ORCID Profile
0000-0002-3214-4661
Current Organisation
Tsinghua University
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Publisher: Wiley
Date: 20-02-2022
Abstract: Extensive progress has been made on the application of organic semiconductors (OSCs) in organic field‐effect transistors (OFETs) however, low reproducibility and poor stability of OSCs have limited their industrial applications. One potential strategy to overcome these limitations is to blend OSCs with insulating commodity polymers. The resultant bicomponent blends can be used to fabricate OFETs with low cost, high performance, and long‐time retention. In addition, insulator blending is also identified as a facile and effective approach to enhance the OSC properties, with some unexpected features even superior to neat OSCs. Herein, the present advances of OSCs/insulator blends in the OFET configuration are reviewed. The perspectives on the intrinsic properties of insulator blends, including morphology and trap elimination, are presented for the purpose of strategic device optimization. Accordingly, the effect of different insulator components on device performance is also discussed.
Publisher: Elsevier BV
Date: 09-2021
Publisher: Springer Science and Business Media LLC
Date: 24-04-2018
DOI: 10.1038/S41598-018-24632-4
Abstract: The typical conductive polymer of PEDOT:PSS has recently attracted intensive attention in thermoelectric conversion because of its low cost and low thermal conductivity as well as high electrical conductivity. However, compared to inorganic counterparts, the relatively poor thermoelectric performance of PEDOT:PSS has greatly limited its development and high-tech applications. Here, we report a dramatic enhancement in the thermoelectric performance of PEDOT:PSS by constructing unique composite films with graphene quantum dots (GQDs). At room temperature, the electrical conductivity and Seebeck coefficient of PEDOT:PSS/GQDs reached to 7172 S/m and 14.6 μV/K, respectively, which are 30.99% and 113.2% higher than those of pristine PEDOT:PSS. As a result, the power factor of the optimized PEDOT:PSS/GQDs composite is 550% higher than that of pristine PEDOT:PSS. These significant improvements are attributed to the ordered alignment of PEDOT chains on the surface of GQDs, originated from the strong interfacial interaction between PEDOT:PSS and GQDs and the separation of PEDOT and PSS phases. This study evidently provides a promising route for PEDOT:PSS applied in high-efficiency thermoelectric conversion.
Publisher: Springer Science and Business Media LLC
Date: 02-03-2016
DOI: 10.1038/SREP22494
Abstract: Y-shaped ZnO nanobelts are fabricated by a simple thermal evaporation method. Transmission Electron Microscopy (TEM) investigation shows that these ZnO nanobelts are crystals with twinned planes {11–21}. Convergent Beam Electron Diffraction studies show that the two sides of twinned nanobelts are O-terminated towards the twinned boundary and Zn-terminated outwards. The two branches of twinned ZnO nanobelts grow along [11–26] from the trunk and then turn to the polarization direction [0001]. The featured Y-shape morphology and TEM characterizations indicate that the growth of these novel nanostructures is driven by an unusual twinned dislocation growth mechanism.
Publisher: Elsevier BV
Date: 09-2017
Publisher: AIP Publishing
Date: 24-08-2020
DOI: 10.1063/5.0020597
Abstract: Single-crystalline vanadium dioxide nanowires (VO2 NWs) have attracted significant interest due to their unique characteristics, which originate from the single-domain metal–insulator phase transition (MIT) property. However, the lack of facile technologies to produce vertical nanowire arrays (NAs) in a large area has limited the mass fabrication of VO2-based devices. Here, an antimony-assisted hydrothermal method is developed for the low-temperature production of wafer-scale vertical VO2 NAs on arbitrary substrates of glass, quartz, and silicon. Sb2O3 plays a key role in the controlled growth of pure VO2 (M1) by modulating the size, density, alignment, and MIT properties of VO2 NAs. Furthermore, the growth mechanism of vertical VO2 NAs is explained. In contrast to conventional fabrication technologies, the weak interaction between NA films and substrates enables a much easier transfer of VO2 NAs for various potential applications.
