Abstract
Cu2ZnSn(S,Se)4 (CZTSSe) thin films were successfully prepared by selenization and sulfurization of Cu2ZnSnS4 (CZTS) nanocrystals synthesized by a single-step process with a new oleamide-based solution. The structure and properties of the CZTSSe thin films were characterized. The results indicated that the CZTSSe films had formed a single-phase structure at 450°C, and showed rich Cu, Sn and poor Zn compositions, and the Se element in CZTSSe increased with the increase of the annealing temperature. The films were all p-type, and that annealed at 500°C owned lower resistivity. In the visible light region, the films had strong optical absorption and the observed band gaps are 1.36eV and 1.32eV at 450°C and 500°C, respectively.
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