A5026945124- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Solid-state spectroscopy and crystallography
- Organic Electronics and Photovoltaics
- Organic Light-Emitting Diodes Research
- Force Microscopy Techniques and Applications
- 2D Materials and Applications
- Thin-Film Transistor Technologies
- Electronic and Structural Properties of Oxides
- Advanced Photocatalysis Techniques
- Near-Field Optical Microscopy
- Advanced Materials Characterization Techniques
- Mechanical and Optical Resonators
National University Cancer Institute, Singapore
2025
National University of Singapore
2025
Applied Physical Sciences (United States)
2023-2024
University of North Carolina at Chapel Hill
2023-2024
Peking University
2018-2023
Beijing Institute of Technology
2021
University of Hong Kong
2019-2020
State Key Laboratory of Rare Earth Materials Chemistry and Application
2019-2020
Battery Park
2020
Beijing National Laboratory for Molecular Sciences
2019-2020
A redox road to recovery Device longevity is a key issue for organic-inorganic perovskite solar cells. Encapsulation can limit degradation arising from reactions with oxygen and water, but light, electric-field, thermal stresses lead metastable elemental halide atom defects. Wang et al. show that the lead-iodine system, introduction of rare earth europium ion pair Eu 3+ -Eu 2+ shuttle electrons recover iodine ions (Pb I − ). Devices incorporating this maintained more than 90% their initial...
The mixed halide perovskites have emerged as outstanding light absorbers for efficient solar cells. Unfortunately, it reveals inhomogeneity in these polycrystalline films due to composition separation, which leads local lattice mismatches and emergent residual strains consequently. Thus far, the understanding of their effects on photovoltaic device performance is absent. Herein we study evolution strain over by depth-dependent grazing incident X-ray diffraction measurements. We identify...
Evening out the heat The conversion of precursors into active layer perovskite solar cells normally occurs by heating underlying substrate. Conversion tends to occur near top film, where solvent is lost, and unwanted preheating reactants substrate before reaction. Li et al . show that use a surrounding transfer oil (anisole) leads more rapid even heating, removes solvent, avoids air water contamination effects. larger grains uniform films led much greater retention efficiency in moving from...
Abstract Further minimizing the defect state density in semiconducting absorber is vital to boost power conversion efficiency of solar cells approaching Shockley-Queisser limit. However, it lacks a general strategy control precursor chemistry for defects reduction family iodine based perovskite. Here alkaline environment solution carefully investigated as an effective parameter suppress incident and affects crystallization kinetics during film fabrication, via rationale adjustment alkalinity...
The defective bottom interfaces of perovskites and hole-transport layers (HTLs) limit the performance p-i-n structure perovskite solar cells. We report that addition lead chelation molecules into HTLs can strongly interact with lead(II) ion (Pb 2+ ), resulting in a reduced amorphous region near passivated surface. minimodule an aperture area 26.9 square centimeters has power conversion efficiency (PCE) 21.8% (stabilized at 21.1%) is certified by National Renewable Energy Laboratory (NREL),...
Abstract Enhancing device lifetime is one of the essential challenges in perovskite solar cells. The ultrathin Eu‐MOF layer introduced at interface between electron‐transport and absorber to improve stability. Both Eu ions organic ligands MOF can reduce defect concentration carrier transport. Moreover, due Förster resonance energy transfer effect, films light utilization decomposition under ultraviolet light. Meanwhile, also turns tensile strain compressive films. As a result, corresponding...
Abstract Quasi‐2D (Q‐2D) perovskites are promising materials applied in light‐emitting diodes (LEDs) due to their high exciton binding energy and quantum confinement effects. However, Q‐2D feature a multiphase structure with abundant grain boundaries interfaces, leading nonradiative loss during the energy‐transfer process. Here, more efficient transfer is achieved by manipulating crystallization kinetics of different‐ n phases. A series alkali‐metal bromides utilized manipulate nucleation...
In inverted perovskite solar cells (PSCs), the fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) is a widely used electron transport material. However, high degree of energy disorder and inadequate passivation PCBM limit efficiency devices, severe self-aggregation unstable morphology lifespan devices. Here, we design series dyads FP-Cn (n = 4, 8, 12) to replace as an layer, where [60]fullerene linked with terpyridine chelating group via flexible alkyl chain different...
The light-emitting diodes (LEDs) used in indoor testing of perovskite solar cells do not expose them to the levels ultraviolet (UV) radiation that they would receive actual outdoor use. We report degradation mechanisms p-i-n-structured under unfiltered sunlight and with LEDs. Weak chemical bonding between perovskites polymer hole-transporting materials (HTMs) transparent conducting oxides (TCOs) dominate accelerated A-site cation migration, rather than direct HTMs. An aromatic phosphonic...
All-perovskite tandem solar cells (TSCs) hold the promise of surpassing efficiency limits single-junction cells. However, enhancing TSC faces challenge significant open-circuit voltage (VOC) loss...
Crystal orientation has a great impact on the properties of perovskite films and resultant device performance. Up to now, exquisite control crystal (the preferred crystallographic planes stacking mode with respect particular planes) in mixed-cation perovskites received limited success, underlying mechanism that governs performance is still not clear. Here, thermodynamically favored formamidinium/methylammonium (FA/MA) finely tuned by composition engineering. Density functional theory...
Abstract Organic–inorganic hybrid perovskite solar cells (PSCs) have demonstrated high efficiency and improved stability, which shows promising potential for commercialization. However, among all challenges, the material device instability of methylammonium lead iodide (MAPbI 3 ) absorber are regarded as serious obstacles to future development devices long‐term operation. Compared with conventional MAPbI , formamidinium (FAPbI cesium (CsPbI attracted more attention due their superior thermal...
Abstract The tandem cell structure is the most promising solution for next generation photovoltaic technology to overcome single‐junction Shockley–Queisser limit. fabrication of a perovskite/c‐Si monolithic device has not yet been demonstrated on c‐Si bottom produced from an industrial production line. Here, with tunneling oxide passivating contact (TOPCon) line as device, and top featuring solution‐processed perovskite films form are used. features rough damage etched, but untextured front...
The thermal instability of organic–inorganic halide perovskite solar cells (PSCs) is one the most important factors restraining their commercialization.