甲脒
材料科学
结晶度
钙钛矿(结构)
结晶
光伏系统
能量转换效率
化学工程
量子效率
光电子学
复合材料
电气工程
工程类
作者
Weiyu Kong,Fang Zeng,Zhenhuang Su,Tao Wang,Liang Qiao,Tianshi Ye,Lin Zhang,Ruitian Sun,Julien Barbaud,Feng Li,Xingyu Gao,Rongkun Zheng,Xudong Yang
标识
DOI:10.1002/aenm.202202704
摘要
Abstract 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 NH 4 + 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 Pb 4 I 13 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 °C, and 86.3% at 1 Sun illumination after 720 h in humid ambient condition.
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