期刊
SCIENCE
卷 354, 期 6308, 页码 92-95出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aag2700
关键词
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资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Solar Energy Technologies Office [DE-AC36-08GO28308DOE]
- Department of Science and Technology, government of India
- Indo-U.S. Science and Technology Forum (IUSSTF)
- NASA Space Technology Research Fellowship
- NREL Director's Fellowship
We show nanoscale phase stabilization of CsPbI3 quantum dots (QDs) to low temperatures that can be used as the active component of efficient optoelectronic devices. CsPbI3 is an all-inorganic analog to the hybrid organic cation halide perovskites, but the cubic phase of bulk CsPbI3 (alpha-CsPbI3)-the variant with desirable band gap-is only stable at high temperatures. We describe the formation of alpha-CsPbI3 QD films that are phase-stable for months in ambient air. The films exhibit long-range electronic transport and were used to fabricate colloidal perovskite QD photovoltaic cells with an open-circuit voltage of 1.23 volts and efficiency of 10.77%. These devices also function as light-emitting diodes with low turn-on voltage and tunable emission.
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