ORCID Profile
0000-0002-1608-6860
Current Organisation
Monash 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)
Optical Properties of Materials | Nanoscale Characterisation | Functional Materials | Nanotechnology | Materials engineering | Synthesis of Materials | Colloid and Surface Chemistry | Condensed Matter Physics | Macromolecular and Materials Chemistry | Nanochemistry and Supramolecular Chemistry | Synchrotrons; Accelerators; Instruments and Techniques | Theory and Design of Materials | Transport Properties and Non-Equilibrium Processes | Structural Chemistry and Spectroscopy | Nanomaterials | Functional materials | Nanomaterials | Manufacturing Engineering | Manufacturing Processes and Technologies (excl. Textiles) | Microtechnology | Photonics, Optoelectronics and Optical Communications | Electronic and Magnetic Properties of Condensed Matter; Superconductivity | Molecular and Organic Electronics | Electrochemical energy storage and conversion
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in Technology | Expanding Knowledge in the Physical Sciences | Expanding Knowledge in the Chemical Sciences | Solar-Photovoltaic Energy | Industrial Machinery and Equipment |
Related Links
Publications
Mimicry of sputtered i-ZnO thin films using chemical bath deposition for solution-processed solar cells
Publisher: American Chemical Society (ACS)
Date: 15-12-2014
DOI: 10.1021/AM506611J
Abstract: Solution processing provides a versatile and inexpensive means to prepare functional materials with specifically designed properties. The current challenge is to mimic the structural, optical, and/or chemical properties of thin films fabricated by vacuum-based techniques using solution-based approaches. In this work we focus on ZnO to show that thin films grown using a simple, aqueous-based, chemical bath deposition (CBD) method can mimic the properties of sputtered coatings, provided that the kinetic and thermodynamic reaction parameters are carefully tuned. The role of these parameters toward growing highly oriented and dense ZnO thin films is fully elucidated through detailed microscopic and spectroscopic investigations. The prepared s les exhibit bulk-like optical properties, are intrinsic in their electronic characteristics, and possess negligible organic contaminants, especially when compared to ZnO layers deposited by sol-gel or from nanocrystal inks. The efficacy of our CBD-grown ZnO thin films is demonstrated through the effective replacement of sputtered ZnO buffer layers within high efficiency solution processed Cu2ZnSnS4xSe4(1-x) solar cells.
Evaluation of the utility of screening mammography for high-risk women undergoing screening breast MR imaging
Publisher: Radiological Society of North America (RSNA)
Date: 10-2017
DOI: 10.1148/RADIOL.2017161103
Abstract: Purpose To evaluate the value of mammography in detecting breast cancer in high-risk women undergoing screening breast magnetic resonance (MR) imaging. Materials and Methods An ethics-approved, retrospective review of prospective databases was performed to identify outcomes of 3934 screening studies (1977 screening MR imaging examinations and 1957 screening mammograms) performed between January 2012 and July 2014 in 1249 high-risk women. Performance measures including recall and cancer detection rates, sensitivity, specificity, and positive predictive values were calculated for both mammography and MR imaging. Results A total of 45 cancers (33 invasive and 12 ductal carcinomas in situ) were diagnosed, 43 were seen with MR imaging and 14 with both mammography and MR imaging. Additional tests (further imaging and/or biopsy) were recommended in 461 screening MR imaging studies (recall rate, 23.3% 95% confidence interval [CI]: 21.5%, 25.2%), and mammography recalled 217 (recall rate, 11.1% 95% CI: 9.7%, 12.6%). The cancer detection rate for MR imaging was 21.8 cancers per 1000 examinations (95% CI: 15.78, 29.19) and that for mammography was 7.2 cancers per 1000 examinations (95% CI: 3.92, 11.97 P < .001). Sensitivity and specificity of MR imaging were 96% and 78% respectively, and those of mammography were 31% and 89%, respectively (P < .001). Positive predictive value for MR imaging recalls was 9.3% (95% CI: 6.83%, 12.36%) and that for mammography recalls was 6.5% (95% CI: 3.57%, 10.59%). Conclusion Contemporaneous screening mammography did not have added value in detection of breast cancer for women who undergo screening MR imaging. Routine use of screening mammography in women undergoing screening breast MR imaging warrants reconsideration.
Linking Vertical Bulk‐Heterojunction Composition and Transient Photocurrent Dynamics in Organic Solar Cells with Solution‐Processed MoOx Contact Layers
Publisher: Wiley
Date: 24-10-2013
Macroporous perovskite nanocrystal composites for ultrasensitive copper ion detection
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2NR02737B
Abstract: CsPbBr 3 -(SH)polyHIPE composite was produced by adhering CsPbBr 3 nanocrystals to a (SH)-polyHIPE substrate. This well-designed composite has an extremely high sensitivity to copper ions in organic solvents.
