期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 121, 期 27, 页码 14517-14523出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.7b04684
关键词
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资金
- National 973 Projects (MOST) from the Ministry of Science and Technology, China [2013CB932602]
- National Natural Science Foundation of China [NSFC 51622201, 61571015, 91433102, 11404009]
- The Netherlands Organisation for Scientific Research (NWO) [680-50-1511]
Organometal halide perovskites are mixed electronic-ionic semiconductors. It is imperative to develop a deeper understanding of how ion-migration behavior in perovskites impacts the long-term operational stability of solar cells. In this work, we found that ion penetration from the perovskite layer into the adjacent organic hole-selective layer is a crucial cause of performance degradation in perovskite solar cells. The monovalent cation, namely, methylammonium (MA(+)), is the main ion species that penetrates into the organic hole-selective layer of Spiro-MeOTAD because of the built-in electric field during operation. The incorporation of MA(+) induces deep-level defects in the Spiro-MeOTAD layer and thereby deteriorates the hole-transporting ability of Spiro-MeOTAD, degrading solar cell performance. Our work points to two ways to improve the stability of perovskite solar cells: one is to insert a compact ion-blocking layer between Spiro-MeOTAD and perovskite, and the other is to find a hole-selective layer that is insensitive to extraneous ions (MA(+)).
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