Fig. 7
a A schematic diagram of an organic solar cell (OSC) with the following structure: indium tin oxide (ITO)/graphene oxide (GO)/poly-3-hexylthiophene (P3HT):6,6-phenyl-C61-butyric acid methyl ester (PCBM)/Al, b energy level diagrams, and c J–V characteristics of OSCs with different GO thicknesses under simulated AM 1.5 illumination at 1 sun. Reprinted with permission from Li et al. [76], © 2010, ACS Publication