Highly Efficient Amplified Stimulated Emission from CdSe-CdS-ZnS Quantum Dot Doped Waveguides with Two-Photon Infrared Optical Pumping
Publisher: Wiley
Date: 07-01-2008
Understanding the chemical origin of improved thin-film device performance from photodoped ZnO nanoparticles
Publisher: Elsevier BV
Date: 05-2014
Review of the synthetic chemistry involved in the production of core/shell semiconductor nanocrystals
Publisher: CSIRO Publishing
Date: 2007
DOI: 10.1071/CH07046
Abstract: Passivation of CdSe semiconductor nanocrystals can be achieved by overcoating the particles with a homogeneous shell of a second semiconductor. Shell layers are grown in monolayer steps to ensure homogeneous growth of the shell. The relative band edges of the two materials determine the photoreactiveity of the resultant core-shell nanocrystals. The critical role of ligands in minimizing nucleation of the shell material during the growth of the passivating layer is emphasized. The delocalization of charge carriers into the shell layers can be followed spectroscopically during the growth processes. The relative spectral shifts are directly correlated to the relative energies of the band edges.
Non-injection synthesis of doped zinc oxide plasmonic nanocrystals
Publisher: American Chemical Society (ACS)
Date: 19-08-2014
DOI: 10.1021/NN5027593
Abstract: Plasmonic metal oxide nanocrystals bridge the optoelectronic gap between semiconductors and metals. In this study, we report a facile, non-injection synthesis of ZnO nanocrystals doped with Al, Ga, or In. The reaction readily permits dopant/zinc atomic ratios of over 15%, is amenable to high precursor concentrations (0.2 M and greater), and provides high reaction yields (>90%). The resulting colloidal dispersions exhibit high transparency in the visible spectrum and a wavelength-tunable infrared absorption, which arises from a dopant-induced surface plasmon resonance. Through a detailed investigation of reaction parameters, the reaction mechanism is fully characterized and correlated to the optical properties of the synthesized nanocrystals. The distinctive optical features of these doped nanocrystals are shown to be readily harnessed within thin films that are suitable for optoelectronic applications.
A hybrid organic–inorganic three-dimensional cathode interfacial material for organic solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7RA04044J
Abstract: An alcohol soluble hybrid organic–inorganic three-dimensional material POSS-FN has been synthesized and assessed as a cathode interlayer within organic solar cells consisting of a PBDT-BT:PC 61 BM bulk heterojunction.
Mechanistic Insights in Seeded Growth Synthesis of Colloidal Core/Shell Quantum Dots
Publisher: American Chemical Society (ACS)
Date: 06-2017
Insights into π-Conjugated Small Molecule Neat Films and Blends As Determined Through Photoconductivity
Publisher: American Chemical Society (ACS)
Date: 24-09-2012
DOI: 10.1021/NN303724M
Abstract: Spectrally dependent steady-state photoconductivity is a convenient method to gain insight into the charge generation and transport processes within a given material. In this work, we report on the photoconductive response of solution-processed neat films and blends of the fullerene, PC(71)BM, and the donor-acceptor small-molecule, p-DTS(PTTh(2))(2), as function of the processing additive, diiodooctance (DIO). The results, when considered in the context of their structural, optical, and electronic properties give insight into the dominant carrier generation and charge transport mechanisms in each of these molecular systems.
All-optical integrated micro logic gate
Publisher: Elsevier BV
Date: 02-2011
Non-injection synthesis of Cu2ZnSnS4 nanocrystals using a binary precursor and ligand approach
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2RA21530F
Highly luminescent metal-organic frameworks through quantum dot doping
Publisher: Wiley
Date: 19-10-2012
Abstract: The incorporation of highly luminescent core-shell quantum dots (QDs) within a metal-organic framework (MOF) is achieved through a one-pot method. Through appropriate surface functionalization, the QDs are solubilized within MOF-5 growth media. This permits the incorporation of the QDs within the evolving framework during the reaction. The resulting QD@MOF-5 composites are characterized using X-ray fluorescence, cross-sectional confocal microscopy, energy-dispersive X-ray spectroscopy, scanning electron microscopy, and small-angle X-ray scattering. The synergistic combination of luminescent QDs and the controlled porosity of MOF-5 in the QD@MOF-5 composites is harnessed within a prototype molecular sensor that can discriminate on the basis of molecular size.
High‐Performance and Stable Semi‐Transparent Perovskite Solar Cells through Composition Engineering
Publisher: Wiley
Date: 26-05-2022
Abstract: Semi‐transparent perovskite solar cells (ST‐PeSCs) have tremendous potential as solar windows owing to their higher efficiency and visible transmittance. However, studies toward this application are still nascent, particularly in unraveling the interplay between how the perovskite composition impacts the achievable device performance and stability. Here, the role of A‐ and X‐site modification in APbX 3 perovskites is studied to understand their influence on these factors. Through detailed experimental and simulation work, it is found that a perovskite composition consisting of cesium (Cs) and formamidinium (FA) at the A‐site delivers the best device performance over a range of band gaps, which are tuned by changes to the X‐site anion. Using this optimized perovskite composition, power conversion efficiencies of 15.5% and 4.1% are achieved for ST‐PeSCs with average visible transmittance values between 20.7% and 52.4%, respectively. Furthermore, the CsFA‐based ST‐PeSCs show excellent long‐term stability under continuous illumination and heating. The stability of the precursor solutions across each of the studied compositions has also been considered, showing dramatic differences in the structural properties of the perovskites and their device performance for all mixed A‐site compositions possessing the archetypal methyl ammonium species, while also confirming the superior stability of the CsFA precursor solutions.
