钝化
钙钛矿(结构)
X射线光电子能谱
材料科学
能量转换效率
表面改性
化学物理
光谱学
化学工程
光电子学
化学
纳米技术
物理化学
图层(电子)
结晶学
物理
工程类
量子力学
作者
Dong Wei,Wen‐Cheng Qiao,Shaobing Xiong,Jianming Yang,Xuelu Wang,Liming Ding,Yefeng Yao,Qinye Bao
标识
DOI:10.1007/s40820-022-00854-0
摘要
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 MAPbI3. 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 19F, 207Pb, and 2H 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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