Fabrication of Cu2ZnSn(S,Se)4 Solar Cells via an Ethanol-Based Sol–Gel Route Using SnS2 as Sn Source

Zhao, Wangen; Wang, Gang; Tian, Qingwen; Yang, Yanchun; Tianhang,; Pan, Daocheng

Fabrication of Cu2ZnSn(S,Se)4 Solar Cells via an Ethanol-Based Sol–Gel Route Using SnS2 as Sn Source

2014

Cu₂ZnSn(S,Se)₄ semiconductor is a promising absorber layer material in thin film solar cells due to its own virtues. In this work, high quality Cu₂ZnSn(S,Se)₄ thin films have been successfully fabricated by an ethanol-based sol–gel approach. Different from those conventional sol–gel approaches, SnS₂ was used as the tin source to replace the most commonly used SnCl₂ in order to avoid the possible chlorine contamination. In addition, sodium was found to improve the short-circuit current and fill factor rather than the open-circuit voltage due to the decrease of the thickness of small-grained layer. The selenized Cu₂ZnSn(S,Se)₄ thin films showed large densely packed grains and smooth surface morphology, and a power conversion efficiency of 6.52% has been realized for Cu₂ZnSn(S,Se)₄ thin film solar cell without antireflective coating.

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