A5056507374- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Solid-state spectroscopy and crystallography
- TiO2 Photocatalysis and Solar Cells
- Advanced Photocatalysis Techniques
- Conducting polymers and applications
- Silicon and Solar Cell Technologies
- Transition Metal Oxide Nanomaterials
- solar cell performance optimization
- Advanced battery technologies research
- Organic Light-Emitting Diodes Research
- Optical properties and cooling technologies in crystalline materials
- Spectroscopy and Quantum Chemical Studies
- Photovoltaic Systems and Sustainability
- Gas Sensing Nanomaterials and Sensors
- X-ray Diffraction in Crystallography
- Electronic and Structural Properties of Oxides
- Advancements in Solid Oxide Fuel Cells
- Thin-Film Transistor Technologies
- Phase-change materials and chalcogenides
- Spinal Cord Injury Research
- Organic Electronics and Photovoltaics
- Risk and Safety Analysis
- Ga2O3 and related materials
Applied Physical Sciences (United States)
2021-2025
University of North Carolina at Chapel Hill
2021-2025
National Renewable Energy Laboratory
2023-2024
University of Miami
2017-2023
American Orchid Society
2017-2019
Beijing Institute of Nanoenergy and Nanosystems
2014-2017
Chinese Academy of Sciences
2014-2017
National Center for Nanoscience and Technology
2016-2017
The synthesis and growth of perovskite films with controlled crystallinity microstructure for highly efficient stable solar cells is a critical issue. In this work, thiourea introduced into the CH 3 NH PbI precursor two‐step sequential ethyl acetate (EA) interfacial processing. This shown first time to grow compact microsized monolithically grained films. X‐ray diffraction patterns infrared spectroscopy are used prove that significantly impacts morphology by forming intermediate phase...
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 Perovskite photovoltaics are gaining increasing common ground to partner with or compete silicon reduce cost of solar energy. However, a cost-effective waste management for toxic lead (Pb), which might determine the fate this technology, has not been developed yet. Here, we report an end-of-life material perovskite modules recycle and valuable transparent conductors protect environment create dramatic economic benefits from recycled materials. Lead is separated decommissioned by...
The formation of voids in perovskite films close to the buried interface has been reported during film deposition. These are thought limits efficiency and stability solar cells (PSCs). Here, we studied formed operation that were optimized solution deposition process avoid voids. New found assemble along grain boundaries at bottom interface, caused by loss residual solvent conversion amorphous phase crystalline phase. Unexpectedly, these did not negatively affect PSCs. Decreasing region...
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...
The power conversion efficiency of CdS/CdSe sensitized solar cells is increased to 6.33% by doping Mn<sup>2+</sup> into the CdSe quantum dot.
Despite the high-efficiency and low-cost prospect for perovskite solar cells, great concerns of lead toxicity instability remain this technology. Here, we report an encapsulation strategy modules based on lead-adsorbing ionogel, which prevents leakage withstand long-term stability tests. The ionogel layers integrated both sides enhance impact resistance. self-healable can prevent water permeation into layer adsorb that might leak. encapsulated devices pass damp heat thermal cycling...
2-aminoethanethiol in perovskite films improves the intrinsic water-resistance, and can retain MAPbI<sub>3</sub>perovskite crystal structure when immersed water for a long time (>10 minutes).
Colloidal engineering by controlling the size of colloidal clusters in perovskite precursor was developed to induce monolayer CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> films.
Stabilizing perovskite solar cells requires consideration of all defective sites in the devices. Substantial efforts have been devoted to interfaces, while stabilization grain boundaries received less attention. Here, we report on a molecule tributyl(methyl)phosphonium iodide (TPI), which can convert into wide bandgap one-dimensional (1D) that is mechanically robust and water insoluble. Mixing TPI with precursor results wrapping grains both surfaces converted several nanometer-thick 1D...
Understanding carrier recombination processes in metal halide perovskites is fundamentally important to further improving the efficiency of perovskite solar cells, yet accurate velocity at grain boundaries (GBs) has not been determined. Here, we report determination velocities GBs (SGB) polycrystalline by mapping transient photoluminescence pattern change induced nonradiative carriers GBs. Charge revealed be even stronger than surfaces unpassivated films, with average SGB reaching 2200 3300...
Abstract This work reports a PbS-quantum-dot-sensitized solar cell (QDSC) with power conversion efficiency (PCE) of 4%. PbS quantum dots (QDs) were grown on mesoporous TiO 2 film using successive ion layer absorption and reaction (SILAR) method. The growth QDs was found to be profoundly affected by the concentration precursor solution. At low concentrations, rate-limiting factor crystal adsorption ions surface became limiting in high optimal solution respect quantity size synthesized 0.06 M....
Lead halide perovskites have been promising candidates in spintronics applications; however, the mechanism of spin relaxation is still unclear. Here, we compare temperature-dependent dynamics four perovskite films (XPbY3) with different compositions (X = CH3NH3, Cs; Y I, Br). The room-temperature net lifetime found to increase as molar mass decreases, indicating dominant role orbital coupling their relaxation. As temperature reduced from room 77 K, relaxations CH3NH3PbI3 and CsPbI3 are...
Quasi two‐dimensional perovskites are promising alternatives to conventional three‐dimensional because of their high stability and easy tunability. However, controlling the phase distribution according device architecture remains a major challenge. Here, manipulation purity vertical proven by ultrafast transient absorption spectroscopy, effect on characteristics reported. By adding ethyl acetate as antisolvent, growth direction perovskite film is flipped. CH 3 NH Cl dimethyl sulfoxide used...
Two-step dipping is one of the popular low temperature solution methods to prepare organic–inorganic halide perovskite (CH3NH3PbI3) films for solar cells. However, pinholes in fabricated by static growth method (SGM) result power conversion efficiency (PCE) resulting In this work, process changed into a dynamic controlled stirring PbI2 substrates CH3NH3I isopropanol solution. The (DGM) produces more nuclei and decreases during nucleation crystals. compact with free are obtained DGM, which...
ZnO has been demonstrated to be a promising candidate fabricate high efficiency perovskite solar cells (PSCs) in terms of its better electron extraction and transport properties. However, the inability synthesis nanoparticles (NPs) with minimal surface defects agglomeration remains great challenge hindering fabrication highly efficient PSCs. In this work, crystalline agglomeration-free NPs controlled size were synthesized through facile solvothermal method. Such applied meso-structured The...