▎ 摘　　要

NOVELTY - The graphene Schottky varactor diode comprises a graphene channel that is formed on a substrate, and Schottky contacts. The graphene Schottky varactor diode is essentially free from dark currents. The graphene Schottky varactor diode is adapted to rectify transfer curves with a voltage threshold of at least 0.1 volts, provide a photoresponse increase with modulation frequency, provide a photoresponse of pure graphene of at least 100 milliampere per watt, and provide a photoresponse independent from direct current bias. USE - Graphene Schottky varactor diode for high-performance photodetection. ADVANTAGE - The graphene Schottky varactor diode includes a low-gap semiconductor located under the graphene channel, which enhances the photoresponse of the diode. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a process for preparing a graphene Schottky varactor diode. DESCRIPTION OF DRAWING(S) - The drawing shows the microscopic view of the transfer-length modulated graphene Schottky varactor diodes.