期刊
SCIENCE
卷 364, 期 6439, 页码 475-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aav7911
关键词
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资金
- U.S. Department of Energy (DOE) [DE-AC36-08GO28308]
- Alliance for Sustainable Energy LLC
- Air Force Research Laboratory under Space Vehicles Directorate [FA9453-11-C-0253]
- DOE SunShot Initiative under the Next Generation Photovoltaics 3 program [DE-FOA-0000990]
- DOE Office of Basic Energy Sciences, Office of Science - DOE Office of Energy Efficiency and Renewable Energy, Solar Energy Technologies Office
- Center for Hybrid Organic Inorganic Semiconductors for Energy (CHOISE), an Energy Frontier Research Center - DOE Office of Basic Energy Sciences, Office of Science
- National Center for Photovoltaics - DOE Office of Energy Efficiency and Renewable Energy, Solar Energy Technologies Office
All-perovskite-based polycrystalline thin-film tandem solar cells have the potential to deliver efficiencies of >30%. However, the performance of all-perovskite-based tandem devices has been limited by the lack of high-efficiency, low-band gap tin-lead (Sn-Pb) mixed-perovskite solar cells (PSCs). We found that the addition of guanidinium thiocyanate (GuaSCN) resulted in marked improvements in the structural and optoelectronic properties of Sn-Pb mixed, low-band gap (similar to 1.25 electron volt) perovskite films. The films have defect densities that are lower by a factor of 10, leading to carrier lifetimes of greater than 1 microsecond and diffusion lengths of 2.5 micrometers. These improved properties enable our demonstration of >20% efficient low-band gap PSCs. When combined with wider-band gap PSCs, we achieve 25% efficient four-terminal and 23.1% efficient two-terminal all-perovskite-based polycrystalline thin-film tandem solar cells.
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