1. Controllable perovskite crystallization via platelet-like PbI2 films from water processing for efficient perovskite solar cells.
- Author
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Zhou, Shenghou, Zhang, Wenfeng, Lin, Puan, Tian, Liuwen, Li, Xinyi, Jiang, Yutong, Du, Lin, Zhou, Xiangqing, Wen, Fang, Duan, Gongtao, Yu, Lang, Chen, Tao, Ma, Zhu, and Huang, Yuelong
- Subjects
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PHOTOVOLTAIC power systems , *SOLAR cells , *PEROVSKITE , *CRYSTALLIZATION , *GRAIN size - Abstract
• A simple solvent engineering strategy was employed to control morphology of PbI 2 films effectively by water processing. • Platelet-like PbI 2 films can successfully control the residual amount of PbI 2 in perovskite film. • Platelet-like PbI 2 films can control the morphology of the perovskite film and improve the device efficiency [Display omitted] The performance of organic-inorganic perovskite solar cells depends largely on the quality of perovskite film. Currently, various methods are applied to prepare the perovskite film. Among them, the two-step method is counted as a promising candidate to obtain high-quality perovskite film. In this study, we attain a special platelet-like PbI 2 films by applying pure water to cover wet PbI 2 film and standing for a period of time. The unique morphology contributes to the entry of organic cations solution into the PbI 2 and promoting its reaction with PbI 2 , which reducing the residual amount of PbI 2 in the perovskite film. Compared to the traditional two-step method, water processing method can obtain a high-quality perovskite film with enlarged grain size, improved crystallization, and prolonged carrier lifetime. As a result, the efficiency of the prepared device based on the film has increased from 17.90% without water processing to 20.14% of water processing. Which demonstrates that this solvent engineering for PbI 2 film opens up a possibility to prepare high-quality perovskite in a two-step method and obtain highly efficient perovskite solar cells. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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