Abstract
Solution method is promising in fabricating Cu2ZnSn(S,Se)4 (CZTSSe) thin-film solar cells, which could be economical and large-scale implementation, but highly toxic solvents have generally been involved. In this work, an ethylene glycol-based precursor solution method, which is simple and environmentally friendly, was newly designed for fabricating CZTSSe films. It was found that ethylene glycol was a suitable solvent for preparing CuZnSnS4 (CZTS) precursor film, which would be conducive to further applied in selenization processing at moderate temperatures (450°C, 500°C, 540°C). The effects of the selenization temperature on the microstructure, phase composition and photoelectronic properties of CZTSSe films were also investigated. The results reveal that the quality of CZTSSe films could be effectively promoted by selenization temperature, and the highly-crystallized and void-free CZTSSe films were obtained at 540°C, which may hold the promise for fabricating thin film solar cells.
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