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(a) Scanning electron microscopy image of the ZnO QDs on graphene/PET sheets. The inset presents an enlarged image of the ZnO QDs. (b) Cross-sectional bright-field high-resolution transmission electron microscopy image of ZnO QDs on graphene sheets. The inset presents an enlarged HRTEM image of ZnO QDs on graphene/PET sheets.
(a) Currents as functions of the applied voltage (I-V) for the UV photodetector in the dark (rectangles) and under illumination by a 365-nm UV light at a power of 6 W (circles). (b) Plot of log currents of Fig. 2(a) as functions of the voltage for the UV photodetector. (c) Reversible switching between the low- and high-resistivity states for the photodetector under an applied voltage of 3 V with and without UV illumination at different times.
Schematic diagram of the photoresponse mechanisms of the photodetector.
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