Characterization of a Porphyrin-Containing Dye-Sensitized Solar Cell
Publisher: American Chemical Society (ACS)
Date: 22-07-2004
DOI: 10.1021/JP048073I
In Situ Formation of Reactive Sulfide Precursors in the One-Pot, Multigram Synthesis of Cu2ZnSnS4 Nanocrystals
Publisher: American Chemical Society (ACS)
Date: 05-03-2013
DOI: 10.1021/CG4000268
Three-Pulse Photon Echo Peak Shift Measurements of Capped CdSe Quantum Dots
Publisher: American Chemical Society (ACS)
Date: 19-11-2009
DOI: 10.1021/JP9083103
Aqueous Synthesis of Cu2ZnSnSe4 Nanocrystals
Publisher: American Chemical Society (ACS)
Date: 05-03-2019
Tunable 3D Arrays of Quantum Dots: Synthesis and Luminescence Properties
Publisher: Wiley
Date: 09-01-2006
Prospects of Z-Scheme Photocatalytic Systems Based on Metal Halide Perovskites
Publisher: American Chemical Society (ACS)
Date: 23-04-2021
Electrically Stable, Solution-Processed Amorphous Oxide IZO Thin-Film Transistors Through a UV-Ozone Assisted Sol-Gel Approach
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2014
Ionization potential and electron attenuation length of titanium dioxide deposited by atomic layer deposition determined by photoelectron spectroscopy in air
Publisher: Elsevier BV
Date: 11-2017
Correction to “Insights into π-Conjugated Small Molecule Neat Films and Blends As Determined Through Photoconductivity”
Publisher: American Chemical Society (ACS)
Date: 16-01-2013
DOI: 10.1021/NN4001319
Plasmonic Ge-Doped ZnO Nanocrystals
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CC02429C
Abstract: The first colloidal synthesis of Ge-doped ZnO nanocrystals is presented. Ge dopants induce a surface plasmon resonance in the infrared and affect the ZnO nanocrystal morphology.
The Heat-Up Synthesis of Colloidal Nanocrystals
Publisher: American Chemical Society (ACS)
Date: 03-04-2015
DOI: 10.1021/CM5028964
Glass-based 1-D dielectric microcavities
Publisher: Elsevier BV
Date: 11-2016
Improved lifetimes of organic solar cells with solution‐processed molybdenum oxide anode‐modifying layers
Publisher: Wiley
Date: 29-05-2014
DOI: 10.1002/PIP.2512
Examining the role of ultra-thin atomic layer deposited metal oxide barrier layers on CdTe/ITO interface stability during the fabrication of solution processed nanocrystalline solar cells
Publisher: Elsevier BV
Date: 06-2014
Mapping the Optical Properties of CdSe/CdS Heterostructure Nanocrystals: The Effects of Core Size and Shell Thickness
Publisher: American Chemical Society (ACS)
Date: 15-09-2009
DOI: 10.1021/JA9030209
Abstract: Here we present the first comprehensive report on CdSe/CdS heterostructure nanocrystals. The effects of core size and shell thickness on the optical properties of CdSe/CdS heterostructure nanocrystals are investigated. We report a reliable synthetic method to grow thick CdS shells on CdSe cores with sizes ranging from 2.5-4.7 nm. We provide a calibration curve, which enables determination of CdS shell thickness (+/-0.1 nm) over a wide range of core sizes, circumventing the need for time-consuming HRTEM analyses. Epitaxial growth of the shells was verified by HRTEM, XRD, and SAED. In-situ reaction measurements revealed the average per particle (p) deposition rates for cadmium and sulfur to be k(Cd) = 5.38 x 10(-25) mol s(-1) p(-1) and k(S) = 4.83 x 10(-24) mol s(-1) p(-1). Faster sulfur deposition rates are attributed to the absence of strong sulfur binding ligands in the growth medium. Through the rigorous use of high resolution transmission electron microscopy, a direct link between the dimensions of the heterostructures and their band-edge transition energies, quantum yields, and excited state lifetimes is established. The experiments show that the band-edge transition energies of the core s les, which initially span approximately 431 meV, condense to span only 163 meV after the growth of a 6 monolayer-thick CdS shell. Furthermore, shifts in the band-edge transition energies were found to be extremely sensitive to core size. The QY of the as-prepared core/shells ranged from 25 to 60%. The QYs and band-edge lifetimes of the core/shells were found to depend upon the ligands adsorbed to the particle surface. These data prove that one or both of the charge carriers still has access to the particle surface despite the presence of a 2.2 nm thick CdS shell.
Binding and Packing in Two-Component Colloidal Quantum Dot Ligand Shells: Linear versus Branched Carboxylates
Publisher: American Chemical Society (ACS)
Date: 24-02-2017
DOI: 10.1021/JACS.6B11328
Abstract: In this work, we present a combined experimental and theoretical analysis of two-component ligand shells passivating CdSe quantum dots. Using nuclear magnetic resonance spectroscopy, we first show that exposing oleate-capped quantum dots to primary carboxylic acids results in a one-for-one exchange that preserves the overall ligand surface concentration. Exposure to straight-chain acids leads to a binary ligand shell that behaves as an ideal mixture and that has a composition matching the overall acid composition of the dispersion. In the case of branched-chain acids, the exchange is restricted to about 25% of the original ligands. Based on molecular dynamics simulations, we argue that this behavior reflects the more favorable packing of oleates compared to branched carboxylates on the (100) facets of CdSe quantum dots.
