Growth and characterization of Cu_2ZnSn(S_xSe_(1-x))_4 alloys grown by the melting method

摘要

Ⅰ_2-Ⅱ-Ⅳ-Ⅵ_4 quaternary Cu_2ZnSn(S_xSe_(1_x))_4 (CZTSSe) alloys were successfully grown by the melting growth method. The powder X-ray diffraction (XRD) pattern of the CZTSSe alloys showed preferred orientations of (112), (220) and (312) planes, confirming the Kesterite structure. In Raman spectra, the Ai mode peaks expected for CZTS and CZTSe were observed in all samples, and no secondary phases were observed. The CZTSSe alloys in this study were slightly Cu-poor, Zn-rich and Vl-rich, similar to compositions of polycrystalline thin-film materials that have achieved high photovoltaic conversion efficiencies. Single phase and homogeneous CZTSSe alloys were obtained.