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(a) Schematic illustration of a graphene monolayer (black) embedded by two (n)-a-Si:H layers (the top layer is the emitter and the bottom layer is the collector). Forward-bias output characteristics of the (b) BC (base-collector) and (c) BE (base-emitter) interfacial diodes. Insets: Forward and backward bias of the (b) BC and (c) BE diodes.
