Graphene–perovskite hybrids achieve ultrasensitive broadband photodetection

The graphene channel serves as an ultrafast, low-noise pathway for photoinduced carriers, translating small changes in perovskite charge density into large modulations of graphene conductance. This strong photogating effect, together with the mixed-phase “raisin bread” perovskite morphology that confines and stores carriers, yields very high photoconductive gain. Furthermore, the use of chemical-vapor-deposition graphene and maskless inkjet printing allows direct perovskite deposition onto graphene without lithography on top of the 2D layer, preserving graphene quality and supporting integration on large-area and potentially flexible substrates.

Researchers from the University of Barcelona, Jaume I University, Slovak University of Technology and University of Valencia have realized graphene-enhanced hybrid photodetectors by integrating inkjet-printed mixed-phase CsPbBr₃/Cs₄PbBr₆ perovskite films directly onto graphene platforms. In this architecture, a high-mobility 2D graphene channel is intimately coupled to a photoconductive perovskite layer, enabling highly efficient photogating and broadband charge transport across the device.The graphene channel serves as an ultrafast, low-noise pathway for photoinduced carriers, translating small changes in perovskite charge density into large modulations of graphene conductance. This strong photogating effect, together with the mixed-phase “raisin bread” perovskite morphology that confines and stores carriers, yields very high photoconductive gain. Furthermore, the use of chemical-vapor-deposition graphene and maskless inkjet printing allows direct perovskite deposition onto graphene without lithography on top of the 2D layer, preserving graphene quality and supporting integration on large-area and potentially flexible substrates.

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