钝化
钙钛矿(结构)
重组
材料科学
曲面(拓扑)
表面改性
光电子学
化学
纳米技术
物理化学
图层(电子)
结晶学
基因
数学
几何学
生物化学
作者
Dong Wei,Wen‐Cheng Qiao,Shaobing Xiong,Jianming Yang,Xuelu Wang,Liming Ding,Ye‐Feng Yao,Qinye Bao
出处
期刊:Nano-micro Letters
[Springer Science+Business Media]
日期:2022-04-19
卷期号:14 (1)
被引量:51
标识
DOI:10.1007/s40820-022-00854-0
摘要
Abstract Surface passivation via post-treatment is an important strategy for improving power conversion efficiency and operational stability of perovskite solar cells. However, so far the interaction mechanisms between passivating additive and perovskite are not well understood. Here, we report the atomic-scale interaction of surface passivating additive 2,2-difluoroethylammonium bromine (2FEABr) on the MAPbI 3 . It is found that the bulky 2FEA + cations tend to distribute at film surface, while the Br − anions diffuse from surface into bulk. A combination of 19 F, 207 Pb, and 2 H solid-state NMR further reveal the Br − anions’ partial substitution for the I − sites, the restricted motion of partial MA + cations, and the firmed perovskite lattices, which would improve charge transport and stability of the perovskite films. Optical spectroscopy and ultraviolet photoelectron spectroscopy demonstrate that the 2FEABr induced surface passivation and energetic modification suppress the nonradiative recombination loss. These findings enable the efficiency of the p - i - n structured PSC significantly increasing from 19.44 to 21.06%, accompanied by excellent stability. Our work further establishes more knowledge link between passivating additive and PSC performance.
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