Figure 9.

(a) Schematic illustration of the graphene–perovskite hybrid phototransistor. The inset shows the top-view optical microscopy image of the device; (b) Band diagrams of graphene and perovskite obtained from ultraviolet photoelectron spectroscopy spectra. The schematic diagram of the band bending at graphene/perovskite interfaces is illustrated below; (c) Responsivity and (d) detectivity of the hybrid phototransistor as functions of light intensity at three selected drain voltages. Reproduced with permission for Figure 9a–d from 2017 Scientific Reports [77].