钝化
材料科学
钙钛矿(结构)
能量转换效率
偶极子
光电子学
场效应
磁滞
光伏系统
钙钛矿太阳能电池
纳米技术
化学物理
化学工程
图层(电子)
凝聚态物理
电气工程
物理
工程类
有机化学
化学
作者
Fengyou Wang,Yuhong Zhang,Meifang Yang,Donglai Han,Lili Yang,Lin Fan,Yongming Sui,Yunfei Sun,Xiaoyan Liu,Xiangwei Meng,Jinghai Yang
标识
DOI:10.1002/adfm.202008052
摘要
Abstract Organolead halide hybrid perovskite solar cells (PSCs) have become a shining star in the renewable devices field due to the sharp growth of power conversion efficiency; however, interfacial recombination and carrier‐extraction losses at heterointerfaces between the perovskite active layer and the carrier transport layers remain the two main obstacles to further improve the power conversion efficiency. Here, novel field‐effect passivation has been successfully induced to effectively suppress the interfacial recombination and improve interfacial charge transfer by incorporating interfacial polarization via inserting a high work function interlayer between perovskite and holes transport layer. The charge dynamics within the device and the mechanism of the field‐effect passivation are elucidated in detail. The unique interfacial dipoles reinforce the built‐in field and prevent the photogenerated charges from recombining, resulting in power conversion efficiency up to 21.7% with negligible hysteresis. Furthermore, the hydrophobic interlayer also suppresses the perovskite decomposition by preventing the moisture penetration, thereby improving the humidity stability of the PSCs (>91% of the initial power conversion efficiency (PCE) after 30 d in 65 ± 5% humidity). Finally, several promising research perspectives based on field‐effect passivation are also suggested for further conversion efficiency improvements and photovoltaic applications.
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