结晶度
钙钛矿(结构)
退火(玻璃)
碳纤维
材料科学
化学工程
相(物质)
薄膜
纳米技术
矿物学
化学
复合材料
有机化学
复合数
工程类
作者
Dazheng Chen,Wenming Chai,Dazheng Chen,Junxiao Ma,He Xi,Jingjing Chang,Yue Hao
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2021-03-26
卷期号:: 1500-1510
被引量:105
标识
DOI:10.1021/acsenergylett.1c00325
摘要
The inferior crystallinity and phase stability of CsPbI2Br films have severely hindered the development of carbon-based, all-inorganic perovskite solar cells (PSCs). Herein, we demonstrate the preparation of CsPbI2Br films by the top-seeded solution growth (TSSG) technique. It is performed through spin-coating of CH3NH3Br (MABr) atop CsPbI2Br precursor film prior to annealing, during which perovskite seeds are generated atop it. These perovskite seeds not only serve as nuclei to regulate the growth of CsPbI2Br grains but also provide additional Br– anions to generate a thin Br-rich layer atop the final CsPbI2Br film. The former contributes to the formation of CsPbI2Br film with full coverage, larger grains, higher crystallinity, and fewer electronic defects, while the latter gives rise to residual compressive strain along the film and thus markedly boosts its phase stability. Consequently, the optimized carbon-based, all-inorganic PSC exhibits a much better efficiency of 14.84% coupled with favored storage and operational stability.
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