A5037486096- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Remote Sensing and LiDAR Applications
- Electrochemical sensors and biosensors
- Electronic and Structural Properties of Oxides
- Electrocatalysts for Energy Conversion
- Molecular Junctions and Nanostructures
- Solid-state spectroscopy and crystallography
- Drilling and Well Engineering
- 3D Surveying and Cultural Heritage
- Vitamin K Research Studies
- Nanowire Synthesis and Applications
- Organic Light-Emitting Diodes Research
- Metalloenzymes and iron-sulfur proteins
- CO2 Reduction Techniques and Catalysts
- Optical Imaging and Spectroscopy Techniques
- Photochemistry and Electron Transfer Studies
- Catalytic Processes in Materials Science
- Technostress in Professional Settings
- Advanced Power Generation Technologies
- Catalytic Cross-Coupling Reactions
- Coal and Coke Industries Research
University of Science and Technology of China
2020-2024
Hefei National Center for Physical Sciences at Nanoscale
2020-2024
Tan Kah Kee Innovation Laboratory
2020
National Renewable Energy Laboratory
2019-2020
University of Colorado Boulder
2019-2020
Stanford University
2019
University of Toronto
2013-2018
King Abdullah University of Science and Technology
2013
Beijing Institute of Technology
2011-2012
Beijing Institute of Optoelectronic Technology
2011
Earth-abundant first-row (3d) transition metal-based catalysts have been developed for the oxygen-evolution reaction (OER); however, they operate at overpotentials substantially above thermodynamic requirements. Density functional theory suggested that non-3d high-valency metals such as tungsten can modulate 3d metal oxides, providing near-optimal adsorption energies OER intermediates. We a room-temperature synthesis to produce gelled oxyhydroxides materials with an atomically homogeneous...
Abstract Solution-processed planar perovskite devices are highly desirable in a wide variety of optoelectronic applications; however, they prone to hysteresis and current instabilities. Here we report the first perovskite–PCBM hybrid solid with significantly reduced recombination loss achieved single step. This new material displays an efficient electrically coupled microstructure: PCBM is homogeneously distributed throughout film at grain boundaries. The passivates key PbI 3 − antisite...
Tuning band gaps with three halides Tandem solar cells can boost cell efficiency by using two active layers to absorb the spectrum more completely, provided that are current-matched. Inorganic-organic perovskites tuned appropriate wide gap (∼1.7 electron volts) as top contained iodine and bromine or chlorine have short carrier diffusion lengths undergo photo-induced phase segregation. Xu et al. now report a method for incorporating chloride allows fabrication of stable triple-halide 1.67...
Photovoltaic devices based on lead iodide perovskite films have seen rapid advancements, recently achieving an impressive 17.9% certified solar power conversion efficiency. Reports consistently emphasized that the specific choice of growth conditions and chemical precursors is central to superior performance from these materials; yet roles mechanisms underlying selection materials processing route poorly understood. Here we show grown under iodine-rich are prone a high density deep...
Inserting an ultrathin low-conductivity interlayer between the absorber and transport layer has emerged as important strategy for reducing surface recombination in best perovskite solar cells. However, a challenge with this approach is trade-off open-circuit voltage (Voc) fill factor (FF). Here, we overcame by introducing thick (about 100 nanometers) insulator random nanoscale openings. We performed drift-diffusion simulations cells porous contact (PIC) realized it using solution process...
Organometal halide perovskites have recently attracted tremendous attention both at the experimental and theoretical levels. These materials, in particular methylammonium triiodide, are still limited by poor chemical structural stability under ambient conditions. Today this represents one of major challenges for polycrystalline perovskite-based photovoltaic technology. In addition to this, performance devices is degraded deep localized states, or traps. To achieve better-performing devices,...
A solution-based passivation scheme is developed featuring the use of molecular iodine and PbS colloidal quantum dots (CQDs). The improved translates into a longer carrier diffusion length in solid film. This allows thicker solar-cell devices to be built while preserving efficient charge collection, leading certified power conversion efficiency 9.9%, which new record CQD solar cells.
Colloidal quantum dot (CQD) solar cells are solution-processed photovoltaics with broad spectral absorption tunability. Major advances in their efficiency have been made via improved CQD surface passivation and device architectures enhanced charge carrier collection. Herein, we demonstrate a new strategy to improve further the of CQDs starting from solution phase. A cosolvent system is employed tune solvent polarity order achieve solvation methylammonium iodide (MAI) dispersion hydrophobic...
