A5002958517- Fusion materials and technologies
- Ion-surface interactions and analysis
- Perovskite Materials and Applications
- Nuclear Materials and Properties
- Quantum Dots Synthesis And Properties
- Advanced materials and composites
- Metal and Thin Film Mechanics
- Conducting polymers and applications
- Advanced ceramic materials synthesis
- Organic Light-Emitting Diodes Research
- Thin-Film Transistor Technologies
- 2D Materials and Applications
- Silicon and Solar Cell Technologies
- MXene and MAX Phase Materials
- Aluminum Alloys Composites Properties
- Semiconductor materials and devices
- Hydrogen embrittlement and corrosion behaviors in metals
- Organic Electronics and Photovoltaics
- Chalcogenide Semiconductor Thin Films
- Microstructure and mechanical properties
- High-Temperature Coating Behaviors
- Photorefractive and Nonlinear Optics
- Integrated Circuits and Semiconductor Failure Analysis
- Nuclear materials and radiation effects
- Silicon Carbide Semiconductor Technologies
National University of Defense Technology
2025
Institute of Modern Physics
2015-2024
Chinese Academy of Sciences
2015-2024
University of Chinese Academy of Sciences
2012-2024
Xi'an Shiyou University
2024
Nanjing University of Science and Technology
2024
Ji Hua Laboratory
2024
Henan Normal University
2019-2023
Hengyang Normal University
2022
Xinxiang University
2020
Device performance and in particular device stability for blue perovskite light-emitting diodes (PeLEDs) remain considerable challenges the whole community. In this manuscript, we conceive an approach by tuning 'A-site' cation composition of perovskites to develop blue-emitters. We herein report a Rubidium-Cesium alloyed, quasi-two-dimensional demonstrate its great potential pure-blue PeLED applications. Composition engineering in-situ passivation are conducted further improve material's...
Abstract Rapid Auger recombination represents an important challenge faced by quasi-2D perovskites, which induces resulting perovskite light-emitting diodes’ (PeLEDs) efficiency roll-off. In principle, rate is proportional to materials’ exciton binding energy ( E b ). Thus, can be suppressed reducing the corresponding . Here, a polar molecule, p -fluorophenethylammonium, employed generate perovskites with reduced Recombination kinetics reveal does decrease one-order-of magnitude lower...
Abstract Reduced-dimensional (quasi-2D) perovskite materials are widely applied for photovoltaics due to their remarkable environmental stability. However, device performance still lags far behind traditional three dimensional perovskites, particularly high open circuit voltage ( V oc ) loss. Here, inhomogeneous energy landscape is pointed out be the sole reason, which introduces extra loss, creates band tail states and inhibits minority carrier transport. We thus propose form homogeneous...
Serious performance decline arose for perovskite light-emitting diodes (PeLEDs) once the active area was enlarged. Here we investigate failure mechanism of widespread film fabrication method; and ascribe severe phase-segregation to be reason. We thereby introduce L-Norvaline construct a COO
Great successes have been achieved in developing perovskite light-emitting devices (LEDs) with blue, green, red, and near-infrared emissions. However, as key optoelectronic devices, yellow-colored LEDs remain challenging, mainly due to the inevitable halide separation mixed perovskites under high bias, causing undesired color change of devices. In addition this color-missing problem, intrinsic toxicity poor stability conventional lead-halide also restrict their practical applications. We...
Chiral quasi-2D perovskite single crystals (SCs) were investigated for their circular polarized light (CPL) detecting capability. Quasi-2D chiral perovskites, [(R)-β-MPA]2 MAPb2 I7 ((R)-β-MPA=(R)-(+)-β-methylphenethylamine, MA=methylammonium), have intrinsic chirality and the capability to distinguish different polarization states of CPL photons. Corresponding SCs photodetector exhibit excellent detection performance. In particular, our device responsivity is almost one order magnitude...
Quasi-2D perovskites, composed of self-organized quantum well structures, are emerging as gain materials for laser applications. Here we investigate the influence domain distribution on emission CsPbCl1.5Br1.5-based quasi-2D perovskites. The use 2,2-diphenylethylammonium bromide (DPEABr) a ligand enables formation film with large-n-dominated narrow distribution. Due to reduced content small-n domains, incomplete energy transfer from large-n domains can be greatly addressed. Moreover,...
Mixed-halide perovskites are considered the most straightforward candidate to realize blue perovskite light-emitting diodes (PeLEDs). However, they suffer severe halide migration, leading spectral instability, which is particularly exaggerated in high chloride alloying perovskites. Here, we demonstrate energy barrier of migration can be tuned by manipulating degree local lattice distortion (LLD). Enlarging LLD a suitable level increase barrier. We herein report an "A-site" cation engineering...
Low-dimensional metal halides (LDMHs), especially lead-based perovskites, have recently attracted a great deal of attention for their unique structures and optoelectronic properties. However, the toxicity lead limits practical applications. Herein, lead-free one-dimensional copper-based halide [KC2]2[Cu4I6] (C = 12-crown-4 ether) was constructed, which exhibits greenish-yellow emission (545 nm) with near-unity photoluminescence quantum yield (∼97.8%). To best our knowledge, this is highest...
Abstract 2D Ruddlesden–Popper perovskites (RPPs) have recently drawn significant attention because of their structural variability that can be used to tailor optoelectronic properties and improve the stability derived photovoltaic devices. However, charge separation transport in perovskite solar cells (PSCs) suffer from quantum well barriers formed during processing perovskites. It is extremely difficult manage phase distributions made stoichiometric mixtures precursor solutions. Herein, a...
Abstract Chiral quasi‐2D perovskite single crystals (SCs) were investigated for their circular polarized light (CPL) detecting capability. Quasi‐2D chiral perovskites, [( R )‐β‐MPA] 2 MAPb I 7 (( )‐β‐MPA=( )‐(+)‐β‐methylphenethylamine, MA=methylammonium), have intrinsic chirality and the capability to distinguish different polarization states of CPL photons. Corresponding SCs photodetector exhibit excellent detection performance. In particular, our device responsivity is almost one order...
Mixed-halide perovskites show tunable emission wavelength across the visible-light range, with optimum control of light color. However, color stability remains limited due to notorious halide segregation under illumination or an electric field. Here, a versatile path toward high-quality mixed-halide high properties and resistance is presented. Through systematic in ex situ characterizations, key features for this advancement are proposed: slowed controllable crystallization process can...
Abstract Organic solar cells (OSCs) exhibit complex charge dynamics, which are closely correlated with the dielectric constant (ɛ r ) of photovoltaic materials. In this work, a series novel conjugated copolymers based on benzo[1,2‐b:4,5‐b′]difuran (BDF) and benzotriazole (BTz) is designed synthesized, differ by nature π‐bridge from one another. The PBDF‐TF‐BTz asymmetric furan thiophene demonstrates larger ɛ 4.22 than PBDF‐dT‐BTz symmetric (3.15) PBDF‐dF‐BTz (3.90). also offers more...
Fused-ring electron donors boost the efficiency of organic solar cells (OSCs), but they suffer from high cost and low yield for their large synthetic complexity (SC > 30%). Herein, authors develop a series simple non-fused-ring donors, PF1 PF2, which alternately consist furan-3-carboxylate 2,2'-bithiophene. Note that PF2 present very small SC 9.7% inexpensive raw materials, facile synthesis, yield. Compared to all-thiophene-backbone counterpart PT-E, two new polymers feature larger...