial centrosymmetric structure, and broken inversion symmetry is created by the inequivalent bottom and top interfaces due to their opposite polar discontinuities. Furthermore, we report the observation of a transition from the cubic Rashba effect to the coexistence of linear and cubic Rashba effects in the oxide heterostructures, which is controlled by the filling of Ti orbitals. Such asymmetric oxide heterostructures with initially centrosymmetric materials provide a general strategy for tuning the Rashba SOI in artificial quantum materials.
Spin-polarized transport across aLa
Publisher:
American Physical Society (APS)
Date:
07-05-2001
Publisher: American Physical Society (APS)
Date: 07-05-2001
Understanding the Role of Vanadium Vacancies in BiVO4 for Efficient Photoelectrochemical Water Oxidation
Publisher: American Chemical Society (ACS)
Date: 02-04-2021
Memory Devices: Configurable Resistive Switching between Memory and Threshold Characteristics for Protein-Based Devices (Adv. Funct. Mater. 25/2015)
Publisher: Wiley
Date: 07-2015
Integrating Low‐Cost Earth‐Abundant Co‐Catalysts with Encapsulated Perovskite Solar Cells for Efficient and Stable Overall Solar Water Splitting
Publisher: Wiley
Date: 10-11-2021
Gibbs–Thomson Effect in Planar Nanowires: Orientation and Doping Modulated Growth
Publisher: American Chemical Society (ACS)
Date: 06-06-2016
DOI: 10.1021/ACS.NANOLETT.6B01037
Abstract: Epitaxy-enabled bottom-up synthesis of self-assembled planar nanowires via the vapor-liquid-solid mechanism is an emerging and promising approach toward large-scale direct integration of nanowire-based devices without postgrowth alignment. Here, by examining large assemblies of indium tin oxide nanowires on yttria-stabilized zirconia substrate, we demonstrate for the first time that the growth dynamics of planar nanowires follows a modified version of the Gibbs-Thomson mechanism, which has been known for the past decades to govern the correlations between thermodynamic supersaturation, growth speed, and nanowire morphology. Furthermore, the substrate orientation strongly influences the growth characteristics of epitaxial planar nanowires as opposed to impact at only the initial nucleation stage in the growth of vertical nanowires. The rich nanowire morphology can be described by a surface-energy-dependent growth model within the Gibbs-Thomson framework, which is further modulated by the tin doping concentration. Our experiments also reveal that the cutoff nanowire diameter depends on the substrate orientation and decreases with increasing tin doping concentration. These results enable a deeper understanding and control over the growth of planar nanowires, and the insights will help advance the fabrication of self-assembled nanowire devices.
P-type Charge Transport and Selective Gas Sensing of All-Inorganic Perovskite Nanocrystals
Publisher: American Chemical Society (ACS)
Date: 18-09-2020
Tuning Magnetism and Photocurrent in Mn-Doped Organic–Inorganic Perovskites
Publisher: American Chemical Society (ACS)
Date: 12-03-2020
Room Temperature Magnetic Graphene Oxide‐ Iron Oxide Nanocomposite Based Magnetoresistive Random Access Memory Devices via Spin‐Dependent Trapping of Electrons
Publisher: Wiley
Date: 28-02-2014
A Bright New World of Ferroelectrics: Magic of Spontaneous Polarization
Publisher: American Chemical Society (ACS)
Date: 25-11-2020
Tunable photovoltaic effect and solar cell performance of self-doped perovskite SrTiO3
Publisher: AIP Publishing
Date: 02-11-2012
DOI: 10.1063/1.4766279
Abstract: We report on the tunable photovoltaic effect of self-doped single-crystal SrTiO3 (STO), a prototypical perovskite-structured complex oxide, and evaluate its performance in Schottky junction solar cells. The photovaltaic characteristics of vacuum-reduced STO single crystals are dictated by a thin surface layer with electrons donated by oxygen vacancies. Under UV illumination, a photovoltage of 1.1 V is observed in the as-received STO single crystal, while the s le reduced at 750 °C presents the highest incident photon to carrier conversion efficiency. Furthermore, in the STO/Pt Schottky junction, a power conversion efficiency of 0.88% was achieved under standard AM 1.5 illumination at room temperature. This work establishes STO as a high-mobility photovoltaic semiconductor with potential of integration in self-powered oxide electronics.