Inverted semi-transparent organic solar cells with spray coated, surfactant free polymer top-electrodes
Publisher: Elsevier BV
Date: 03-2012
Aqueous Synthesis of High-Quality Cu2 ZnSnS4 Nanocrystals and Their Thermal Annealing Characteristics
Publisher: American Chemical Society (ACS)
Date: 19-01-2018
DOI: 10.1021/ACS.LANGMUIR.7B03885
Abstract: Copper zinc tin sulfide (CZTS) nanocrystal inks are promising candidates for the development of cheap, efficient, scalable, and nontoxic photovoltaic (PV) devices. However, optimization of the synthetic chemistry to achieve these goals remains a key challenge. Herein we describe a single-step, aqueous-based synthesis that yields high-quality CZTS nanocrystal inks while also minimizing residual organic impurities. By exploiting simultaneous redox and crystal formation reactions, square-platelet-like CZTS nanocrystals stabilized by Sn
Au Nanoparticle Monolayers Covered with Sol–Gel Oxide Thin Films: Optical and Morphological Study
Publisher: American Chemical Society (ACS)
Date: 19-10-2011
DOI: 10.1021/LA2032829
Abstract: In this work, we provide a detailed study of the influence of thermal annealing on submonolayer Au nanoparticle deposited on functionalized surfaces as standalone films and those that are coated with sol-gel NiO and TiO(2) thin films. The systems are characterized through the use of UV-vis absorption, X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), and spectroscopic ellipsometry. The surface plasmon resonance peak of the Au nanoparticles was found to red-shift and increase in intensity with increasing surface coverage, an observation that is directly correlated to the complex refractive index properties of Au nanoparticle layers. The standalone Au nanoparticles sinter at 200 °C, and a relationship between the optical properties and the annealing temperature is presented. When overcoated with sol-gel metal oxide films (NiO, TiO(2)), the optical properties of the Au nanoparticles are strongly affected by the metal oxide, resulting in an intense red shift and broadening of the plasmon band moreover, the temperature-driven sintering is strongly limited by the metal oxide layer. Optical sensing tests for ethanol vapor are presented as one possible application, showing reversible sensing dynamics and confirming the effect of Au nanoparticles in increasing the sensitivity and in providing a wavelength dependent response, thus confirming the potential use of such materials as optical probes.
Highly Luminescent and Temperature Stable Quantum Dot Thin Films Based on a ZnS Composite
Publisher: American Chemical Society (ACS)
Date: 06-2012
DOI: 10.1021/CM300661Q
A Hyperbranched Conjugated Polymer as the Cathode Interlayer for High‐Performance Polymer Solar Cells
Publisher: Wiley
Date: 07-10-2013
Abstract: An alcohol-soluble hyperbranched conjugated polymer HBPFN with a dimethylamino moiety is synthesized and used as a cathode interlayer. A PCE of 7.7% is obtained for PBDTTT-C-T/PC71 BM based solar cells. No obvious interfacial dipole is found at the interface between the active layer and HBPFN however, an interfacial dipole with the cathode could be one of the reasons for the enhanced performance.
Synthesis of CsPbBr3 perovskite nanocrystals with acoustically actuated millisecond mixing
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0TC04519E
Abstract: Improved morphology and size homogeneity of CsPbBr 3 perovskite nanocrystals synthesised at low-temperature through highly efficient acoustic mixing in a microfluidic platform.
Stabilizing the cubic perovskite phase of CsPbI3 nanocrystals by using an alkyl phosphinic acid
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6CC08282C
Abstract: Phase-stable perovskite CsPbI 3 nanocrystals have been prepared by replacing conventionally used oleic acid with a phosphinic acid in their synthesis.
Capillary-bridge mediated assembly of aligned perovskite quantum dots for high-performance photodetectors
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TC01104H
Abstract: A liquid bridge induced assembly strategy to align perovskite QDs in one direction for high-performance photodetectors.
Identification of high-temperature exciton states and their phase-dependent trapping behaviour in lead halide perovskites
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7EE03543H
Abstract: A high-temperature-stable bound exciton (BE) within perovskites and a phase-dependent exciton trapping behaviour have been identified.
