▎ 摘　　要

NOVELTY - The device has a gate electrode (152) for applying an electric field to a graphene channel layer (130). First and second junction contact layers (111, 112) contact portions of the graphene channel layer. The first and second junction contact layers are electrically separated from each other. A substrate (101) comprises insulating material. A separation film (120) is formed between the first junction contact layer and the second junction contact layer. The separation film electrically separates the first junction contact layer from the second junction contact layer. USE - Graphene device i.e. transistor (claimed) i.e. FET. ADVANTAGE - The device includes separated junction contacts, so that off-current characteristics are improved. The device ensures that a graphene is spotlighted as next generation material since the graphene is enhanced with stable and high electrical/mechanical/chemical characteristics and high conductivity, and performs switching between an on state and an off state in an easy manner. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a graphene device. Substrate (101) Junction contact layers (111, 112) Separation film (120) Graphene channel layer (130) Gate electrode (152)