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We describe a facile method to use soluble chemically derived graphene sheets (GSs), which has a oneatom thickness and a two-dimensional structure, as transparent electrode for the preparation of polymer solar cells. Chemically functionalized GSs were obtained by first covalently attaching fluorine and then exposing the obtained fluorinated graphene sheets to an aliphatic amine at room temperature. Scanning electron microscopy, atomic force microscopy and UV-Vis analyses confirmed the obtaining of transparent graphene sheets with an average thickness of 0.7-0.9 nm. A proof-of-concept application in a polymer solar cell is demonstrated. The functionalized graphene, which is cheap and easily prepared, is expected to be a competitive candidate as hole acceptor material in polymer photovoltaic applications.

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