Publisher: Wiley
Date: 11-10-2023
DOI: 10.1111/REC.13787
Abstract: Seagrass restoration requires information on a range of factors including site environmental conditions, appropriate planting techniques, and the identification of sites most likely to support seagrass. To address the question of where to focus restoration efforts, a key first step is to identify trends in the spatio‐temporal distribution of seagrasses to identify areas of persistence, loss, and recent gains. Areas of recent recovery (and adjacent areas), can then be targeted by practitioners for assisted recovery and restoration, whilst areas of persistent loss can be avoided. Here we identified the contemporary distribution, density, and species composition of seagrass ecosystems (using Sentinel 2 imagery and supervised object‐based imagery analysis) and integrated these data with historic extents to identify spatio‐temporal trends in seagrass distribution in Western Port, Victoria, Australia. Contemporary classifications demonstrated acceptable accuracies (Overall Accuracy 0.77–0.85, User Accuracy 0.76–0.97) and predicted a contemporary seagrass extent of 222 km 2 with 48 km 2 of low‐density recovery predicted to have occurred since 1999. Comparisons with historical seagrass extents indicated some seagrass recovery since large‐scale losses in 1983, although some areas of loss were also present. Recovery included a net gain of approximately 95 km 2 in the past 20 years and an eastward range expansion suggesting environmental conditions have improved and are now conducive for restoration efforts in some areas. Results demonstrate that accurate, low‐cost, remote sensing of seagrass ecosystems is possible and show how understanding spatio‐temporal trends can guide the spatial allocation of resources by prioritizing areas for restoration where recovery is beginning to occur.
Publisher: Elsevier BV
Date: 02-2022
Publisher: American Chemical Society (ACS)
Date: 20-12-2016
Abstract: Monolayer MoS
Publisher: Springer Science and Business Media LLC
Date: 09-07-2021
DOI: 10.1038/S41467-021-24527-5
Abstract: A systematic study of various metal-insulator transition (MIT) associated phases of VO 2 , including metallic R phase and insulating phases (T, M1, M2), is required to uncover the physics of MIT and trigger their promising applications. Here, through an oxide inhibitor-assisted stoichiometry engineering, we show that all the insulating phases can be selectively stabilized in single-crystalline VO 2 beams at room temperature. The stoichiometry engineering strategy also provides precise spatial control of the phase configurations in as-grown VO 2 beams at the submicron-scale, introducing a fresh concept of phase transition route devices. For instance, the combination of different phase transition routes at the two sides of VO 2 beams gives birth to a family of single-crystalline VO 2 actuators with highly improved performance and functional ersity. This work provides a substantial understanding of the stoichiometry-temperature phase diagram and a stoichiometry engineering strategy for the effective phase management of VO 2 .
Publisher: American Chemical Society (ACS)
Date: 11-08-2022
Abstract: The depletion of fossil fuels and rapidly increasing environmental concerns have urgently called for the utilization of clean and sustainable sources for future energy supplies. Hydrogen (H
Publisher: Wiley
Date: 25-04-2022
Abstract: High crystallization and conductivity are always required for inorganic carrier transport materials for cheap and high‐performance inverted perovskite solar cells (PSCs). High temperature and external doping are inevitably introduced and thus greatly h er the applications of inorganic materials for mass production of flexible and tandem devices. Here, an amorphous and dopant‐free inorganic material, Ni 3+ ‐rich NiO x , is reported to be fabricated by a novel UV irradiation strategy, which is facile, easily scaled‐up, and energy‐saving because all the processing temperatures are below 82 ℃. The as‐prepared NiO x film shows highly improved conductivity and hole extraction ability. The rigid and flexible PSCs present the ch ion efficiencies of 22.45% and 19.7%, respectively. This work fills the gap of preparing metal oxide films at the temperature below 150 °C for inverted PSCs with the high efficiency of %. More importantly, this work upgrades the substantial understanding about inorganic materials to function well as efficient carrier transport layers without external doping and high crystallization.
Publisher: American Chemical Society (ACS)
Date: 16-06-2021
Publisher: Wiley
Date: 10-05-2020
Publisher: Elsevier BV
Date: 12-2020
Publisher: Springer Science and Business Media LLC
Date: 04-02-2015
DOI: 10.1038/SREP08226
Abstract: Hierarchical ZnO nanostructures with a large yield were fabricated by a simple thermal evaporation method. For the first time, novel ZnO flowers were observed blooming at certain sites of a variety of spines, identified as Zn-terminated polar (0001) planes or tips. The spines for as-synthesized hierarchical structures can be nanowires, nanobelts, nanodendrites, nanobrushes, etc. This growth phenomenon determines the key role of polar sites in the fabrication of hierarchical structures. The spiral feature of ZnO flowers indicates an unusual screw dislocation driven growth mechanism, which is attributed to a high concentration of Zn vapor.
