▎ 摘　　要

NOVELTY - A graphene oxide aqueous solution is prepared by Hummers method. A substrate is cleaned and dried. A hydroxylamine (hydrochloride) ethanol solution is filled in a container and the graphene oxide aqueous solution is injected. The substrate is placed in the container, graphene oxide is deposited at 0.5-6 mu g/cm2, the substrate is left still for 1 hour, solidified, and heated at low temperature, and the solvent is evaporated to form an N-doped graphene transparent film on the substrate surface. USE - Method for covering surface of substrate e.g. glass, plastic or quartz, with graphene transparent thin film (all claimed) useful as replacement of indium-tin oxide in organic solar cells, touch screens, and dye-sensitized solar cells. ADVANTAGE - The method enables simple formation of large quantities of transparent films having large area, high light transmittance, and high electrical conductivity. DETAILED DESCRIPTION - A graphene oxide aqueous solution with a concentration of 0.01-1 mg/mL is prepared by Hummers method. A substrate is cleaned using 0.5-1.5M hydrochloric acid for 10-50 minutes, washed with water, soaked in 70% alcohol for 5-30 minutes, washed with distilled water, and naturally dried. A hydroxylamine (hydrochloride) ethanol solution with a concentration of 0.02-2 mg/ml is filled in a container and the graphene oxide aqueous solution is injected. The substrate is placed in the container, graphene oxide is deposited at 0.5-6 mu g/cm2, the substrate is left still for 1 hour, solidified, and heated at low temperature, and the solvent is evaporated to form an N-doped graphene transparent film on the substrate surface.