Solution-processed CdS thin films from a single-source precursor
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3TC32189D
Facile purification of CsPbX
Publisher: AIP Publishing
Date: 28-09-2019
DOI: 10.1063/1.5123306
Abstract: CsPbI
Hybrid 1-D dielectric microcavity: Fabrication and spectroscopic assessment of glass-based sub-wavelength structures
Publisher: Elsevier BV
Date: 07-2015
Flash-assisted processing of highly conductive zinc oxide electrodes from water
Publisher: Wiley
Date: 05-11-2015
Phosphine-Free Synthesis of CdSe Nanocrystals
Publisher: American Chemical Society (ACS)
Date: 13-10-2005
DOI: 10.1021/JP054289O
Abstract: High quality CdSe nanocrystals have been prepared using elemental selenium as the chalcogenide precursor dispersed in 1-octadecene (ODE). The conditions used to prepare the Se precursor were found to be critical for successful nanocrystal synthesis. Systematic titration of the Se precursor solution with tri-n-octylphosphine (TOP) allowed the Se reactivity to be tuned and the final particle size to be controlled. Band-edge and surface related emission were observed for s les prepared in the presence and absence of added TOP. In the absence of a selenium passivant, the crystal structure of CdSe nanocrystals could be altered from zinc blende to wurtzite by the addition of bis(2,2,4-trimethylpentyl)phosphinic acid (TMPPA).
Inverted perovskite solar cells with high fill-factors featuring chemical bath deposited mesoporous NiO hole transporting layers
Publisher: Elsevier BV
Date: 07-2018
Scalable synthesis of colloidal CsPbBr
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9NR10726F
Abstract: The ligand assisted reprecipitation (LARP) technique is an accessible and facile method that can synthesize metal halide perovskite nanocrystals (PNCs) under ambient conditions. However, low product yields of less than 30% for LARP and its contemporary methods are indicative of highly inefficient reactions. In this work we apply the principles of green chemistry to the LARP technique for synthesizing CsPbBr3 PNCs and help address this issue. Through these efforts, high product yields of ∼70% are achieved using stochiometric Cs : Pb precursor ratios. This is realized by (i) substituting the conventional toluene (TOL) anti-solvent with ethyl acetate (EA) and (ii) replacing the conventionally used unsaturated oleylamine ligand with the shorter saturated octylamine ligand. These changes also result in a 60% molar reduction in total ligand concentration and a 62.5% reduction in solvent waste during purification. The synthesized PNCs are comparable to the TOL-LARP reference in crystal quality, morphology and phase, with their photoluminescence quantum yields being readily enhanced to over 80% through additions of RNH3Br ligands. The spectral versatility of these materials is demonstrated through post-synthetic chloride and iodide halide anion exchange, which readily yields tunable CsPbX3 derivatives across the visible spectrum. Our EA-LARP protocol is further shown to be readily upscaled to ∼0.5 L, while maintaining good nanocrystal properties and a product yield of 60%.
Solution‐Processed Nanocrystal Quantum Dot Tandem Solar Cells
Publisher: Wiley
Date: 03-06-2011
Observation of Phonon Cascades in Cu-Doped Colloidal Quantum Wells
Publisher: American Chemical Society (ACS)
Date: 03-11-2022
DOI: 10.1021/ACS.NANOLETT.2C03427
Abstract: Electronic doping has endowed colloidal quantum wells (CQWs) with unique optical and electronic properties, holding great potential for future optoelectronic device concepts. Unfortunately, how photogenerated hot carriers interact with phonons in these doped CQWs still remains an open question. Here, through investigating the emission properties, we have observed an efficient phonon cascade process (i.e., up to 27 longitudinal optical phonon replicas are revealed in the broad Cu emission band at room temperature) and identified a giant Huang-Rhys factor (
Facile Deposition of Mesoporous PbI2 through DMF:DMSO Solvent Engineering for Sequentially Deposited Metal Halide Perovskites
Publisher: American Chemical Society (ACS)
Date: 26-03-2020
Sol-Gel processed high performance metal oxide thin-film transistors for low-cost and transparent electronics
Publisher: IEEE
Date: 12-2010
Enhancement of 3D/2D Perovskite Solar Cells Using an F4TCNQ Molecular Additive
Publisher: American Chemical Society (ACS)
Date: 09-2020
Microfluidic Processing of Ligand-Engineered NiO Nanoparticles for Low-Temperature Hole-Transporting Layers in Perovskite Solar Cells
Publisher: Wiley
Date: 28-06-2021
Abstract: Nickel oxide (NiO) is used as a hole‐transporting layer (HTL) in perovskite solar cells (PSCs) because of its high optical transmittance, intrinsic p‐type doping, and suitable valence band energy level. However, fabricating high‐quality NiO films typically requires high‐temperature annealing, which limits their applicability for low‐temperature, printable PSCs. Herein, the need for such postprocessing steps is circumvented by coupling 4‐hydroxybenzoic acid (HBA) or trimethyloxonium tetrafluoroborate (Me 3 OBF 4 ) ligand‐modified NiO nanoparticles (NPs) with a Tesla‐valve microfluidic mixer to deposit high‐quality NiO films at a temperature °C. The NP dispersions and the resulting thin films are thoroughly characterized using a combination of optical, structural, thermal, chemical, and electrical methods. While the optical and structural properties of the ligand‐exchanged NiO NPs remain comparable with those possessing the native long‐chained aliphatic ligands, the ligand‐modified NiO thin films exhibit dramatic reductions in surface energy and an increase in hole mobilities. These are correlated with concomitant and significant enhancements in performance and stability factors of PSCs when the ligand‐modified NiO NPs are used as HTL layers within p−i−n device architectures.