Organometallic halide perovskites are a class of solution-processed semiconductors exhibiting remarkable optoelectronic properties. They have seen rapid strides toward enabling efficient third-generation solar cell technologies. Here, we report the first material-tailoring TiO2/perovskite/spiro-OMeTAD junction-based photodiodes applications in photodetection, field need fast, sensitive, low-cost, spectrally tunable materials that offer facile integration across broad range substrates. We...
A new method to deposit perovskite thin films that benefit from the thickness control and conformality of atomic layer deposition (ALD) is detailed. seed ALD PbS place-exchanged with PbI2 subsequently CH3NH3PbI3 perovskite. These show promising optical properties, gain coefficients 3200 ± 830 cm−1 .
A novel approach to improving all-inorganic colloidal quantum dot (CQD) homojunction solar cells by engineering the doping spatial profile produce a gradient within n-type absorber is presented. The greatly improves carrier collection and enhances voltages attainable device, leading 1 power point conversion efficiency (PCE) improvement over previous inorganic CQD cells.
A crosslinked hole-extracting electrical contact is reported, which simultaneously improves the stability and lowers hysteresis of perovskite solar cells. Polymerizable monomers crosslinking processes are developed to obviate in situ degradation under lying perovskite. The material band-aligned with required free carrier density induced by a high-work-function metal oxide layer atop device, following remote-doping strategy. As service our authors readers, this journal provides supporting...
Abstract Colloidal quantum dot (CQD) solar cells have risen rapidly in performance; however, their low‐cost fabrication under realistic ambient conditions remains elusive. This study uncovers that humid environments curtail the power conversion efficiency (PCE) of by preventing needed oxygen doping hole transporter during fabrication. A simple oxygen‐doping step enabling manufacturing irrespective seasonal humidity variations is devised. Solar with PCE > 10% are printed high at...
Abstract Quantum dot and well architectures are attractive for infrared optoelectronics, have led to the realization of compelling light sensors. However, they require well-defined passivated interfaces rapid charge transport, this has restricted their efficient implementation costly vacuum-epitaxially grown semiconductors. Here we report solution-processed, sensitive field-emission photodetectors. Using quantum-dots-in-perovskite, demonstrate extraction photocarriers via field emission,...
Application of pseudohalogens in colloidal quantum dot (CQD) solar-cell active layers increases the performance by reducing trap densities and implementing thick CQD films. Pseudohalogens are polyatomic analogs halogens, whose chemistry allows them to substitute halogen atoms strong chemical interactions with surfaces. The pseudohalide thiocyanate anion is used achieve a hybrid surface passivation. A fourfold reduced state density than control observed using suite field-effect transistor...
P-type self-doping is known to hamper tin-based perovskites for developing high-performance solar cells by increasing the background current density and carrier recombination processes. In this work, we propose a gradient homojunction structure with germanium doping that generates an internal electric field across perovskite film deplete charge carriers. This reduces dark of over 2 orders magnitude trap order magnitude. The resultant exhibit higher power conversion efficiency 13.3% excellent...
A simple two-step method was used to produce efficient planar organolead halide perovskite solar cells. Films produced using solely iodine containing precursors resulted in poor morphology and failed devices, whereas addition of chlorine the process greatly improved dense, uniform films. This cells with a fullerene-based passivation layer. The hysteresis effect, which devices are otherwise prone, suppressed through use this interface modifier. combined techniques having stable efficiency...
A means to control the net doping of a CQD solid is identified via design bidentate ligand crosslinking material. The strategy does not rely on implementing different atmospheres at steps in device processing, but instead robust implemented single processing ambient. We achieve an order magnitude difference that allows us build graded photovoltaic and maintain high current voltage maximum power-point conditions.
Abstract As crystalline silicon solar cells approach in efficiency their theoretical limit, strategies are being developed to achieve efficient infrared energy harvesting augment using photons from beyond its 1100 nm absorption edge. Herein we report a strategy that uses multi-bandgap lead sulfide colloidal quantum dot (CQD) ensembles maximize short-circuit current and open-circuit voltage simultaneously. We engineer the density of states simultaneously large quasi-Fermi level splitting...