Graphene solar cell and preparation method thereof

The invention discloses a graphene solar cell and a preparation method thereof, belongs to the technical field of new energy sources, and relates to a solar cell and a preparation method thereof. A graphene thin film is formed on a semiconductor thin film material to obtain a heterojunction between the graphene thin film and the semiconductor thin film; and a metal electrode is lead out so as to form the graphene solar cell. The short-circuit current of the solar cell reaches 5mA/cm , the open-circuit voltage reaches 0.2V, and the efficiency reaches 5 percent. The solar cell has the characteristics of simple structure, large area, low cost and high efficiency; the preparation method of the solar cell is simple, low in manufacturing cost and has a potential application value in the technical field of the new energy sources. Particularly, the flexible solar cell can be obtained; and the solar cell is expected to have a higher application value compared with the conventional silicon solar cell.