Molecular mechanisms of thermal instability in hybrid perovskite light absorbers for photovoltaic solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA05356B
Abstract: This work explores the molecular-level mechanisms of thermal instability in pristine and defective crystals of the prototypical hybrid perovskite MAPbI 3 .
Interfacial Characteristics of Efficient Bulk Heterojunction Solar Cells Fabricated on MoOx Anode Interlayers
Publisher: Wiley
Date: 15-10-2016
Abstract: The role of the interface between an MoOx anode interlayer and a polymer:fullerene bulk heterojunction is investigated. Processing differences in the MoOx induce large variations in the vertical stratification of the bulk heterojunction films. These variations are found to be inconsistent in predicting device performance, with a much better gauge being the quantity of polymer chemisorbed to the anode interlayer.
Plastic Microgroove Solar Cells Using CuInSe2 Nanocrystals
Publisher: American Chemical Society (ACS)
Date: 24-10-2016
A Stable Aqueous SnO2 Nanoparticle Dispersion for Roll-to-Roll Fabrication of Flexible Perovskite Solar Cells
Publisher: MDPI AG
Date: 12-12-2022
Abstract: Perovskite solar cells (PSCs) are attracting increasing commercial interest due to their potential as cost-effective, lightweight sources of solar energy. Low-cost, large-scale printing and coating processes can accelerate the development of PSCs from the laboratory to the industry. The present work demonstrates the use of microwave-assisted solvothermal processing as a new and efficient route for synthesizing crystalline SnO2 nanoparticle-based aqueous dispersions having a narrow particle size distribution. The SnO2 nanoparticles are analyzed in terms of their optical, structural, size, phase, and chemical properties. To validate the suitability of these dispersions for use in roll-to-roll (R2R) coating, they were applied as the electron-transport layer in PSCs, and their performance was compared with equivalent devices using a commercially available aqueous SnO2 colloidal ink. The devices were fabricated under ambient laboratory conditions, and all layers were deposited at less than 150 °C. The power conversion efficiency (PCE) of glass-based PSCs comprising a synthesized SnO2 nanoparticle dispersion displayed ch ion levels of 20.2% compared with 18.5% for the devices using commercial SnO2 inks. Flexible PSCs comprising an R2R-coated layer of synthesized SnO2 nanoparticle dispersion displayed a ch ion PCE of 17.0%.
Nanocrystals, Layer‐by‐Layer Assembly, and Photovoltaic Devices
Publisher: Wiley
Date: 20-04-2015
Photonic Sintering of Copper through the Controlled Reduction of Printed CuO Nanocrystals
Publisher: American Chemical Society (ACS)
Date: 06-11-2015
Abstract: The ability to control chemical reactions using ultrafast light exposure has the potential to dramatically advance materials and their processing toward device integration. In this study, we show how intense pulsed light (IPL) can be used to trigger and modulate the chemical transformations of printed copper oxide features into metallic copper. By varying the energy of the IPL, CuO films deposited from nanocrystal inks can be reduced to metallic Cu via a Cu2O intermediate using single light flashes of 2 ms duration. Moreover, the morphological transformation from isolated Cu nanoparticles to fully sintered Cu films can also be controlled by selecting the appropriate light intensity. The control over such transformations enables for the fabrication of sintered Cu electrodes that show excellent electrical and mechanical properties, good environmental stability, and applications in a variety of flexible devices.
Re-examination of the Size-Dependent Absorption Properties of CdSe Quantum Dots
Publisher: American Chemical Society (ACS)
Date: 15-10-2009
DOI: 10.1021/JP906827M
A new method to position and functionalize metal-organic framework crystals
Publisher: Springer Science and Business Media LLC
Date: 15-03-2011
DOI: 10.1038/NCOMMS1234
Semi-transparent solar cells
Publisher: IOP Publishing
Date: 03-02-2017
Complete Quenching of CdSe Nanocrystal Photoluminescence by Single Dye Molecules
Publisher: Wiley
Date: 13-11-2008
Influence of core-shell interfaces on exciton and multi-exciton dynamics of CdSe-CdxZn1-xS quantum dots
Publisher: SPIE
Date: 10-09-2014
DOI: 10.1117/12.2060973
Synthetic Evolution of Colloidal Metal Halide Perovskite Nanocrystals.
Publisher: American Chemical Society (ACS)
Date: 04-06-2019
DOI: 10.1021/ACS.LANGMUIR.9B00855
Abstract: Metal halide perovskite semiconductor nanocrystals have emerged as a lucrative class of materials for many optoelectronic applications. By leveraging the synthetic toolboxes developed from decades of research into more traditional semiconductor nanocrystals, remarkable progress has been made across these materials in terms of their structural, compositional, and optoelectronic control. Here, we review this progress in terms of their underlying formation stages, synthetic approaches, and postsynthetic treatment steps. This assessment highlights the rapidly maturing nature of the perovskite nanocrystal field, particularly with regard to their lead-based derivatives. It further demonstrates that significant challenges remain around precisely controlling their nucleation and growth processes. In going forward, a deeper understanding of the role of precursors and ligands will significantly bolster the versatility in the size, shape, composition, and functional properties of these exciting materials.
