Composition control of Cu2ZnSnSe4-based solar cells grown by coevaporation

THIN SOLID FILMS

卷:551

Article

Tampo, Hitoshi¹  Makita, Kikuo¹  Komaki, Hironori¹  Yamada, Akimasa¹  Furue, Shigenori¹  Ishizuka, Shogo¹  Shibata, Hajime¹  Matsubara, Koji¹  Niki, Shigeru¹ 

[1] Natl Inst Adv Ind Sci & Technol, Res Ctr Photovolta Technol, Tsukuba, Ibaraki 3058568, Japan

关键词: CZTSe;    Composition ratio;    Na concentration;    Tie line;    Coevaporation;   

DOI  :  10.1016/j.tsf.2013.11.078

来源: Elsevier

【 摘 要 】

The relationship between the composition and conversion efficiency of Cu2ZnSnSe4 (CZTSe)-based solar cells was investigated. CZTSe films were grown by thermal deposition using a coevaporation method. It was found that the composition of CZTSe and Na concentration [Na] have strong correlations to the conversion efficiency, and higher-efficiency samples were obtained with the composition ratios closer to Zn/Sn similar to 1.6, Cu/(Zn + Sn) similar to 0.8, and [Na] similar to 2%. The highest conversion efficiency (eta = 2.1%) was obtained in the composition region, and the composition was significantly nonstoichiometric. The CZTSe composition was automatically fixed on a tie line between Cu2ZnSnSe4 and ZnSe, and it was demonstrated that this composition can be expressed by one parameter. The structural and electrical properties of the high-and low-efficiency samples were also investigated. No significant differences in such properties were observed between the high- and low-efficiency samples by surface, x-ray diffraction, and Raman measurements. However, the low-efficiency sample showed a high carrier concentration. (C) 2013 Published by Elsevier B.V.

【 授权许可】

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