Schematics for some photovoltaic graphene devices. (a) Schematic and energy diagram of a bulk heterojunction cell that uses graphene as a transparent anode. Adapted from [149]. (b) Construction of an rGO-wrapped PDI hybrid wire, showing the interaction between graphene and PDI. Adapted from [150]. (c) Layered graphene/CdS, using graphene as the electron acceptor. By stacking several bilayers, the and of the device are substantially improved, adapted from [151].