Strain-Manipulated Photovoltaic and Photoelectric Effects of the MAPbBr
Publisher: American Chemical Society (ACS)
Date: 14-11-2022
Abstract: Lead halide perovskite materials, such as MAPbBr
Colossal Magnetization and Giant Coercivity in Ion-Implanted (Nb and Co) MoS2 Crystals
Publisher: American Chemical Society (ACS)
Date: 16-12-2020
Anisotropic Imprint of Amorphization and Phase Separation in Manganite Thin Films via Laser Interference Irradiation
Publisher: Wiley
Date: 16-09-2014
Abstract: Materials with mesoscopic structural and electronic phase separation, either inherent from synthesis or created via external means, are known to exhibit functionalities absent in the homogeneous counterparts. One of the most notable ex les is the colossal magnetoresistance discovered in mixed-valence manganites, where the coexistence of nano- to micrometer-sized phase-separated domains dictates the magnetotransport. However, it remains challenging to pattern and process such materials into predesigned structures and devices. In this work, a direct laser interference irradiation (LII) method is employed to produce periodic stripes in thin films of a prototypical phase-separated manganite Pr0.65 (Ca0.75 Sr0.25 )0.35 MnO3 (PCSMO). LII induces selective structural amorphization within the crystalline PCSMO matrix, forming arrays with dimensions commensurate with the laser wavelength. Furthermore, because the length scale of LII modification is compatible to that of phase separation in PCSMO, three orders of magnitude of increase in magnetoresistance and significant in-plane transport anisotropy are observed in treated PCSMO thin films. Our results show that LII is a rapid, cost-effective and contamination-free technique to tailor and improve the physical properties of manganite thin films, and it is promising to be generalized to other functional materials.
Metal-layer-assisted coalescence of Au nanoparticles and its effect on diameter control in vapor-liquid-solid growth of oxide nanowires
Publisher: American Physical Society (APS)
Date: 04-01-2011
Effects of High Temperature and Thermal Cycling on the Performance of Perovskite Solar Cells: Acceleration of Charge Recombination and Deterioration of Charge Extraction
Publisher: American Chemical Society (ACS)
Date: 28-09-2017
Abstract: In this work, we investigated the effects of high operating temperature and thermal cycling on the photovoltaic (PV) performance of perovskite solar cells (PSCs) with a typical mesostructured (m)-TiO
A general lithography-free method of microscale/nanoscale fabrication and patterning on Si and Ge surfaces
Publisher: Springer Science and Business Media LLC
Date: 08-02-2012
2D Organic–Inorganic Hybrid Thin Films for Flexible UV–Visible Photodetectors
Publisher: Wiley
Date: 13-02-2017
Hybrid perovskite quantum dot/non-fullerene molecule solar cells with efficiency over 15%
Publisher: Wiley
Date: 19-04-2021
Abstract: Organic‐inorganic hybrid film using conjugated materials and quantum dots (QDs) are of great interest for solution‐processed optoelectronic devices, including photovoltaics (PVs). However, it is still challenging to fabricate conductive hybrid films to maximize their PV performance. Herein, for the first time, superior PV performance of hybrid solar cells consisting of CsPbI 3 perovskite QDs and Y6 series non‐fullerene molecules is demonstrated and further highlights their importance on hybrid device design. In specific, a hybrid active layer is developed using CsPbI 3 QDs and non‐fullerene molecules, enabling a type‐II energy alignment for efficient charge transfer and extraction. Additionally, the non‐fullerene molecules can well passivate the QDs, reducing surface defects and energetic disorder. The ch ion CsPbI 3 QD/Y6‐F hybrid device has a record‐high efficiency of 15.05% for QD/organic hybrid PV devices, paving a new way to construct solution‐processable hybrid film for efficient optoelectronic devices.
High Coercivity and Magnetization in WSe2 by Codoping Co and Nb
Publisher: Wiley
Date: 22-08-2019
Abstract: Introducing ferromagnetism in transition metal dichalcogenides has attracted lots of attention due to the possible applications in spintronics devices. Generally, single magnetic element doping is used to introduce magnetism. However, mostly, weak ferromagnetism is observed. In this work, codoping of two kinds of transition metals (Nb and Co) into WSe
A monolithic artificial iconic memory based on highly stable perovskite-metal multilayers
Publisher: AIP Publishing
Date: 15-07-2020
DOI: 10.1063/5.0009713
Abstract: Artificial iconic memories, also called photomemories, are new types of nonvolatile memory that can simultaneously detect and store light information in a monolithic device. Several approaches have been proposed to construct artificial iconic memories, such as three-terminal field effect transistors, which can achieve an effective control of the gate voltage and external light terminals. The drawbacks in constructing these memories involve complicated fabrication processes, and the resulting performance of, for ex le, perovskite transistor-type photomemories is limited by the low carrier mobilities and poor ambient stabilities, whereas architectures based on floating gate modulations entail strict interface engineering and poor device reliability. In this paper, we propose a novel monolithic artificial iconic memory with a multilayer architecture of indium tin oxide erovskite/gold erovskite/silver, which combines the memory and photodetector functionalities of perovskites in an integrated device. The bottom perovskite layer plays the role of a photodetector, modulating the voltage bias on the top perovskite layer that serves as a resistive switching memory. This multilayer perovskite device can store photo-sensing data in its resistive states, with a memory retention of 5 × 103 s and ambient stability longer than sixty days. As a prototype demonstration, a 7 × 7 artificial iconic memory array is constructed to detect and store data on light intensity distribution, enabling a nonvolatile imaging functionality. Our work provides a new platform for designing perovskite-based architectures with simultaneous light detection and data storage capabilities.
