▎ 摘　　要

NOVELTY - Graphite oxide is added to dispersing agent, and the mixture is subjected to microwave-assisted hydrothermal synthesis. The mixture is removed from the reactor and filtered. The filtrate is rotary-evaporated to remove dispersant and dried, to obtain powdery graphene-quantum dots. The powdery graphene-quantum dots are dissolved in distilled water to form a solution. The solution is dripped on substrate having poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate base film. A graphene-quantum-dots film is spin-coated using a spin coater, oven-dried and cured. USE - Preparation of graphene quantum thin film used for solar cell. ADVANTAGE - The method enables economical preparation of graphene quantum thin film having uniform thickness and excellent conductivity, using graphene quantum dots having excellent solubility. DETAILED DESCRIPTION - Graphite oxide is added to predetermined amount of a dispersing agent, and the mixture is provided to 50 mL microwave hydrothermal Teflon (RTM: polytetrafluoroethylene)-lined autoclave, sealed and subjected to microwave-assisted hydrothermal synthesis at microwave power of 400 W and reacted at 200-240 degrees C for 90 minutes. The temperature of mixture is reduced to room temperature, and the mixture is removed from the reactor and filtered. The filtrate is rotary-evaporated to remove dispersant and dried, to obtain powdery graphene-quantum dots. The powdery graphene-quantum dots are dissolved in distilled water to form a solution. The solution is dripped on substrate having poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate base film. A graphene-quantum-dots film is spin-coated using a spin coater, oven-dried and cured.