Synthesis of cauliflower-like ZnO-TiO2 composite porous film and photoelectrical properties

► The novel cauliflower-like TiO2-ZnO films were successfully fabricated. ► This cauliflower-like morphology of TiO2-ZnO could increase the dye absorption. ► The effects of ZnO doping on the photovoltaics of DSCs were systematically studied. ► With Zn/Ti molar ratio not more than 3%, the Jsc and η of DSC were greatly improved.