Orthorhombic Ti2O3: A Polymorph‐Dependent Narrow‐Bandgap Ferromagnetic Oxide
Publisher: Wiley
Date: 15-12-2017
Embedding 1D Conducting Channels into 3D Isoporous Polymer Films for High‐Performance Humidity Sensing
Publisher: Wiley
Date: 08-2018
Effects of electrode material and configuration on the characteristics of planar resistive switching devices
Publisher: AIP Publishing
Date: 11-2013
DOI: 10.1063/1.4827597
Abstract: We report that electrode engineering, particularly tailoring the metal work function, measurement configuration and geometric shape, has significant effects on the bipolar resistive switching (RS) in lateral memory devices based on self-doped SrTiO3 (STO) single crystals. Metals with different work functions (Ti and Pt) and their combinations are used to control the junction transport (either ohmic or Schottky-like). We find that the electric bias is effective in manipulating the concentration of oxygen vacancies at the metal/STO interface, influencing the RS characteristics. Furthermore, we show that the geometric shapes of electrodes (e.g., rectangular, circular, or triangular) affect the electric field distribution at the metal/oxide interface, thus plays an important role in RS. These systematic results suggest that electrode engineering should be deemed as a powerful approach toward controlling and improving the characteristics of RS memories.
Ferroelectric BiFeO3as an Oxide Dye in Highly Tunable Mesoporous All-Oxide Photovoltaic Heterojunctions
Publisher: Wiley
Date: 05-10-2016
Abstract: As potential photovoltaic materials, transition-metal oxides such as BiFeO
Tunable transport properties of n-type ZnO nanowires by Ti plasma immersion ion implantation
Publisher: AIP Publishing
Date: 10-2008
DOI: 10.1063/1.2981189
Abstract: Single-crystalline, transparent conducting ZnO nanowires were obtained simply by Ti plasma immersion ion implantation (PIII). Electrical transport characterizations demonstrate that the n-type conduction of ZnO nanowire could be tuned by appropriate Ti-PIII. When the energy of PIII is increased, the resistivity of ZnO decreases from 4×102 to 3.3×10−3 Ω cm, indicating a semiconductor-metal transition. The failure-current densities of the metallic ZnO could be up to 2.75×107 A/cm2. Therefore, this facile method may provide an inexpensive alternative to tin doped indium oxide as transparent conducting oxide materials.
Single crystal hybrid perovskite field-effect transistors
Publisher: Springer Science and Business Media LLC
Date: 17-12-2018
DOI: 10.1038/S41467-018-07706-9
Abstract: The fields of photovoltaics, photodetection and light emission have seen tremendous activity in recent years with the advent of hybrid organic-inorganic perovskites. Yet, there have been far fewer reports of perovskite-based field-effect transistors. The lateral and interfacial transport requirements of transistors make them particularly vulnerable to surface contamination and defects rife in polycrystalline films and bulk single crystals. Here, we demonstrate a spatially-confined inverse temperature crystallization strategy which synthesizes micrometre-thin single crystals of methylammonium lead halide perovskites MAPbX 3 (X = Cl, Br, I) with sub-nanometer surface roughness and very low surface contamination. These benefit the integration of MAPbX 3 crystals into ambipolar transistors and yield record, room-temperature field-effect mobility up to 4.7 and 1.5 cm 2 V −1 s −1 in p and n channel devices respectively, with 10 4 to 10 5 on-off ratio and low turn-on voltages. This work paves the way for integrating hybrid perovskite crystals into printed, flexible and transparent electronics.
Transport and magnetic properties of La0.8Ce0.2MnO3 thin films grown by pulsed laser deposition
Publisher: Elsevier BV
Date: 10-2000
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