Abstract
Colloidal quantum dots and graphene oxide composite are promising semiconductor nanomaterials for optoelectronic devices due in part to their tunable light absorption and extraordinary carrier transport properties. We investigate the exciton interaction between them during laser irradiation by transient absorption spectroscopy. In the transient measurement, an exciton bleach buildup signal is exhibited before its recovery at the long probe wavelength. It can be attributed that the trapped electron of graphene oxide backward transfers to the conduction band of quantum dots. With the reduction degree of graphene oxide being increased by laser irradiation, backward electron transfer would take place at both longwave and shortwave, resulting in a broader and stronger exciton bleach feature. Subsequently, exciton bleach disappeared at longwave because of hole trapping by graphene oxide. Exciton transfer of quantum dots and graphene oxide composite has been efficiently manipulated by laser irradiation.
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