Flexible photovoltaic cells based on two-dimensional materials and their hybrids

The electrodes used for flexible photovoltaic cells require materials that are transparent, conductive and flexible. All these features seem to be met by graphene, on the basis of which we were able to construct the anode. Here we show that increase of the graphene work function is possible using an additional layer of molybdenum or rhenium oxides. Moreover, we show that a single crystalline layer of MoO3-x can increase the work function of the graphene. In consequence there is a real chance for practical applications of graphene in electronics.