期刊
ADVANCED ENERGY MATERIALS
卷 9, 期 7, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201803572
关键词
all-inorganic perovskite solar cells; phase stability; structural reconstruction; thermal stability
类别
资金
- National Natural Science Foundation of China [51872126, 51672111, 51802120, 11675252, 11605278, U1632265]
- Natural Science Foundation of Guangdong Province [2018030310181]
- research project of scientific research cultivation and innovation fund of Jinan University [21617341]
- Science and Technology Program of Guangzhou, China [201607020010]
Although all-inorganic perovskite solar cells (PSCs) demonstrate high thermal stability, cesium-lead halide perovskites with high iodine content suffer from poor stability of the black phase (alpha-phase). In this study, it is demonstrated that incorporating InCl3 into the host perovskite lattice helps to inhibit the formation of yellow phase (delta-phase) perovskite and thereby enhances the long-term ambient stability. The enhanced stability is achieved by a strategy for the structural reconstruction of CsPbI2Br perovskite by means of In3+ and Cl- codoping, which gives rise to a significant improvement in the overall spatial symmetry with a closely packed atom arrangement due to the crystal structure transformation from orthorhombic (Pnma) to cubic (Pm-3m). In addition, a novel thermal radiation heating method that further improves the uniformity of the perovskite thin films is presented. This approach enables the construction of all-inorganic InCl3:CsPbI2Br PSCs with a champion power conversion efficiency of 13.74% for a small-area device (0.09 cm(2)) and 11.4% for a large-area device (1.00 cm(2)).
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