fig5

Figure 5. Photoresponsive behavior of graphene/ZnO QD photodetector. Transfer curves under (A) 460 and (B) 365 nm illumination (V_DS = 0.2 V). (C) Schematic diagram of charge transfer process between ZnO QDs and graphene. (D) Responsivity spectrum of graphene/ZnO QD photodetector and absorption spectrum of ZnO QDs.