1. Linear pseudo-halogen anion passivating defects for MAPbI3 perovskite solar cells.
- Author
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Li, Jianhua, Zhang, Xilin, Zhang, Zhifang, Liu, Tianxiao, Chen, Lei, and Liu, Zhiyong
- Subjects
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SOLAR cells , *PHOTOVOLTAIC power systems , *COORDINATE covalent bond , *PEROVSKITE , *ANIONS , *SHORT circuits , *PASSIVATION - Abstract
The development of perovskite solar cells has improved rapidly. However, PSCs generally suffer from instability, due to the detrimental defects. Additive engineering is a favorable method for defect passivation. In this work, the linear pseudo-halogen salt, KSCN, is introduced into the MAPbI 3 perovskite film to improve the performance of PSC. The trap density of cells with SCN− is decreased significantly. The SCN− not only can fill halogen vacancies to reduce the halide-related defects, but also can interact with the uncoordinated Pb2+ via coordinate bond to stabilize perovskite lattice structure. Moreover, the performance of devices with other linear pseudo-halogen anions (OCN−, SeCN−) are also investigated. Due to the improved short circuit current density, the power conversion efficiency of devices increases from 18.02% (PVK) to 20.41% (PVK–SCN-), 19.53% (PVK–OCN-) and 19.23% (PVK–SeCN-), respectively. After introducing pseudo-halide anions, the devices showed robust stability under the ambient environment. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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