Fabrication and characterization of perovskite solar cells with ZnGa2O4 mixed TiO2 photoelectrode

Abstract

Perovskite solar cells are easily decomposed by ultraviolet rays. In order to limit the function of TiO2 as a photocatalyst, ZnGa2O4 nanoparticles were mixed into a mesoporous TiO2 layer. The bandgap of the mixed layer increased by 0.1 eV and the efficiency of perovskite solar cell increased by 0.5%. However, it acts as a resistive element and lowers the current. Since ZnGa2O4 emits absorbed ultraviolet rays in blue, a thin film is additionally formed on the glass substrate to convert ultraviolet rays into electric current in a perovskite solar cell. When an ultraviolet ray is irradiated, an additional current of 100 mu A cm(-2) can be obtained. (c) 2019 The Japan Society of Applied Physics