2, Brookhaven National Laboratory, Upton, New York, United States
3, Syracuse University, Syracuse, New York, United States
Metal halide perovskite, a new type of optoelectronic material, has received extraordinary attention in photovoltaics, light-emitting diodes and photodetector applications. In this study, we combined all inorganic cesium lead iodide (CsPbI3) perovskite nanoparticles (PNPs) and perovskite nanowires (PNWs) with single layer graphene (SLG) to obtain 0D–2D PNP–SLG and 1D–2D PNW–SLG hybrids with improved light harvesting. Time-resolved single nanostructure photoluminescence studies of PNPs, PNWs and related hybrids revealed (i) quasi two-state photoluminescence blinking in PNPs, (ii) highly polarized photoluminescence emitted by PNWs and (iii) efficient interfacial electron transfer between perovskite nanostructures and SLG in both PNP–SLG and PNW–SLG hybrids. Doping of poorly absorbing, highly conductive single layer graphene with perovskite nanocrystals and nanowires provides a simple, yet efficient path to obtain hybrids with increased light harvesting properties for potential utilization in the next generation photodetectors and photovoltaic devices.