Figure 6: Illustration and performance of a solar cell based on graphene electrodes. (a) Illustration of the dye-sensitized solar cell using graphene film as electrode; the four layers from bottom to top are Au, dye-sensitized heterojunction, compact TiO2, and graphene film. (b) The energy level diagram of the graphene/TiO2/dye/spiro-OMeTAD/Au device. (c) I-V curve of the graphene-based cell (black) and the FTO-based cell (red), illuminated under AM solar light (1 sun) [142].