Preparation and characterization of Cd(S,Se) films via the selenium-vapor-assisted annealing process

► Cd(S,Se) films were synthesized via the CBD method followed by selenization. ► The Se-ions content in Cd(S,Se) films were controlled with the reaction conditions. ► The band gap of Cd(S,Se) films was tunable via adjusting the selenium-ion contents. ► The electrical properties of CdS films were promoted with the selenization process.