A5088345363- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Conducting polymers and applications
- Organic Light-Emitting Diodes Research
- Semiconductor Quantum Structures and Devices
- Nanocluster Synthesis and Applications
- Advancements in Battery Materials
- Organic Electronics and Photovoltaics
- Semiconductor Lasers and Optical Devices
- ZnO doping and properties
- Supercapacitor Materials and Fabrication
- Semiconductor materials and interfaces
- Semiconductor materials and devices
- Advanced Battery Materials and Technologies
- Power Systems Fault Detection
- Power Systems and Technologies
- Advanced battery technologies research
- Molecular Junctions and Nanostructures
- Thin-Film Transistor Technologies
- Power Line Inspection Robots
- Neuroscience and Neural Engineering
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Battery Technologies Research
- Silicon and Solar Cell Technologies
Xi'an Jiaotong University
2023-2025
Nanomaterials Research (United States)
2025
State Key Laboratory of Electrical Insulation and Power Equipment
2025
China Southern Power Grid (China)
2024
TCL (China)
2022-2024
Monash University
2014-2023
Australian Research Council
2023
Laser Operations (United States)
2021
Materials Science & Engineering
2017
Australian Regenerative Medicine Institute
2017
A facile method to produce metal halide perovskite solar cells with improved stability and efficiency.
To industrialize printed full-color displays based on quantum-dot light-emitting diodes, one must explore the degradation mechanism and improve operational stability of blue electroluminescence. Here, we report that although state-of-the-art quantum dots, with monotonically-graded core/shell/shell structures, feature near-unity photoluminescence efficiency efficient charge injection, significant surface-bulk coupling at level, revealed by abnormal dipolar excited state, magnifies impact...
Abstract To date, the most efficient perovskite solar cells (PSCs) employ an n–i–p device architecture that uses a 2,2′,7,7′‐tetrakis( N , ‐di‐p‐methoxyphenyl‐amine)‐9,9′‐spirobifluorene (spiro‐OMeTAD) hole‐transporting material (HTM), which achieves optimum conductivity with addition of lithium bis(trifluoromethane)sulfonimide (LiTFSI) and air exposure. However, this additive along its oxidation process leads to poor reproducibility is detrimental stability. Herein, dicationic salt...
Hybrid organic-inorganic halide perovskites are low-cost solution-processable solar cell materials with photovoltaic properties that rival those of crystalline silicon. The perovskite films typically sandwiched between thin layers hole and electron transport materials, which efficiently extract photogenerated charges. This affords high-energy conversion efficiencies but results in significant performance fabrication challenges. Herein we present a simple charge layer-free (PSC), comprising...
ZnO-based electron-transporting layers (ETLs) have been universally used in quantum-dot light-emitting diodes (QLEDs) for high performance. The active surface chemistry of ZnO nanoparticles (NPs), however, leads to QLEDs with positive aging and unacceptably poor shelf stability. SnO2 is a promising candidate ETLs less reactivity, but NP agglomeration nonionic solvents makes the conventional device structure abandoned, resulting extremely low operational lifetimes. large barrier electron...
Top emission can enhance luminance, color purity, and panel-manufacturing compatibility for emissive displays. Still, top-emitting quantum-dot light-emitting diodes (QLEDs) suffer from poor stability, low light outcoupling, non-negligible viewing-angle dependence because, QLEDs with non-red emission, the electrically optimum device structure is incompatible single-mode optical microcavity. Here, we demonstrate that by improving way of determining reflection penetration depths creating...
Limited stability of blue quantum dot light-emitting diodes (QLEDs) under current stress impedes commercialization. Multi-layer structures the state-of-the-art QLEDs pose significant difficulty in fundamental understanding degradation mechanisms. Here, by applying transient electroluminescence measurements, we disentangle charge transport both pristine and degraded QLEDs. By varying thicknesses layers emissive layer, respectively, show that is primarily dominated holes. Furthermore,...
Electron-transport-layer-free (ETL-free) perovskite solar cells (PSCs) show great promise for commercialization due to their simple design and ease of fabrication. However, the interface between transparent conductive oxides such as indium-doped tin oxide (ITO) is not optimal differences in work functions, surface defects, wettability substrates. Surface modification ITO through self-assembled monolayers (SAMs) get ITO/SAM charge selective layers has shown improvement device performance...
