▎ 摘　　要

NOVELTY - A graphene photocathode comprises photocathode base material, substrate layer comprising graphene material, cesium iodide film and gold film, in order. USE - Graphene photocathode (claimed). ADVANTAGE - The graphene photocathode has excellent electroconductivity, light transmittance, photoelectric conversion effect, strength, light sensitivity and flatness. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of graphene photocathode, which involves using etching solution.