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A single atomic layer of graphene, integrated onto an undoped bulk substrate in a back-gated transistor configuration, demonstrates surprising strong photoconduction, and yet, the physical origin of the photoresponse is not fully understood. Here, we use a detailed computational model to demonstrate that the photoconductivity arises from the electrostatic doping of graphene, induced by the surface...
Recent experiments on graphene phototransistors, composed of a graphene channel back-gated by an undoped 6H-SiC (see Fig. 1), have demonstrated impressive photo-responsivity (> 1A/W) [1,3]. Despite several experimental reports and significant potential for commercial application, the theoretical basis of this high sensitivity is not fully understood. Here we use detailed computational modeling...
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