Charge Transfer: Oxygen‐Assisted Charge Transfer Between ZnO Quantum Dots and Graphene (Small 18/2013)

An efficient charge transfer between ZnO quantum dots (QDs) and graphene by decorating ZnO QDs on top of graphene is reported on page 3031 by S. Du and co-workers. The photon-generated electronhole pairs inside ZnO QDs split, with the holes discharging the oxygen ions absorbed on the surface of QDs. The unpaired electron are transferred to graphene and recirculate between the source and drain electrodes. The electrical response of the device to UV light is largely enhanced, and photoconductive gains up to 107 can be obtained.