Nb2O5 has been viewed as a promising anode material for lithium-ion batteries by virtue of its appropriate redox potential and high theoretical capacity. However, it suffers from poor electric conductivity low ion diffusivity. Herein, we demonstrate the controllable fabrication Cu-doped with orthorhombic (T-Nb2O5) monoclinic (H-Nb2O5) phases through annealing solvothermally presynthesized precursor under different temperatures in air, Cu doping amount can be readily controlled concentration...
Inefficient hole injection presents a major challenge in achieving stable and commercially viable solution-processed blue electroluminescent devices. Here, we conduct an in-depth study on quantum-dot light-emitting diodes (QLEDs) to understand how the energy levels of common electrodes hole-transporting layers (HTL) affect device degradation. Our experimental findings reveal design rule that may seem nonintuitive: combining electrode HTL with matched is most effective preventing voltage rise...
Abstract Incorporating interdigitated back‐contact electrodes into organic–inorganic halide perovskite solar cells overcomes the optical losses and low architectural defect tolerance present in conventional “sandwich” cell configurations. However, other factors limit device performance architectures, such as short charge‐carrier diffusion length within film relative to electrode spacing. As is crystal‐size related, order understand effect of morphology on (bc‐PSCs), films with four different...
The operational stability of the blue quantum dot light-emitting diode (QLED) has been one most important obstacles to initialize its industrialization. In this work, we demonstrate a machine learning assisted methodology illustrate QLEDs by analyzing measurements over 200 samples (824 QLED devices) including current density–voltage–luminance (J-V-L), impedance spectra (IS), and lifetime (T95@1000 cd/m2). is able predict with Pearson correlation coefficient 0.70 convolutional neural network...
Abstract As the performance of organic–inorganic halide perovskite solar cells approaches their practical limits, use back‐contact architectures, which eliminate parasitic light absorption, provides an effective route toward higher device efficiencies. However, a poor understanding underlying physics has limited further improvements. Here mesoporous charge‐transporting layer is introduced into quasi‐interdigitated devices and charge extraction behavior with increased interfacial contact area...
Abstract The shelf-stability issue, originating from the ZnO-induced positive aging effect, poses a significant challenge to industrializing display technology based on solution-processed quantum-dot light-emitting diodes (QLEDs). Currently, none of proposed solutions can simultaneously inhibit exciton quenching caused by ZnO-based electron-transporting layer (ETL) and retain other advantages ZnO. Here in this work, we propose bilayer design ETL which buffer assembled SnO 2 nanoparticles...
Abstract The efficiency of back‐contact perovskite solar cells has steadily increased over the past few years and now exceeds 11%, with interest in these devices shifting from proof‐of‐concept to viable technology. In order make further improvements it is necessary understand cause low fill factor, open‐circuit voltage ( V OC ), severe hysteresis. Here a time‐dependent Suns‐ oc Suns‐photoluminescence (PL) analysis are performed monitor transient ideality factor spatially. Two sets...
Back-contact architectures offer a promising route to improve the record efficiencies of perovskite solar cells (PSCs) by eliminating parasitic light absorption. However, performance back-contact PSCs is limited inadequate carrier diffusion in perovskite. Here, we report that films with preferred out-of-plane orientation show improved dynamic properties. With addition guanidine thiocyanate, exhibit lifetimes and mobilities increased 3-5 times, leading lengths exceeding 7 μm. The enhanced...
Abstract Although quantum dot light‐emitting diodes (QLEDs) are extensively studied nowadays, their charge transport mechanism remains a subject of ongoing debate. Here, the hole in blue dots (QDs) (CdZnSe/ZnSe/ZnS/CdZnS/ZnS based) is investigated by combining current‐voltage and transient electroluminescence measurements. The study demonstrates that QD thin films characterized trap‐free space‐charge‐limited current with zero‐field room temperature mobility 4.4 × 10 −11 m 2 V −1 s ....
Electroluminescent quantum-dot light-emitting diodes (QLEDs) are a promising technology for next-generation display applications. Currently, the performance of red- and green-light-emitting QLED devices is close to standard industrialization. However, blue-light-emitting QLEDs lagging behind due insufficient charge injection. Herein we present simple postannealing treatment that leads significant enhancement in device efficiency by approximately 20%. Enhanced injection improved balance...