期刊
JOULE
卷 3, 期 12, 页码 3072-3087出版社
CELL PRESS
DOI: 10.1016/j.joule.2019.08.023
关键词
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资金
- National Natural Science Foundation of China [61935016, 11574248, 51802253]
- Fundamental Research Funds for the Central Universities [xjj2018018, xjj2016031]
- China Postdoctoral Science Foundation [2017M613137, 2018M643649]
- LEAP Center, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences [DE-SC0001059]
The introduction of large-volume amines (LVAs) in Sn-based perovskite films has been shown to lead to promising power conversion efficiency (PCE) in Pb-free perovskite solar cells (PSCs). However, the LVAs adopted so far (e.g., phenylethylammonium [PEA] and butylammonium [BA]) are insulating and could impede charge extraction within the perovskite film. Herein, a conjugated LVA, 3-phenyl-2-propen-1-amine (PPA), is introduced in formamidinium tin iodide (FASnI(3)) perovskite. Our results show that the incorporation of PPA results in enlarged grain sizes, reduced trap density, preferential orientation, efficient charge extraction, and enhanced structural stability of FASnI(3) film. These positive effects help in achieving efficient PSCs with a PCE as high as 9.61% with negligible hysteresis and outstanding stability (remains 92% of its initial PCE value after 1,440 h). Furthermore, the presence of PPA enables a self-healing action of PSCs. Most importantly, we report large-area (1 x 1 cm(2)) Sn-based PSCs achieving PCE of 7.08%.
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