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Characterization of Cadmium Doped Zinc in Copper-Zinc-Tin-Sulphide Cu2znsns4 (CZTS) Absorber Material for Solar Energy Application
Characterization of cadmium doped Zinc in copper-zinc-tin-sulphide (CZTS) absorber material for solar energy application was experimented in this research. Cadmium doped at various percentages was successfully deposited on sodalime glasses by spin coating technique. The samples were obtained by preparing Solution A containing copper acetate monohydrate CU(CH3COO)2.H2O, Tin (ii) chloride SnCl2 and Thiourea CH4N2S all dissolved in 5ml methoxyethanol and solution B contained cadmium acetate Cd(CH3COO)2, Zinc acetate ZnC4H6O4 in 5ml methoxyethanol C3H8O2 both are then mixed, this was repeated at various concentrations of Zinc acetate and cadmium acetate to get different ratio composition. The electrical measurement showed a p-type conductivity, resistivity ranges between (0.054-0.193) , carrier or bulk concentration range between (1.775×1017--1.864×1019)/cm3 and mobility with the range of (2.473-551) cm2/vs at room temperature. The CZTS films prepared showed optical absorption coefficient between (2.87--299.932) m-1 and an optical band gap between (1.35-1.76) eV, peak absorbance of 0.907 at visible region and peak optical conductivity of 0.895E+10 were obtained. The Copper-Zinc-Cadmium-Tin-Sulphide CZCTS films created has thickness range between (1-87) nm, and a calculated power conversion efficiency of (0.48-8.48) % and showed best properties for low and moderate cadmium composition and was considered excellent for solar energy application.
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