A5048508815- Perovskite Materials and Applications
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- Organic Electronics and Photovoltaics
- Chalcogenide Semiconductor Thin Films
- ZnO doping and properties
- Copper-based nanomaterials and applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Organic Light-Emitting Diodes Research
- Solid-state spectroscopy and crystallography
- Molecular Junctions and Nanostructures
- Thin-Film Transistor Technologies
- Advanced Photocatalysis Techniques
- Luminescence Properties of Advanced Materials
- 2D Materials and Applications
- Photonic and Optical Devices
- Electronic and Structural Properties of Oxides
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Semiconductor materials and devices
- Nanocluster Synthesis and Applications
- Fullerene Chemistry and Applications
- Chinese history and philosophy
- Advancements in Battery Materials
- GaN-based semiconductor devices and materials
Nanjing University
2025
University of Washington
1996-2024
Shandong University
2021-2024
Georgia Institute of Technology
2023
Tsinghua University
2006-2023
Joint Laboratory for Extreme Conditions Matter Properties
2023
Southwest University of Science and Technology
2023
Inner Mongolia University
2010-2022
Washington University in St. Louis
2022
PLA Army Service Academy
2022
Quasi-2D perovskites are attractive because of their improved stability compared to 3D counterparts, but they suffer from reduced performance. Here we report an efficient quasi-2D perovskite (PEA)2(MA)4Pb5I16-based optoelectronic device processed with NH4SCN and NH4Cl additives, showing a stabilized photovoltaic power conversion efficiency as high 14.1% (average value 12.9 ± 0.8%), which is among the highest-performing solar cells. These additives increase crystallinity induce preferred...
Room temperature X-ray photoelectron spectroscopy (XPS), inductively coupled plasma mass spectrometry (ICPMS), high resolution Rutherford backscattering (HR-RBS), Kelvin probe method, and scanning tunneling microscopy (STM) are employed to study the properties of a freshly exfoliated surface geological MoS2 crystals. Our findings reveal that semiconductor 2H-MoS2 exhibits both n- p-type behavior, work function as measured by is found vary from 4.4 5.3 eV. The presence impurities in...
In this work, we demonstrate the growth of HfSe2 thin films using molecular beam epitaxy. The relaxed criteria have allowed us to layered, crystalline without misfit dislocations on other 2D substrates such as highly ordered pyrolytic graphite and MoS2. exhibit an atomically sharp interface with used, followed by flat, layers octahedral (1T) coordination. resulting is slightly n-type indirect band gap ∼1.1 eV a measured energy alignment significantly different from recent DFT calculations....
We explore the effects of nonradiative recombination at extracting contacts on achievable performance halide perovskite photovoltaic cells. First, we perform device simulations using standard drift-diffusion models with experimental semiconductor parameters matching those methylammonium lead triiodide (MAPbI3). quantify range surface velocities (SRVs) that would allow this archetypal to reach power conversion efficiencies 27%. In particular, for well-aligned energy levels, SRVs ∼1–10 cm/s...
A delafossite CuCrO<sub>2</sub>hole transport layer deposited at room temperature from a nanoparticle suspension is used in efficient perovskite cells.
We show that adding ethylenediamine (EDA) to perovskite precursor solutions improves the photovoltaic device performance and material stability of high-bromide-content, methylammonium-free, formamidinium cesium lead halide perovskites FA1–xCsxPb(I1–yBry)3, which are currently interest for perovskite-on-Si tandem solar cells. Using spectroscopy hyperspectral microscopy, we additive film homogeneity suppresses phase instability is ubiquitous in high-Br formulations, producing films remain...
We demonstrate reduced surface recombination velocity (SRV) and enhanced power-conversion efficiency (PCE) in mixed-cation mixed-halide perovskite solar cells by using (3-aminopropyl)trimethoxysilane (APTMS) as a passivator. show the APTMS serves to passivate defects at surface, while also decoupling from detrimental interactions C60 interface. measure SRV of ∼125 ± 14 cm/s, concomitant increase ∼100 meV quasi-Fermi level splitting passivated devices compared controls. use time-resolved...
