1. Introduction Copper zinc tin sulfide(Cu2znSnS4, czTs) is a promising absorber material for thin film solar cells due to its has large absorption coefficients(>10^4cm) and ideal direct band gaps(1.4-1.5 eV) Additionally, CzTS also characterized by its abundant availabity in the earth thin crust and its relative low toxicity,which are prerequisites for low-cost photovoltaics, The best CZTS solar cell so far was produced by a vacuum thermal evaporation process with subsequent short atmospheric pressure annealing.