Suppressing the Phase Segregation with Potassium for Highly Efficient and Photostable Inverted Wide-Band Gap Halide Perovskite Solar Cells

被引：55

作者：

Liang, Jiwei ^{[1
,2
]}

Chen, Cong ^{[1
]}

Hu, Xuzhi ^{[1
]}

Chen, Zhiliang ^{[1
]}

Zheng, Xiaolu ^{[1
]}

Li, Jing ^{[1
]}

Wang, Haibing ^{[1
]}

Ye, Feihong ^{[1
]}

Xiao, Meng ^{[1
]}

Lu, Zhengyi ^{[1
]}

Xu, Yuhao ^{[1
]}

Zhang, Shunping ^{[1
]}

Yu, Rui ^{[1
]}

Tao, Chen ^{[1
]}

Fang, Guojia ^{[1
,2
]}

机构：

[1] Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Peoples R China

[2] Wuhan Univ, Shenzhen Inst, Wuhan 430072, Peoples R China

来源：

ACS APPLIED MATERIALS & INTERFACES | 2020年 / 12卷 / 43期

基金：

中国国家自然科学基金;

关键词：

inverted perovskite solar cell; wide band gap; phase segregation suppression; potassium passivation; photostability; LIGHT; PERFORMANCE; IMPACT; FORMAMIDINIUM; ABSORBER; LAYERS;

D O I：

10.1021/acsami.0c10310

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Wide-band gap (WBG) mixed-halide perovskites have drawn much attention because of their excellent optoelectronic properties and the potential to be deployed in tandem solar cells. Nevertheless, the bromine incorporation inevitably leads to photoinduced phase segregation in WBG mixed-halide perovskites. Herein, potassium is used to effectively suppress photoinduced phase segregation, which is visualized with confocal photoluminescence microscopy imaging. Strikingly, the potassium passivation not only inhibits the formation of the narrow-band gap subphase but also enhances the crystallinity of the WBG mixed-halide perovskite. In addition, the potassium-passivated WBG perovskite exhibits lower defect density, longer charge carrier lifetime, and better photostability. As a result, the optimized KI (2 mol %)-passivated WBG perovskite solar cells (PSCs) deliver a champion power conversion efficiency of 18.3% with negligible hysteresis. They maintain 98% of their initial efficiency after 400 h under 100 mW.cm(-2) white light illumination in nitrogen.

引用

页码：48458 / 48466

页数：9

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