We used site-directed mutagenesis of rabbit muscle aldolase, falling ball viscometry, co-sedimentation binding assays, and negative stain electron microscopy, to identify specific residues involved in the aldolase-actin interaction. Three mutants, R42A (Arg → Ala), K107A (Lys R148A had minimal actin activity relative wild type (wt) one mutant, K229A intermediate activity. A mutant with ~4,000-fold reduced catalytic activity, D33S (Asp Ser), normal The aldolase substrates product, fructose...
Abstract Cu 2 O p-type semiconductor hollow porous microspheres have been prepared by using a simple soft-template method at room temperature. The morphology of as-synthesized samples is spherical structures with the diameter ranging from 200 to 500 nm, and surfaces spheres are rough, lots channels folds. photocatalytic activity degradation methyl orange (MO) under visible light irradiation was investigated UV-visible spectroscopy. results show that particles were uniform in diameters an...
High performance hole transport layers are realized using room temperature solution processing of microwave-synthesized MoOx nanoparticles. Composition solution-deposited nanoparticle films can be increased from 10% to 70% MoO3 air exposure (days) and reaction with H2O2 (minutes). The content correlates well improved solar cell performanceto the level evaporated PEDOT:PSS, good stability.
CuS caved superstructures with a variety of sizes and regular shapes were synthesized by an innovative one-pot method, which showed excellent catalytic properties evaluated degradation methylene blue (MB) without light.
Abstract Structure reorganization within perovskite materials has attracted much attention due to its assisted appealing features in optoelectronic devices, such as achieving continue‐wave laser and performance enhancement photovoltaic devices. Unfortunately, the difficulty of controlling processing unclear underlying mechanisms impose an impediment for taking advantage structural pursuit distinctive functions perovskite‐based In this work, using above‐bandgap illumination with a small...
p-Type metal-oxide hole transport layer (HTL) suppresses recombination at the anode and hence improves organic photovoltaic (OPV) device performance. While NiOx has been shown to exhibit good HTL performance, very thin films (<10 nm) are needed due its poor conductivity high absorption. To overcome these limitations, we utilize CuGaO2, a p-type transparent conducting oxide, as for OPV devices. Pure delafossite phase CuGaO2 nanoplates synthesized via microwave-assisted hydrothermal reaction...
Abstract Perovskite light emitting devices have been expected to be utilized in the field of displays. In this work, a stable FA 0.3 Cs 0.7 PbBr 3 perovskite quantum dot ink with optimized octane:dodecane cosolvent is obtained by introducing trace amount long‐chain ligand oleylamine (OAm) during purification process. A green electroluminescent matrix device 120 pixels per inch (PPI) realized from using an inkjet printing technique, exhibiting luminance 1233 cd m −2 , peak current efficiency...
We control surface recombination in the mixed-cation, mixed-halide perovskite, FA0.83Cs0.17Pb(I0.85Br0.15)3, by passivating nonradiative defects with polymerizable Lewis base (3-aminopropyl)trimethoxysilane (APTMS). demonstrate average minority carrier lifetimes >4 μs, nearly single exponential monomolecular photoluminescence decays, and high external quantum efficiencies (>20%, corresponding to ∼97% of maximum theoretical quasi-Fermi-level splitting) at low excitation fluence. confirm both...
Bimolecular recombination is often a major photogenerated charge carrier loss mechanism in organic photovoltaic (OPV) devices, resulting lower fill factor (FF) compared to inorganic devices. The parameter α can be obtained from the power law fitting of short-circuit current (Jsc) on illumination intensity (I), Jsc∝Iα, with values less than unity taken as an indication reduced photon-to-electron extraction efficiency and presence bimolecular OPV. Here, we show that this intensity-averaged...
We studied the competition between energy loss due to quenching and enhanced absorption arising from near-field plasmonic effect of Au nanoparticles (NPs) on performance organic solar cells (OSCs), by fabricating inverted architecture OSCs with electron transport layers consisting an NPs monolayer covered a ZnO overlayer. The distance poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PCBM) active layer was controlled systematically varying overlayer thickness, its...
Solution processed <10 nm CuCrO<sub>2</sub> nanocrystals are demonstrated as an efficient p-type hole transport layer for organic photovoltaic devices.