Interfacial defect passivation by chenodeoxycholic acid for efficient and stable perovskite solar cells

被引：25

作者：

Zhang, Xinpeng ^{[1
]}

Wu, Jihuai ^{[1
]}

Du, Yitian ^{[1
]}

Li, Ziruo ^{[1
]}

Chen, Qi ^{[1
]}

Zhang, Zeyu ^{[1
]}

Rong, Bin ^{[1
]}

Wang, Deng ^{[1
]}

Li, Guodong ^{[1
]}

Sun, Weihai ^{[1
]}

机构：

[1] Huaqiao Univ, Inst Mat Phys Chem, Engn Res Ctr Environm Friendly Funct Mat, Fujian Engn Res Ctr Green Funct Mat,Minist Educ, Xiamen 361021, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2020年 / 472卷

基金：

中国国家自然科学基金;

关键词：

Perovskite solar cell; Surface defect; Carboxyl group; Passivation; Recombination; HIGH-PERFORMANCE; HALIDE PEROVSKITES; DYE; SOLVENT; HYBRID; DURABILITY; CRYSTALS; GROWTH; LAYERS; ROUTE;

D O I：

10.1016/j.jpowsour.2020.228502

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：

Passivating the surface defects of perovskite has become one of the important strategies to suppress non-radiative recombination and improve the photovoltaic performance and stability of perovskite solar cells (PVSCs). Herein, we introduce chenodeoxycholic acid (CDCA) on the surface of pemvskite layer. The infrared spectra and nuclear magnetic resonance (H-1 NMR) spectra prove the carboxyl (-COOH) group on CDCA combination with the formamidinium (FA(+)) ions on perovskite. The water-contact angle measurement indicates that the long alkyl chain of CDCA covers the surface of perovskite film. The photoelectrical characterization demonstrates that the surface defects of the perovskite layer are passivated and carrier non-radiative combinations are suppressed. Under an optimized CDCA concentration of 0.2 mg.ml(-1), the CDCA passivated PVSC achieves an average power conversion efficiency (PCE) of 20.41%, as compared with the pristine PVSC with an average PCE of 18.18%.

引用

页数：8

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