The graphene is an allotrope of carbon, a 2D thin film material with unique optical, electrical and mechanical properties. Recently, the optoelectronic devices using the graphene are extensively investigated. This paper reviews the applications of the graphene in solar cells, organic light-emitting diodes, and field emission devices. The graphene can serve as the flexible electrode for solar cells and organic light-emitting diodes due to its excellent conductivity and mechanical properties. The graphene can be used as an electron acceptor for organic solar cells for the honeycomb graphene can form a large donor acceptor interface with the organic polymer material, which might improve the exciton's diffusion rate and the electron's mobility. The graphene has a high charge mobility and sharp edges, and is endowed with the great field enhancement factor and can be used as electron conductive and electron emission materials.

graphene  /  solar cells  /  organic light-emitting diode  /  field emission device