Oriented Low-n Ruddlesden-Popper Formamidinium-Based Perovskite for Efficient and Air Stable Solar Cells
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作者
Kong, Weiyu; Zeng, Fang; Su, Zhenhuang; Wang, Tao; Qiao, Liang; Ye, Tianshi; Zhang, Lin; Sun, Ruitian; Barbaud, Julien; Li, Feng; Gao, Xingyu; Zheng, Rongkun; Yang, Xudong
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刊物名称
ADVANCED ENERGY MATERIALS
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年、卷、文献号
2022, 12, 1614-6832
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关键词
Kong, Weiyu; Zeng, Fang; Su, Zhenhuang; Wang, Tao; Qiao, Liang; Ye, Tianshi; Zhang, Lin; Sun, Ruitian; Barbaud, Julien; Li, Feng; Gao, Xingyu; Zheng, Rongkun; Yang, Xudong
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摘要
The relatively lower crystallinity and random orientation of quantum well structures hinder carrier transport and limit the performance of formamidinium (FA) based low-n 2D perovskite devices. In this work, the crystallization and quantum well orientation are fine tuned to achieve efficient low-n FA based Ruddlesden-Popper perovskite solar cells. The effects of different ionic additives on the crystallization, orientation, and photovoltaic performance of FA based low-n 2D perovskites are comparatively investigated. It is found that NH4+ and SCN- can significantly retard the heterogeneous crystallization of low-n phases in the intermediate state, and drive the templated growth of quantum well structure with vertical orientation. The optimized photovoltaic device based on (BA)(2)(FA)(3)Pb4I13 achieved a power conversion efficiency (PCE) of 18.14%, setting the highest record for FA-based low-n 2D perovskite solar cells as far as it is known (average n = 4). The unencapsulated device exhibited excellent stability and maintained 93.3% of its original PCE at 85 degrees C, and 86.3% at 1 Sun illumination after 720 h in humid ambient condition.
