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a Schematic and b energy band diagrams of an indium tin oxide (ITO)/poly(3,4ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/poly-3-hexylthiophene (P3HT):graphene quantum dots (GQDs)/Al device. Reprinted with permission from Li et al. [63], © 2011, Wiley
