5-Ammonium Valeric Acid Iodide to Stabilize MAPbI3 via a Mixed-Cation Perovskite with Reduced Dimension

被引：23

作者：

Wei, Ning ^{[1
,2
]}

Chen, Yuetian ^{[2
]}

Miao, Yanfeng ^{[2
]}

Zhang, Taiyang ^{[2
]}

Wang, Xingtao ^{[2
]}

Wei, Hao ^{[1
]}

Zhao, Yixin ^{[2
,3
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Elect Informat & Elect Engn, Dept Micro Nano Elect, Key Lab Thin Film & Microfabricat,Minist Educ, Shanghai 200240, Peoples R China

[2] Shanghai Jiao Tong Univ, Frontiers Sci Ctr Transformat Mol, Sch Environm Sci & Engn, Shanghai 200240, Peoples R China

[3] Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200240, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2020年 / 11卷 / 19期

关键词：

SOLAR-CELLS; PLANAR PEROVSKITE; EFFICIENT; PERFORMANCE; SPACE;

D O I：

10.1021/acs.jpclett.0c02528

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

5-Ammonium valeric acid iodide (AVAI) has been widely known as a stabilizer to enhance the stability of MAPbI(3) perovskite, but its role and function is still under exploration. The typical 2D perovskites of AVA(2)PbI(4) have been proposed as the capping layer for stabilization. Here, a novel AVA-MA mixed-cation perovskite of AVAMAPbI(4) is found to show a more even and compact coverage than the typical 2D perovskite of AVA(2)PbI(4). A simple post-treatment on MAPbI(3) films by using AVAI isopropanol solution can fabricate such a mixed-cation 2D perovskite capping layer on the MAPbI(3) sample. This AVAMAPbI(4) capping layer effectively passivates surface defects of MAPbI(3) perovskite films and reduces the charge-carrier recombination, enabling AVAI-MAPbI(3) perovskite films to exhibit improved stability against thermal and moisture stress. Finally, the AVAI-MAPbI(3)-based perovskite solar cells also show an enhanced photovoltaic performance with a champion PCE up to 20.05% with enhanced stability.

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收藏

页码：8170 / 8176

页数：7

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