NOVELTY - The electronic device (1) comprises a first element, a second element and a third element that are sequentially stacked. Each of the first, second and third elements is formed of two-dimensional sheet material. The second element is placed between the first element and the third element, and has an insulator property. One of the first and third elements has a metal property and a layer of graphene, and the other of the first and third elements has a semiconductor property and a graphene monolayer. The first element represents a gate electrode (20) that exhibits the metal property.    USE - The electronic device such as a transistor is useful in a transparent display (all claimed), a foldable portable display and a solar cell.    ADVANTAGE - The electronic device can be easily fabricated with large mobility, improved efficiency and reduced size.    DETAILED DESCRIPTION - The electronic device (1) comprises a first element, a second element and a third element that are sequentially stacked. Each of the first, second and third elements is formed of two-dimensional sheet material. The second element is placed between the first element and the third element, and has an insulator property. One of the first and third elements has a metal property and a layer of graphene, and the other of the first and third elements has a semiconductor property and a graphene monolayer. The first element represents a gate electrode (20) that exhibits the metal property, the second element represents a transparent insulating layer (30), and the third element represents an active channel (40) that exhibits the semiconductor property. The active channel includes a channel region formed of graphene monolayer having a nanoribbon shape. The gate electrode is formed of a graphene multi-layer that is transparent. The gate electrode, the insulating layer and the active channel are formed on a transparent substrate (10). The second element exhibits a transparent characteristic. An INDEPENDENT CLAIM is included for a method of fabricating an electronic device.    DESCRIPTION OF DRAWING(S) - The diagram shows a cross-sectional view of an electronic device.    Electronic device (1)    Substrate (10)    Gate electrode (20)    Insulating layer (30)    Active channel. (40)