The invention discloses a cuprous-
oxide-based
heterojunction photocathode and a preparation method thereof. The cuprous-
oxide-based
heterojunction photocathode structurally comprises a gold
electrode layer, a cuprous
oxide layer, an aluminum-doped
zinc oxide layer, a
titanium dioxide layer and a
platinum cocatalyst layer from bottom to top and is packaged with
epoxy resin. The preparation method of the cuprous-oxide-based
heterojunction photocathode comprises the steps that firstly, a cuprous oxide slice is prepared through a
thermal oxidation method, and the cuprous oxide slice serves as a light
absorption layer and also serves as a substrate of the photocathode; a layer of gold
electrode is deposited on one side of the cuprous
oxide substrate, a wire is led out, and the side is packaged with
epoxy resin glue; then, after the other side of the cuprous
oxide substrate is etched, the aluminum-doped
zinc oxide layer and the
titanium dioxide layer are deposited in sequence, and the edges are packaged through the
epoxy resin glue; and finally,
platinum particles are deposited on the surface of
titanium dioxide to serve as cocatalysts. By means of the cuprous-oxide-based heterojunction photocathode and the preparation method of the cuprous-oxide-based heterojunction photocathode, the difficulty in preparing the photocathode with the cuprous
oxide substrate prepared through the
thermal oxidation method is greatly lowered, the preparation process is simple, the light current is high, and wide development prospect is achieved.