期刊
SOLAR RRL
卷 6, 期 2, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202100906
关键词
FA(0.83)Cs(0.17)PbI(1.8)Br(1.2); high quality; intermediate engineering; solar cells; wide-bandgap perovskites
资金
- Natural Science Foundation of Jiangsu Province [BK20191385]
- National Natural Science Foundation of China [201502088, 21631006]
- High Level Talent Project of Nanjing Forestry University [GXL2018003]
The introduction of FACl intermediate engineering successfully retards the fast crystallization of Cs(0.17)FA(0.83)PbI(1.8)Br(1.2) wide-bandgap perovskite, leading to the enhancement of photovoltaic performance and prolonging device aging.
Wide-bandgap perovskites based on alloying cesium and formamidinium lead mixed halides (Cs(x)FA(1-x)Pb(IyBr1-y)(3)) have received great attention due to their potential application in high-efficiency tandem solar cells. However, the fast crystallization of Cs(x)FA(1-x)Pb(IyBr1-y)(3) perovskite films results in a high trap density and hinders the further enhancement of the photovoltaic performance. Herein, an intermediate engineering is developed to retard the fast crystallization of Cs(0.17)FA(0.83)PbI(1.8)Br(1.2) wide-bandgap perovskite by adding FACl in the precursor solution. The introduction of the FACl additive leads to the formation of a thermodynamic phase-pure intermediate which facilitates the further crystallization of a high-quality perovskite thin film at elevated temperature and thus enhances the ultimate device performance. The champion device achieves an efficiency over 19% and exhibits 83.8% retention after 50 days aging without encapsulation.
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