▎ 摘　　要

NOVELTY - The transistor has an insulating film that is arranged between a graphene and a low resistance substrate. The insulating film is provided with homogeneous composition and a dielectric constant. The basic element of insulating film is different from the basic element of the substrate. The thickness of insulating film is provided interference contract to observe the graphene with an optical microscope. USE - Graphene transistor such as top-gate-type graphene transistor and bottom-gate-type graphene transistor. ADVANTAGE - The reproducibility of insulating film can be improved, since insulating film is provided with homogeneous composition and dielectric constant. Hence, thickness of insulating film can be controlled. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the graphene transistor. (Drawing includes non-English language text)