Here, is presented the impact of pristine graphene, used as additive in the active layer or as substrate, in Lead Halide Perovskites based Solar Cells and LEDs. A small concentration of graphene nanoplatelets, well above the percolation threshold, either in the PEDOT:PSS hole transport layer or in the MAPbI3 active layer of a SC produces structural changes that improve both the efficiency and the stability of the device. Similarly, adding graphene in MAPbBr3 active layer of LEDs lead to larger grain domain sizes and increased luminance. Finally, for MAPbBr3 thin films grown directly on substrates of graphene/graphene oxide, the concentration of the precursor solution and the nature of the substrate lead to a continuous film, or dispersed particles of nano-to-micrometer sizes. The crystal size and microstrain determines the emission properties, showing hugely enhanced photostabilities compared to MAPbBr3 on glass, capable of enduring light densities up to > 100 kW/cm2 for several minutes. These results open new opportunities for the design of nanoengineered photovoltaic devices based on combined graphene/perovskites with improved stability and performance.
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