Publisher: Wiley
Date: 13-10-2021
Abstract: Stress/strain engineering is believed to be an effective way to adjust the thermal conductivity of materials dynamically or as needed. Compared with bulk materials, micro‐/nanoscale structures can withstand greater stress/deformations that lead to evident changes in their thermal conductivity after undergoing stress/strain this phenomenon has been predicted by theoretical simulations. Nevertheless, measuring the effective thermal conductivity of a single wire of a small size upon controllable bending angles has faced major challenges. Herein, a method using VO 2 tag as a temperature indicator is developed to achieve the in situ quantitative measurement of the thermal conductivity of bent silicon microwires (MWs), where thermally insulated spider silk is used to adjust the position of the suspended end of wires for different bending angles. It is found that the thermal conductivity of Si wires increases and then decreases upon subsequent bending it indicates that the thermal conductivity of MWs can be dynamically tuned by bending. Further studies reveal that the variation of thermal conductivity is reversible with small bending (elastic) and irreversible with large bending (plastic). With this setup, new thermophysical properties of materials are explored at small scales, and possible stress/strain‐gated thermal switches emerge.
Publisher: American Chemical Society (ACS)
Date: 30-10-2019
Publisher: American Chemical Society (ACS)
Date: 20-12-2017
Abstract: Morphology management for tailoring the properties of monolayer transition-metal dichalcogenides (TMDCs), that is, molybdenum disulfide (MoS
Publisher: American Chemical Society (ACS)
Date: 05-04-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA02017A
Abstract: MOFs derived ZnCo–Fe nanocages are synthesized by a self-templated approach showing the remarkable performance for OER catalysts.
Publisher: Wiley
Date: 20-03-2019
Publisher: Springer Science and Business Media LLC
Date: 16-08-2018
DOI: 10.1038/S41598-018-29652-8
Abstract: Hierarchical nanostructures are ideal architectures to harvest solar energy. The understanding of light absorption in single hierarchical structures is emergently important and greatly helpful in enhancing multiscale optical phenomena and light management. However, due to the geometrical complexity of hierarchical architectures, theoretical and experimental studies of light absorption have faced significant challenges. Here, we directly quantify light absorption in single hierarchical structures for the first time by utilizing VO 2 -based near field powermeter. It is found that light trapping is significantly enhanced in rough microwires when the roughness litude is comparable to the incident light wavelength. The roughness enhanced light absorption is verified as a general phenomenon on both VO 2 and Si hierarchical structures. Therefore, our work not only provides a simple and quantitative method of measuring light absorption upon single geometrically complex structures in micro/nanoscale, but also contributes a general rule to rationally design of hierarchical structures for enhanced performance in photoelectric and photochemical applications.
Publisher: Wiley
Date: 19-08-2022
Abstract: Fabricating perovskite solar cells (PSCs) in air is conducive to low‐cost commercial production nevertheless, it is rather difficult to achieve comparable device performance as that in an inert atmosphere because of the poor moisture toleration of perovskite materials. Here, the perovskite crystallization process is systematically studied using two‐step sequential solution deposition in an inert atmosphere (glovebox) and air. It is found that moisture can stabilize solvation intermediates and prevent their conversion into perovskite crystals. To address this issue, thermal radiation is used to accelerate perovskite crystallization for integrated perovskite films within 10 s in air. The as‐formed perovskite films are compact, highly oriented with giant grain size, superior photoelectric properties, and low trap density. When the films are applied to PSC devices, a ch ion power conversion efficiency (PCE) of 20.8% is obtained, one of the best results for air‐processed inverted PSCs under high relative humidity (60 ± 10%). This work substantially assists understanding and modulation to perovskite crystallization kinetics under heavy humidity. Also, the ultrafast conversion strategy by thermal radiation provides unprecedented opportunities to manufacture high‐quality perovskite films for low‐temperature, eco‐friendly, and air‐processed efficient inverted PSCs.
