期刊
SCIENCE ADVANCES
卷 3, 期 10, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aao4204
关键词
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资金
- Center for Advanced Solar Photophysics
- Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences
- NASA Space Technology Research Fellowship
- DOE/Energy Efficiency and Renewable Energy (EERE) Postdoctoral Research Award under the EERE/Solar Energy Technologies Office (SETO) under DOE [DE-SC00014664]
- hybrid perovskite solar cell program of the National Center for Photovoltaics - DOE
- Office of EERE
- SETO
- NREL [DE-AC36-08G028308]
We developed lead halide perovskite quantum dot (QD) films with tuned surface chemistry based on A-site cation halide salt (AX) treatments. QD perovskites offer colloidal synthesis and processing using industrially friendly solvents, which decouples grain growth from film deposition, and at present produce larger open-circuit voltages (V-OC's) than thin-film perovskites. CsPbI3 QDs, with a tunable bandgap between 1.75 and 2.13 eV, are an ideal top cell candidate for all-perovskite multijunction solar cells because of their demonstrated small V-OC deficit. We show that charge carrier mobility within perovskite QD films is dictated by the chemical conditions at the QD-QD junctions. The AX treatments provide a method for tuning the coupling between perovskite QDs, which is exploited for improved charge transport for fabricating high-quality QD films and devices. The AX treatments presented here double the film mobility, enabling increased photocurrent, and lead to a record certified QD solar cell efficiency of 13.43%.
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