Figure 5: Broadband photoresponse measurements of the graphene photodetector.
From: Broadband high photoresponse from pure monolayer graphene photodetector
(a) Time-dependent photocurrent measurements of Sample C when optically pumped in (a) the visible (VIS) (532 nm), (c) the near-infrared (NIR) (1.47 μm) and (e) the mid-infrared (MIR) (~10 μm) ranges. The GQD photodetector shows high photoresponses: ~1.25 AW−1, 0.2 AW−1 and 0.4 AW−1 in the visible, NIR and MIR ranges, respectively. b, d and f show the power dependence of the photocurrents in the three ranges, respectively, where both axes are in the logarithmic scale. The results also demonstrate that the proposed graphene photodetector also possesses a high photosensitivity property, capable of a nW-level input optical power detection. (g) The time-dependent photocurrent measurement over a 20-periods on–off operation under a NIR light (1.47 μm) illumination, demonstrating the reliability of the photodetector.
