Spectrum-Dependent Spiro-OMeTAD Oxidization Mechanism in Perovskite Solar Cells

被引：189

作者：

Wang, Shen ^{[1
]}

Yuan, Wen ^{[2
]}

Meng, Ying Shirley ^{[1
]}

机构：

[1] Univ Calif San Diego, Dept NanoEngn, 9500 Gilman Dr, La Jolla, CA 92093 USA

[2] Michigan State Univ, Dept Chem, E Lansing, MI 48824 USA

来源：

ACS APPLIED MATERIALS & INTERFACES | 2015年 / 7卷 / 44期

关键词：

charge recombination; perovskite solar cells; solid state; p-doping; spectrum; impedance spectroscopy; ORGANOMETAL HALIDE PEROVSKITES; HOLE-TRANSPORT MATERIALS; ORGANIC SEMICONDUCTORS; CHARGE RECOMBINATION; LITHIUM-SALTS; PERFORMANCE; TIO2; DEPOSITION; CONDUCTOR; IMPACT;

D O I：

10.1021/acsami.5b07703

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We propose a spectrum-dependent mechanism for the oxidation of 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine) -9,9'-spirobifluorene (Spiro-OMeTAD) with bis-(trifluoromethane)sulfonimide lithium salt (LiTFSI), which is commonly used in perovskite solar cells as the hole transport layer. The perovskite layer plays different roles in the Spiro-OMeTAD oxidization for various spectral ranges. The effect of oxidized Spiro-OMeTAD on the solar cell performance was observed and characterized. With the initial long-wavelength illumination (>450 nm), the charge recombination at the TiO2/Spiro-OMeTAD interface was increased due to the higher amount of the oxidized Spiro-OMeTAD. On the other hand, the increased conductivity of the Spiro-OMeTAD layer and enhanced charge transfer at the Au/Spiro-OMeTAD interface facilitated the solar cell performance.

引用

页码：24791 / 24798

页数：8

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