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As alternatives to the mixed-anion Cu2ZnSn(S,Se)4 (CZTSSe) alloys,the mixed-cation Cu2Zn(Sn,Ge)Se4 (CZTGSe) and Cu2Zn(Sn,Si)Se4 (CZTSiSe) alloys can also span a band gap range that fits the requirement of the solar cell light absorber.