from the conferences organized by TANGER Ltd.
Quantum dots (QDs) are of great interest for creating optoelectronic devices due to their tunable bandgap, high stability and simple solution processability for device fabrication. One of the ways to increase the efficiency of such devices is to combine QDs with different carbon nanostructures. Lead sulfide PbS QDs with a ligand shell of oleic acid (OA), methylammonium iodide (MAI) and PbI2 were employed to study the process of charge transfer process between QDs and sheets of reduced graphene oxide (rGO) and graphene oxide (GO). QDs have been linked to graphene sheets by the (3-mercaptopropyl) trimethoxysilane in colloidal solution. As a result, we observed a change in intensity and kinetics of QDs PL, that allowed to estimate the efficiency of the charge transfer. The transfer efficiency for the QD-rGO system was found to be higher than that of the QD-GO system, ~ 80% vs. 66% respectively. Modification of the QDs surface with MAI and PbI2 allowed to achieve a charge transfer efficiency of up to 83% and 89%, respectively.
Keywords: Colloidal quantum dots, reduced graphene oxide, graphene oxide, PbS© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.