Figure 2
From: Graphene-Insulator-Semiconductor Junction for Hybrid Photodetection Modalities
Device response under dark and illuminated conditions as a function of gate voltage. (a) Id(Vbg) of a typical D2GOS detector under different illumination using a 635 nm laser (red arrow indicates increasing illumination). The vertical line in (a) divides the plot into the accumulation (Acc) and depletion (Dep) regions. For these data, the voltage step time (instrument integration time), which is used to deduce the amount of time the potential well has been collecting photogenerated charge for a particular Vbg value, was estimated to be ~ 20–25 ms (see SI). (b) Id response as a function of time and optical power. A bias of 3 V is applied at a time of 100 ms and turn off at 400 ms. Responsivity as a function of integration time when Vbg is (c) swept and (d) held constant (pulsed).
