resistance losses. CdTe is also used as an absorber layer with CdS as buffer layer and an efficiency of 18.7% has been reported by First solar [19]. But it has some problem such as toxicity of cadmium, scarcity of tellurium, cost etc. Another suitable material for thin film solar cell is CZTS, first synthesized and analysed in 1967 and has a band gap of ~1.45 eV [20]. CZTS is a quaternary compound semiconductor of (I)2(II)(IV)(VI)4 type with excellent PV effect and theoretical conversion efficiency as high as 32% is possible [21].