Effect of nickel doping on the photocatalytic activity of ZnO thin films under UV and visible light

► The addition of Ni2+ ions to the initial solution modifies the the ganglia-like hills and wrinkles morphology of the films. ► Amount of nickel doping strongly affect the photocatalytic activity of ZnO films under both, the UV and visible light iradiation. ► The concentration of MG by ZnO films decreases even in darkness.