Effects of the Addition of Tin Powder to Perovskite Precursor Solutions on Band Bending at PEDOT:PSS/Perovskite Interfaces in Mixed-Cation Mixed-Halide Tin Perovskite Solar Cells

被引：5

作者：

Wang, Yihuang ^{[1
]}

Yamaguchi, Seira ^{[1
,4
]}

Motohashi, Mayu ^{[1
]}

Kimata, Haru ^{[1
]}

Xue, Dong ^{[1
]}

Zou, Xiangtao ^{[1
]}

Saeki, Akinori ^{[2
]}

Nakamura, Tomoya ^{[3
]}

Wakamiya, Atsushi ^{[3
]}

Marumoto, Kazuhiro ^{[1
,4
,5
]}

机构：

[1] Univ Tsukuba, Inst Pure & Appl Sci, Dept Mat Sci, Tsukuba, Ibaraki 3058573, Japan

[2] Osaka Univ, Dept Appl Chem, Suita, Osaka 5650871, Japan

[3] Kyoto Univ, Inst Chem Res, Uji, Kyoto 6110011, Japan

[4] Univ Tsukuba, Inst Quantum Sci & Technol IQST, Tsukuba, Ibaraki 3058573, Japan

[5] Univ Tsukuba, Tsukuba Res Ctr Energy Mat Sci TREMS, Tsukuba, Ibaraki 3058571, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2024年 / 15卷 / 24期

基金：

日本科学技术振兴机构;

关键词：

RECOMBINATION; EFFICIENCY;

D O I：

10.1021/acs.jpclett.4c00797

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：

Using electron spin resonance (ESR) spectroscopy, we investigated the effects of the addition of tin (Sn) powder to perovskite layers on band bending at the perovskite surface near poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PE-DOT:PSS) hole-transport layers in perovskite solar cells (PSCs) involving formamidinium (FA)-methylammonium (MA)-mixed-cation I-Br-mixed-halide tin perovskites. We performed dark ESR spectroscopy measurements of a PEDOT:PSS/FA(0.75)MA(0.25)Sn(I0.75Br0.25)(3) stack and of a PEDOT:PSS/Sn-powder-added FA(0.75)MA(0.25)Sn(I0.75Br0.25)(3) stack. The results indicate that FA(0.75)MA(0.25)Sn(I0.75Br0.25)(3) layers have significant downward band bending near PEDOT:PSS layers. Such downward band bending is unfavorable for hole selectivity and surface passivation at the interface. However, the addition of Sn powder to the tin perovskite precursor solution was found to significantly prevent the downward band bending and rather cause upward band bending, which can improve the hole selectivity and field-effect passivation quality. This can be due to prevented oxidation of perovskite layers by Sn powder addition. These findings are crucial for developing highly efficient and stable tin perovskite solar cells.

引用

页码：6392 / 6397

页数：6

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