We have studied the effect of the flow rate on the physical properties of CuInS2 thin films. But as the indium is anexpensiveelement and rare in the earth’s crust, CuInS2 is replaced by Cu2ZnSnS4 (CZTS) which has received considerableattention as one of the promising absorbers for the fabrication of solar cells with conversion efficiency close to 12.6%. Inorder to improve its structural, morphological, electrical and optical properties, we started by preparing CZTS thin film usingan aqueous solution at various substrate temperatures by spray pyrolysis technique. Next Sprayed CZTS thin film preparedunder the optimised conditions is annealed in nitrogen atmosphere at 450, 500 and 550 °C during 60 min. In another hand,we have prepared the CZTS thin films using an ethanolic solution atvarious sulfur concentration then the film deposited atthe optimised condition was annealed under nitrogen atmosphere for an hour at different annealing temperatures. Finally, asultimate test it is useful to finish some solar cells and test them accordingly. In our next researches, we can test our findingsthrough the proposed following solar cell: Ag/CZTS/CdS/ZnO/ZnO:Al. The CZTS thin films will be elaborated under theoptimized experimental spray parameters for both solution types. In our laboratory, cadmium sulfide nanomaterial is grown byChemical bath deposition it is a buffer layer and Zinc oxide material is synthetised by spray pyrolysis it is an optical window insolar cell devices.