Fig. 1: Basic characterization of the bilayer/graphene heterojunction phototransistor.
From: Light-modulated vertical heterojunction phototransistors with distinct logical photocurrents
a Light-modulation schematic diagram, and device structure diagram. b Raman spectrum recorded for the bilayer/graphene heterojunction phototransistor; the inset presents the pentacene characteristic peaks at 1155 cm−1 and 1178 cm−1. c The top panel shows a surface atomic force microscopy (AFM) image of pentacene, and the bottom panel shows a surface AFM image of C60. d Ids–Vg characteristics of the graphene phototransistor before and after deposition of C60/pentacene (Vds = 200 mV). e Photocurrent characteristics at a source-drain bias voltage of 1 V under different wavelength radiation. f Schematic diagram of the opposite light doping effects to modulate the graphene channel
