Influence of processing parameters on the preparation of CuInS2 thin film by one-step electrodeposition as the solar cell absorber

► The chalcopyrite CuInS2 thin film can be successfully achieved by one-step electrodeposition. ► The aging condition was verified to be the prerequisite for the growth of chalcopyrite CuInS2 film. ► The deposited rate of copper inclined and that of indium increased with prolonged time. ► Annealing at 400 °C can greatly improve the surface quality of as-deposited films.