Optical absorption spectra of Cu2ZnSn(S,Se)4 thin-film solar cells by Fourier transform photocurrent spectroscopy

被引:3
|
作者
Syazwana, Abd Rahman Nur [1 ]
Tanabe, Kousei [1 ]
Yamada, Shigeru [1 ]
Itoh, Takashi [1 ]
Nonomura, Shuichi [1 ]
Sugimoto, Kanta [2 ]
Yamada, Akira [2 ]
机构
[1] Gifu Univ, Dept Elect Elect & Comp Engn, Gifu 5011193, Japan
[2] Tokyo Inst Technol, Sch Engn, Dept Elect & Elect Engn, Meguro Ku, Tokyo 1528852, Japan
基金
日本科学技术振兴机构;
关键词
SILICON;
D O I
10.7567/JJAP.57.08RC16
中图分类号
O59 [应用物理学];
学科分类号
摘要
We demonstrated the potential of Fourier transform photocurrent spectroscopy (FTPS) in investigating the optical absorption and quality of a Cu2ZnSn(S,Se)(4) (CZTSSe) absorber within the cell structure. We fabricated thin-film solar cell structures with a CZTSSe absorber, which was prepared by a nanoparticle coating technique and a postannealing process. The optical absorption spectra of CZTSSe absorbers prepared at different annealing temperatures were measured by FTPS. We successfully evaluated the optical band-gap energy from the spectra. An exponential tail was found in the spectra. Urbach energy increased with increasing annealing temperature. The deterioration of photovoltaic performance with increasing Urbach energy might be due to potential fluctuation rather than to structural randomness. (C) 2018 The Japan Society of Applied Physics
引用
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页数:5
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