Use of butylamine modified graphene sheets in polymer solar cells

We describe a facile method to use Soluble chemically derived few-layer graphene sheets (GSs) as part of a 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 in aliphatic amine at room temperature. Scanning electron microscopy, atomic force microscopy and UV-Vis analyses confirmed that transparent graphene sheets with in average thickness of 0.7-0.9 nm had been obtained. Their application in a polymer solar cell is demonstrated. Such functionalized graphene. which is cheap and easily prepared, is expected to be used as hole acceptor material in polymer photovoltaic applications.