1. Stabilizing black-phase formamidinium perovskite formation at room temperature and high humidity.
- Author
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Hui, Wei, Chao, Lingfeng, Lu, Hui, Xia, Fei, Wei, Qi, Su, Zhenhuang, Niu, Tingting, Tao, Lei, Du, Bin, Li, Deli, Wang, Yue, Dong, He, Zuo, Shouwei, Li, Bixin, Shi, Wei, Ran, Xueqin, Li, Ping, Zhang, Hui, Wu, Zhongbin, and Ran, Chenxin
- Subjects
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PEROVSKITE , *OXIDE minerals , *IONIC liquids , *METHYLAMINES , *AMINES - Abstract
The stabilization of black-phase formamidinium lead iodide (a-FAPbI3) perovskite under various environmental conditions is considered necessary for solar cells. However, challenges remain regarding the temperature sensitivity of a-FAPbI3 and the requirements for strict humidity control in its processing. Here we report the synthesis of stable a-FAPbI3, regardless of humidity and temperature, based on a vertically aligned lead iodide thin film grown from an ionic liquid, methylamine formate. The vertically grown structure has numerous nanometer-scale ion channels that facilitate the permeation of formamidinium iodide into the lead iodide thin films for fast and robust transformation to a-FAPbI3. A solar cell with a power-conversion efficiency of 24.1% was achieved. The unencapsulated cells retain 80 and 90% of their initial efficiencies for 500 hours at 85°C and continuous light stress, respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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