▎ 摘　　要

NOVELTY - The graphene laminate has an upper piezoelectric material layer (100) that includes a negatively-charged surface (110) and a positively-charged surface (120). An upper graphene layer (200) locates under the upper piezoelectric material layer, and contacts the positively-charged surface of the upper piezoelectric material layer. A lower graphene layer (300) locates under the upper graphene layer. A lower piezoelectric material layer (400) positions under the lower graphene layer, and includes negatively-charged surface (410) and the positively-charged surface (420). USE - Graphene laminate for use in switching device e.g. transistors and sensor device (all claimed). Can also be used in high frequency device and optical device. ADVANTAGE - The device with faster information-processing ability than conventional silicon (Si)-based devices can be manufactured using the graphene laminate with high charge-mobility. Since the dipoles in a piezoelectric material layer are artificially oriented in a direction by applying a strong electric field to the piezoelectric material layer, the permanent dipoles charging the opposite surfaces of the piezoelectric material layer with positive charges and the other surface with negative charges is facilitated. The manufacturing of a device is made simple, since the additional insulating layer is not formed. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a graphene laminate with a band gap. DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a graphene laminate. Upper piezoelectric material layer (100) Negatively-charged surface of upper piezoelectric material layer (110) Positively-charged surface of upper piezoelectric material layer (120) Upper graphene layer (200) Lower graphene layer (300) Lower piezoelectric material layer (400) Negatively-charged surface of lower piezoelectric material layer (410) Positively-charged surface of lower piezoelectric material layer (420)