Publisher: Elsevier BV
Date: 12-2020
Publisher: American Chemical Society (ACS)
Date: 20-07-2021
Publisher: Springer Science and Business Media LLC
Date: 05-01-2016
DOI: 10.1038/SREP18886
Abstract: Ordered nanoarchitectures have attracted an intense research interest recently because of their promising device applications. They are always fabricated by self-assembling building blocks such as nanowires, nanodots. This kind of bottom up approaches is limited in poor control over height, lateral resolution, aspect ratio and patterning. Here, we break these limits and realize 3D sculpturing of vertical ZnO nanowire arrays (NAs) based on the conventional photolithography approach. These are achieved by immersing nanowire NAs in thick photoresist (PR) layers, which enable the cutting and patterning of ZnO NAs as well as the tailoring of NAs. Our strategy of 3D sculpturing of NAs promisingly paves the way for designing novel NAs-based nanoarchitectures.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8TA11071A
Abstract: Hysteresis behaviour of metal–insulator transition in VO 2 enables reduced energy consumption for high-performance Joule heating driven flexible smart windows.
Publisher: American Chemical Society (ACS)
Date: 03-06-2020
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 03-2021
Publisher: Wiley
Date: 29-11-2022
Abstract: Chemical vapor deposition (CVD) has been widely used to produce high quality 2D transitional metal dichalcogenides (2D TMDCs). However, violent evaporation and large diffusivity discrepancy of metal and chalcogen precursors at elevated temperatures often result in poor regulation on X:M molar ratio (M = Mo, W etc. X = S, Se, and Te), and thus it is rather challenging to achieve the desired products of 2D TMDCs. Here, a modified spatially confined strategy (MSCS) is utilized to suppress the rising S vapor concentration between two aspectant substrates, upon which the lateral/vertical growth of 2D WS 2 can be selectively regulated via proper S:W zones correspond to greatly broadened time/growth windows. An S:W‐time (SW‐T) growth diagram was thus proposed as a mapping guide for the general understanding of CVD growth of 2D WS 2 and the design of growth routes for the desired 2D WS 2 . Consequently, a comprehensive growth management of atomically thin WS 2 is achieved, including the versatile controls of domain size, layer number, and lateral/vertical heterostructures (MoS 2 ‐WS 2 ). The lateral heterostructures show an enhanced hydrogen evolution reaction performance. This study advances the substantial understanding to the growth kinetics and provides an effective MSCS protocol for growth design and management of 2D TMDCs.
Publisher: American Chemical Society (ACS)
Date: 25-02-2020
Publisher: American Chemical Society (ACS)
Date: 27-07-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1NA00171J
Abstract: Wafer-scale TMD films are fabricated via CVD method, controlling precursor concentration, nucleation density and orientated growth. Precursor concentration is important for the ideal film. Nucleation and orientated growth allow large domain size or single crystalline TMDs.
Publisher: AIP Publishing
Date: 03-2019
DOI: 10.1063/1.5087864
Abstract: Vanadium dioxide (VO2), with the first-order metal-insulator phase transition at near room temperature, has attracted increasing attention in the past few decades. With rapid electrical switching, the phase transition in VO2 also triggers the colossal property changes in various aspects, such as optical properties, magnetic properties, and strain, and, thus, enables a wide range of modern applications. In this review, we present a complete picture of the latest advances of VO2, including the fabrication strategies, property modulation, and advanced applications. This review summarizes several typical fabrication methods of VO2 crystals as well as some common problems and their possible solutions. The strategies for the fabrication of single-crystalline VO2 arrays are also discussed to meet the requirements of the high-performance devices at the macro-scale. This review concerns the typical approaches for the modulation of (metal-insulator transition) MIT and emphasizes on the domain study of VO2 single crystals at the nanoscale. We aim at a clear explanation of the effect of various inhomogeneities on the MIT behavior of VO2 and the importance of the accurate control of MIT at the domain level. After summarizing the preparation and modification of VO2, we focus on the applications of this amazing smart material in various aspects, including strain engineering, optical modulation, electrical switching, and multi-responsive sensing.
No related grants have been discovered for Run Shi.