期刊
NATURE PHOTONICS
卷 14, 期 3, 页码 154-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41566-019-0572-6
关键词
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资金
- National Basic Research Program of China
- Fundamental Studies of Perovskite Solar Cells [2015CB932200]
- Natural Science Foundation of China [51602149, 61705102, 61722403, 11674121]
- National Key Research and Development Program of China [2017YFA0403403, 2016YFB0201204]
- Natural Science Foundation of Jiangsu Province, China [BK20161011, BK20161010, BK20150064]
- Young 1000 Talents Global Recruitment Program of China
- Jiangsu Specially Appointed Professor Program
- 'Six talent peaks' Project in Jiangsu Province, China
- Program for JLU Science and Technology Innovative Research Team
Two-dimensional perovskite solar cells have been engineered to be robust against moisture, high temperatures and light stress. Two-dimensional Ruddlesden-Popper phase (2DRP) perovskites are known to exhibit improved photostability and environmental stability compared with their three-dimensional (3D) counterparts. However, fundamental questions remain over the interaction between the bulky alkylammoniums and the 2DRP perovskite framework. Here, we unambiguously demonstrate that a sulfur-sulfur interaction is present for a new bulky alkylammonium, 2-(methylthio)ethylamine hydrochloride (MTEACl). In addition to a weaker van der Waals interaction, the interaction between sulfur atoms in two MTEA molecules enables a (MTEA)(2)(MA)(4)Pb5I16 (n = 5) perovskite framework with enhanced charge transport and stabilization. The result is 2DRP perovskite solar cells with significantly improved efficiency and stability. Cells with a power conversion efficiency as high as 18.06% (17.8% certified) are achieved, along with moisture tolerance for up to 1,512 h (under 70% humidity conditions), thermal stability for 375 h (at 85 degrees C) and stability under continuous light stress (85% of the initial efficiency retained over 1,000 h of operation at the maximum power point).
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