From Cd-Rich to Se-Rich − the Manipulation of CdSe Nanocrystal Surface Stoichiometry
Publisher: American Chemical Society (ACS)
Date: 20-02-2007
DOI: 10.1021/JA066205A
Abstract: We report a protocol for manipulating the surface composition of CdSe nanocrystals. By combining the successive ion layer adhesion and reaction (SILAR) method developed by Li et al. J. Am. Chem. Soc. 2003, 125, 12567 with a phosphine-free selenium precursor, the surface stoichiometry of CdSe can be tunably altered from Cd- to Se-rich. By changing the overall surface stoichiometry, we demonstrate ligand binding to specific surface sites. Tertiary phosphines produce a dramatic enhancement in photoluminescence quantum yield of CdSe particles with Se-rich surfaces but have little effect on Cd-rich surfaces. Unpassivated selenium surface sites are also shown to be a cause of the photobrightening behavior of CdSe nanocrystals.
Blinking and surface chemistry of single CdSe nanocrystals
Publisher: Wiley
Date: 09-01-2006
Enhanced photovoltaic performance of nanocrystalline CdTe/ZnO solar cells using sol-gel ZnO and positive bias treatment
Publisher: AIP Publishing
Date: 08-05-2014
DOI: 10.1063/1.4875381
Abstract: The effect of doping and porosity of the n-type ZnO layer on the performance of solution-processed, sintered p-CdTe/n-ZnO nanocrystal photovoltaic (PV) devices is investigated. Amorphous sol-gel ZnO is found to be the best candidate with overall energy conversion efficiencies above 8% obtained if the ZnO is also indium doped. We demonstrate that when such PV devices are left under forward bias (in dark or light), the device efficiency values are raised to at least 9.8%, due to a substantially increased open-circuit voltage and fill-factor. This drastic enhancement is attributed to improved band alignment at the ITO/CdTe interface. The forward-bias treatment is slowly reversed over a period of days to weeks on standing under open circuit conditions, but is readily restored with further voltage treatment. The moderate processing conditions and high efficiency of such devices demonstrate that nanocrystal-based systems are a promising technology for photovoltaics.
p-Type Layer Engineering of Hybrid Metal halide Perovskite Photovoltiacs
Publisher: OSA
Date: 2017
Ultra-thin high efficiency semitransparent perovskite solar cells
Publisher: Elsevier BV
Date: 04-2015
Photoinduced Charge Generation in a Molecular Bulk Heterojunction Material
Publisher: American Chemical Society (ACS)
Date: 19-11-2012
DOI: 10.1021/JA308949M
Abstract: Understanding the charge generation dynamics in organic photovoltaic bulk heterojunction (BHJ) blends is important for providing the necessary guidelines to improve overall device efficiency. Despite more than 15 years of experimental and theoretical studies, a universal picture describing the generation and recombination processes operating in organic photovoltaic devices is still being forged. We report here the results of ultrafast transient absorption spectroscopy measurements of charge photogeneration and recombination processes in a high-performing solution-processed molecular BHJ. For comparison, we also studied a high-performing polymer-based BHJ material. We find that the majority of charge carriers in both systems are generated on 30 nm) and is comparable with the phase-separated domain size. In addition, exciton diffusion to charge-separating heterojunctions is observed at longer times (1-500 ps). Finally, charge generation in pure films of the solution processed molecule was studied. Polarization anisotropy measurements clearly demonstrate that the optical properties are dominated by molecular (Frenkel) exictons and delocalized charges are promptly produced (t < 100 fs).
Cu2ZnGeS4 nanocrystals from air-stable precursors for sintered thin film alloys
Publisher: American Chemical Society (ACS)
Date: 23-09-2014
DOI: 10.1021/CM501393H
Sol-Gel Based Vertical Optical Microcavities with Quantum Dot Defect Layers
Publisher: Wiley
Date: 08-12-2008
Investigation into the Heterostructure Interface of CdSe-Based Core–Shell Quantum Dots Using Surface-Enhanced Raman Spectroscopy
Publisher: American Chemical Society (ACS)
Date: 11-07-2013
DOI: 10.1021/NN402022Z
Abstract: The structural nature of heterointerfaces in core-shell semiconductor quantum dots (QDs) plays a crucial role in tailoring their optical properties. In this work we have focused on using surface-enhanced Raman spectroscopy as a nondestructive tool to investigate the structural evolution of such interfaces in CdSe/CdS and CdSe/Cd0.5Zn0.5S colloidal QDs. A comparison between the two systems shows significant structural variation across the core-shell interfaces for the two different materials: a smooth interface for the former and an abrupt interface for the latter. This structural difference modifies the electronic structure within the QDs, which directly dictates the confinement behavior of the electrons and holes. The implications of this translate to a better understanding of why graded CdSe/CdS/Cd0.5Zn0.5S/ZnS QDs are so lucrative for linear and nonlinear fluorescence-based applications.
