The binary Sb2Se3 thin film solar cells were fabricated in the substrate configuration of Ag/ITO/ZnO/CdS/Sb2Se3/Mo/Glass. The influence of substrate temperatures on Sb2Se3 thin films and solar cells were investigated systematically. The roll-over behavior in light J-V characteristic disappeared after introducing a selenization process of Mo back contact prior to the deposition of Sb2Se3 absorber layer.