Photostability and photoinduced processes in CuInS$_{2}$/ZnS quantum dots and their hybrid structures with multilayer graphene nanoribbons

The photostability of the luminescent properties of CuInS$_{2}$/ZnS quantum dots (CIS/ZnS QDs) as a monolayer on a dielectric substrate and as part of a hybrid structure with multilayer graphene nanoribbons (ML GNRs) has been studied. Analysis of the luminescence kinetics of quantum dots has revealed the presence of three main components of luminescence attenuation, characterized by times of the order of 20, 100, and 300 ns. It has been shown that the efficiency of the interaction between CIS/ZnS quantum dots and multilayer graphene nanoribbons has a dependence on the number of graphene monolayers similar to that of CdSe quantum dots. The photostability of CIS/ZnS QDs on a dielectric substrate and in structures with multilayer graphene nanoribbons has been estimated, which allowed us to estimate the energy/charge transfer rates from QDs to multilayer graphene nanoribbons as 10$^{6}$–10$^{7}$ s$^{-1}$.