Preparation and properties of KCl-doped Cu2O thin film by electrodeposition

► Cu2O thin film were fabricated by electrodeposition KCl as doping agent. ► KCl-doped influence morphology of Cu2O thin film. ► KCl-doped influence resistivity, open-circuit voltage and conduction type. ► Annealing processing influence resistivity and open-circuit voltage. ► The forbidden band width of Cu2O thin film is 1.98 eV.