Issue 44, 2019

Effect of solid-H2S gas reactions on CZTSSe thin film growth and photovoltaic properties of a 12.62% efficiency device

Abstract

We fabricated CZTSSe thin films using optimized SLG-Mo/Zn/Cu/Sn (MZCT) as a stacked structure and described the phenomenon of Zn elemental volatilization using the MZCT stacked structure. We introduced H2S gas to effectively control the S/(S + Se) ratio of the film in the sulfo-selenization process and to suppress Zn volatilization. Unlike during the selenization process, a stable ZnSSe thin film was formed on the precursor surface during the sulfo-selenization process. The formation of the ZnSSe thin film inhibited Zn volatilization, which facilitated control of the thin film stoichiometry and played an important role in crystal growth. In addition, the sulfo-selenization process using H2S forms a grading of the S/(S + Se) ratio in the depth direction in the ZnSSe layer. The ZnSSe layer with this property causes the band gap grading in the CZTSSe absorption layer. Finally, through our optimized annealing process, we realized a world record CZTSSe solar cell with a certified power conversion efficiency of 12.62% and a centimetre-scale (1.1761 cm2) efficiency of 11.28%.

Graphical abstract: Effect of solid-H2S gas reactions on CZTSSe thin film growth and photovoltaic properties of a 12.62% efficiency device

Supplementary files

Article information

Article type
Paper
Submitted
31 Jul 2019
Accepted
06 Sep 2019
First published
20 Sep 2019
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. A, 2019,7, 25279-25289

Effect of solid-H2S gas reactions on CZTSSe thin film growth and photovoltaic properties of a 12.62% efficiency device

D. Son, S. Kim, S. Kim, Y. Kim, J. Sim, S. Park, D. Jeon, D. Hwang, S. Sung, J. Kang, K. Yang and D. Kim, J. Mater. Chem. A, 2019, 7, 25279 DOI: 10.1039/C9TA08310C

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