Preparation method of composite nano heterojunction thin film material and preparation method of composite heterojunction solar battery

The invention discloses a preparation method of a composite nano heterojunction thin film material and a preparation method of a composite heterojunction solar battery. The preparation method of the composite nano heterojunction thin film material is characterized in that the composite nano heterojunction thin film material comprises a base, an n-type ZnO nanorod array thin film growing on the base in a liquid-phase manner, and a ZnS thin film; gaps between ZnO nanorod arrays are filled with the ZnS thin film by adopting a continuous ionic deposition method; and the gaps are filled with the ZnS thin film, and then Cu2O is deposited on the surfaces of ZnO nanorods or ZnS nanorods by adopting an electrochemical deposition method. According to the invention, the gaps between the ZnO nanorod arrays are filled with ZnS, then Cu2O is deposited on the surfaces of the ZnO nanorods or the ZnS nanorods by adopting the electrochemical deposition method, and a ZnO/ZnS/Cu2O composite heterojunction thin film material is formed. With the adoption of the preparation method, the cost of the obtained composite heterojunction solar battery is low, the preparation is simple, and the composite heterojunction solar battery is good in performance.