钝化
富勒烯
钙钛矿(结构)
离子键合
阴极
材料科学
碘化物
化学工程
纳米技术
化学物理
化学
无机化学
离子
物理化学
结晶学
图层(电子)
有机化学
工程类
作者
Sibo Li,Kefeng Fan,Yuying Cui,Shifeng Leng,Yiran Ying,Wenjun Zou,Zhiliang Liu,Chang‐Zhi Li,Kai Yao,Haitao Huang
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2020-05-21
卷期号:5 (6): 2015-2022
被引量:38
标识
DOI:10.1021/acsenergylett.0c00871
摘要
Despite having attractive stability over the volatile methylammonium (MA) cation, double-cation (Cs, FA) perovskite solar cells are largely overlooked because of their inferior performance compared to MA-based devices. Among all the device engineering strategies, surface passivation represents a promising approach to acquire improved performance. However, effective passivation strategies have not yet been developed for attaining efficiencies of MA-free cells close to their theoretical limit. Herein, fullerene passivators with different binding groups are investigated to establish relationships between molecule structure and perovskite surface properties. It is found that surface treatment with bis-fulleropyrrolidium iodide (bFPI) can have strong interaction with charged defects, leading to effective defect passivation and favorable band-bending at the interface. The resulting bFPI-treated device shows significantly reduced defect density as well as accelerated electron extraction from perovskite into the cathode. Consequently, the MA-free device exhibits an efficiency of 21.1% with long-term environmental stability.
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