▎ 摘　　要

NOVELTY - Single-crystal graphene sheet (410) comprises a polycyclic aromatic molecule and 1-300 layers, where: many carbon atoms are covalently bound to each other to form a single-crystal; and a peak ratio of a Raman D band intensity to a Raman G band intensity is less than or equal to 0.2. USE - (I) is useful in a transparent electrode (claimed) in electrical devices or electromagnetic devices including display devices and solar cells. ADVANTAGE - (I) does not have any defects, hence a peak ratio of a Raman D band intensity to a Raman G band intensity is less than or equal to 0.2, preferably 0. (I) has uniform shape and can be produced economically and reproducibly. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing single-crystal graphene sheet (I), comprising: forming a catalyst layer comprising a single-crystal graphitizing metal catalyst sheet; disposing a carbonaceous material on the catalyst layer; and heat-treating the catalyst layer and the carbonaceous material in at least one of an inert atmosphere and a reducing atmosphere to form (I). DESCRIPTION OF DRAWING(S) - The figure shows a structure of a single-crystal graphene sheet formed on a catalyst layer. Single-crystal graphene sheet. (410)