“…For photovoltaic applications the potential material should possess an appropriate band gap (between 1 and 1.6 eV), a high absorption coefficient, and low electrical resistivity. Photovoltaic materials include different binary, ternary, and quaternary compounds [e.g., CdTe, PbS, CuInSe 2 , MoBi 2 Se 5 , Cu(In,Ga)Se 2 , Cu 2 ZnSnS 4 ] with their band gap defined by their composition [1][2][3][4]. Different materials are used as window layer including CdS [5,6], Cd(SSe) [7], and ZnS [8].…”