▎ 摘　　要

NOVELTY - The graphene transistor has a graphene layer (3) that is made of graphene. The drain electrode (21) and source electrode (22) are electrically connected with the graphene layer. An electric charge donator is arranged on a main surface of the graphene layer, and is provided with an impurity electric charge. An impurity electric charge of counter ions is provided with a code different from the electric charge. USE - Graphene transistor such as graphene FET. ADVANTAGE - The time-dependent change of the characteristic of the graphene layer is suppressed. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a manufacturing method of the graphene transistor. DESCRIPTION OF DRAWING(S) - The drawing shows a sectional diagram of the graphene transistor. Insulated substrate (1) Graphene layer (3) Insulated foreign material (4) Drain electrode (21) Source electrode (22)