Pseudohalide‐Induced Recrystallization Engineering for CH3NH3PbI3 Film and Its Application in Highly Efficient Inverted Planar Heterojunction Perovskite Solar Cells |
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| Authors: | Hua Dong Zhaoxin Wu Jun Xi Xiaobao Xu Lijian Zuo Ting Lei Xingang Zhao Lijun Zhang Xun Hou Alex K.‐Y. Jen |
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| Affiliation: | 1. Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, China;2. Department of Materials Science and Engineering, University of Washington, Seattle, WA, USA;3. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, China;4. Key Laboratory of Automobile Materials of MOE and College of Materials Science and Engineer, Jilin University, Changchun, China;5. Department of Physics & Materials Science, City University of Hong Kong, Kowloon, Hong Kong |
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| Abstract: | High crystallinity and compactness of the active layer is essential for metal‐halide perovskite solar cells. Here, a simple pseudohalide‐induced film retreatment technology is developed as the passivation for preformed perovskite film. It is found that the retreatment process yields a controllable decomposition‐to‐recrystallization evolution of the perovskite film. Corresponding, it remarkably enlarges the grain size of the film in all directions, as well as improving the crystallinity and hindering the trap density. Meanwhile, owing to an intermediate catalytic effect of the pseudohalide compound (NH4SCN), no crystal orientation changing and no impurity introduction in the modified film. By integrating the modified perovskite film into the planar heterojunction solar cells, a champion power conversion efficiency of 19.44% with a stabilized output efficiency of 19.02% under 1 sun illumination is obtained, exhibiting a negligible current density–voltage hysteresis. Moreover, such a facile and low‐temperature film retreatment approach guarantees the application in flexible devices, showing a best power conversion efficiency of 17.04%. |
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| Keywords: | flexible solar cells interfacial engineering perovskite solar cells pseudohalide recrystallization |
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