Ion Agglomeration and Transport in MgCl2 -Based Electrolytes for Rechargeable Magnesium Batteries
Publisher: American Chemical Society (ACS)
Date: 02-12-2019
DOI: 10.1021/ACS.JPCLETT.9B03023
Abstract: Magnesium halide salts are an exciting prospect as stable and high-performance electrolytes for rechargeable Mg batteries (RMBs). By nature of their complex equilibria, these salts exist in solution as a variety of electroactive species (EAS) in equilibrium with counterions such as AlCl
Role of Core–Shell Interfaces on Exciton Recombination in CdSe–CdxZn1–xS Quantum Dots
Publisher: American Chemical Society (ACS)
Date: 10-2014
DOI: 10.1021/JP506778N
Neural Electrodes Based on 3D Organic Electroactive Microfibers
Publisher: Wiley
Date: 11-08-2017
Abstract: Neural electrodes used for in vivo biomedical applications (e.g., prostheses, bionic implants) result in glial invasion, leading to the formation of a nonexcitable scar that increases the distance between neurons and electrode and increases the resistance to current flow. The result is progressive deterioration in the performance of stimulation or recording of neural activity and inevitable device failure. Also, electrodes with a 2D surface have a limited proximity to neurons. In the present study, a macroporous and fibrous 3D neural electrode is developed using poly‐L‐lactic acid fibrous membranes imbued with electroactive properties via a coating of the conductive polymer poly(3,4‐ethylenedioxythiophene) (PEDOT), using vapor phase polymerization. The electrical properties of the PEDOT‐coated substrates are studied using sheet resistance and impedance. PEDOT electrode biocompatibility is assessed through in vitro assays using patch‐cl electrophysiology and calcium imaging of isolated and cultured rat hippoc al neurons. PEDOT fibers support robust normal functional development of neurons, including synaptic networking and communication. Stimulation and recording of activity in brain slices and from the surface of the brain using 3D‐PEDOT fibrous electrodes are indistinguishable from recordings using conventional glass or platinum electrodes. In vivo studies reveal minimal reactive gliosis in response to electrode implantation.
Detection of Halomethanes Using Cesium Lead Halide Perovskite Nanocrystals
Publisher: American Chemical Society (ACS)
Date: 13-01-2021
Solution Processing of Next-Generation Nanocrystal Solar Cells
Publisher: SPIE
Date: 07-12-2013
DOI: 10.1117/12.2034067
Solution-Processed CuSbS2 Thin Films and Superstrate Solar Cells with CdS/In2S3 Buffer Layers
Publisher: American Chemical Society (ACS)
Date: 07-08-2020
A Solution‐Processed MoOx Anode Interlayer for Use within Organic Photovoltaic Devices
Publisher: Wiley
Date: 04-04-2012
Precursor Engineering of Lead Acetate-Based Precursors for High-Open-Circuit Voltage Wide-Bandgap Perovskite Solar Cells
Publisher: American Chemical Society (ACS)
Date: 10-04-2023
Semi-transparent perovskite solar cells with a cross-linked hole transport layer
Publisher: Elsevier BV
Date: 05-2020
Luminescence and Amplified Stimulated Emission in CdSe–ZnS‐Nanocrystal‐Doped TiO2 and ZrO2 Waveguides
Publisher: Wiley
Date: 09-05-2007
Sol-gel thin films for photonic application
Publisher: SPIE
Date: 06-2012
DOI: 10.1117/12.921685
The formation mechanism of Janus nanostructures in one-pot reactions: The case of Ag-Ag8 GeS6
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA00398B
Abstract: Using Ag–Ag 8 GeS 6 as a model system, a novel strategy for the formation of Ag-based Janus nanostructures is presented.
Intrinsic Green Fluorescent Cross-Linked Poly(ester amide)s by Spontaneous Zwitterionic Copolymerization
Publisher: American Chemical Society (ACS)
Date: 08-10-2021
High Activity Phosphine-Free Selenium Precursor Solution for Semiconductor Nanocrystal Growth
Publisher: American Chemical Society (ACS)
Date: 22-06-2010
DOI: 10.1021/CM903813R
Non-Aqueous One-Pot SnO2 Nanoparticle Inks and Their Use in Printable Perovskite Solar Cells
Publisher: American Chemical Society (ACS)
Date: 16-06-2022
Impact of Anion Impurities in Commercial PbI2 on Lead Halide Perovskite Films and Solar Cells
Publisher: American Chemical Society (ACS)
Date: 09-03-2021
Engineering of Semiconductor Nanocrystals for Light Emitting Applications
Publisher: MDPI AG
Date: 09-08-2016
DOI: 10.3390/MA9080672
Related Organisations
University Of California Santa Barbara
Location: United States of America
Related Funding Activities
Discovery Projects - Grant ID: DP110105341
Start Date: 04-2011
End Date: 04-2015
Amount: $245,538.00
Funder: Australian Research Council
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End Date: 06-2027
Amount: $689,098.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP220103783
Start Date: 12-2022
End Date: 12-2025
Amount: $423,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE200100168
Start Date: 06-2020
End Date: 09-2023
Amount: $550,000.00
Funder: Australian Research Council
View Funded ActivityARC Centres Of Excellence - Grant ID: CE170100026
Start Date: 07-2017
End Date: 06-2024
Amount: $31,850,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE190100116
Start Date: 06-2019
End Date: 12-2021
Amount: $809,000.00
Funder: Australian Research Council
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