期刊
NANO LETTERS
卷 17, 期 3, 页码 2028-2033出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b00050
关键词
Perovskite solar cells; cesium lead halide; compositional engineering phase stability
类别
资金
- National Research Foundation of Korea (NRF) - Korea government [NRF-2013R1A2A1A09014038, 2015M1A2A2074663, 2014M3A7B4052200]
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT Future Planning (MSIP) of Korea (Global Frontier R&D Program on Center for Multiscale Energy System) [NRF-2012M3A6A7054861]
Thermally unstable nature of hybrid organic inorganic perovskites has been a major obstacle to fabricating the long-term operational device. A cesium lead halide perovskite has been suggested as an alternative light absorber, due to its superb thermal stability. However, the phase instability and poor performance are hindering the further progress. Here, cesium lead halide perovskite solar cells with enhanced performance and stability are demonstrated via incorporating potassium cations. Based on Cs0.925K0.075PbI2Br, the planar-architecture device achieves a power conversion efficiency of 10.0%, which is a remarkable record in the field of inorganic perovskite solar cells. In addition, the device shows an extended operational lifetime against air. Our research will stimulate the development of cesium lead halide perovskite materials for next-generation photovoltaics.
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