A photoelectric device using graphene is disclosed. A single layer graphene channel is formed on the n-type doped semiconductor substrate. One end of the graphene channel is connected to the source electrode and is physically separated from the drain electrode. The light that has passed through the gate insulating layer and the gate electrode issues electron-hole pairs at the interface of the graphene channel and the semiconductor substrate forming the Schottky junction, and forms a photocurrent by the Schottky barrier. Further, the Schottky barrier is changed according to the applied gate voltage, and the photocurrent through the work is changed.
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