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Development of Earth-abundant CZTS Thin Film Solar Cells with Sulfurization Technique

  • Hironori Katagiri (a1) (a2), Kazuo Jimbo (a1) and Tsukasa Washio (a1) (a2)

Abstract

Cu2ZnSnS4 (henceforth CZTS) absorber layers are successfully synthesized by a sulfurization technique of physical vapor deposited precursors. In our previous report, we have clarified that the off-stoichiometry composition of Cu-poor and Zn-rich is desirable to achieve high conversion efficiency. By using CZTS compound target that provide such active composition, we could conduct a simple single sputtering method to prepare CZTS absorber. In our laboratory, a two-stage process of precursor preparation followed by sulfurization is a major fabrication method from the start of this study. We think that this method is suitable for a mass production. An optimization of the sulfurization process is a quite important issue because the active composition was already revealed. In this paper, TG/DTA system available in the H2S atmosphere is introduced to optimize the sulfurization condition. As a result, bump-free CZTS films were prepared successfully and the fluctuation of J-V properties in one substrate was drastically suppressed.

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1. Ito, and Nakazawa, T., “Electrical and Optical Properties of Stannite-Type Quaternary Semiconductor Thin Films”, Jpn. J. Appl. Phys., 27, 20942097 (1988).10.1143/JJAP.27.2094
2. Katagiri, H., Sasaguchi, N., Hando, S., Hoshino, S., Ohashi, J. and Yokota, T., “Preparation and Evaluation of Cu2ZnSnS4 Thin Films by Sulfurization of E-B Evaporated Precursors”, Sol. Energy Mater. & Sol. Cells, 49, 407414 (1997).10.1016/S0927-0248(97)00119-0
3. Katagiri, H., Ishigaki, N., Ishida, T. and Saitoh, K., “Characterization of Cu2ZnSnS4 Thin Films Prepared by Vapor Phase Sulfurization”, Jpn. J. Appl. Phys., 40, Part 1, No. 2A, 500504 (2001).10.1143/JJAP.40.500
4. Katagiri, H., Saitoh, K., Washio, T., Shinohara, H., Kurumadani, T. and Miyajima, S., “Development of thin film solar cell based on Cu2ZnSnS4 thin films”, Sol. Energy Mater. & Sol. Cells, 65, 141148 (2001).10.1016/S0927-0248(00)00088-X
5. Katagiri, H., Jimbo, K., Moriya, K. and Tsuchida, K., “SOLAR CELL WITHOUT ENVIRONMENTAL POLLUTION BY USING CZTS THIN FILM”, Proceedings of WCPEC-3, 28742879, Osaka (2003).
6. Katagiri, H., “Cu2ZnSnS4 thin film solar cells”, Thin Solid Films, 480-481, 426432 (2005).10.1016/j.tsf.2004.11.024
7. Jimbo, K., Kimura, R., Kamimura, T., Yamada, S., Maw, W. S., Araki, H., Oishi, K. and Katagiri, H., “Cu2ZnSnS4-type thin film solar cells using abundant materials”, Thin Solid Films, 515, 59975999 (2007).10.1016/j.tsf.2006.12.103
8. Katagiri, H., Jimbo, K., Tahara, M., Araki, H. and Oishi, K., “The Influence of the Composition Ratio on CZTS-Based Thin Film Solar Cells”, Mater. Res. Soc. Symp. Proc., 1165, M04–01 (2009).10.1557/PROC-1165-M04-01
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  • EISSN: 1946-4274
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