NOVELTY - Tin-doped zinc oxide powder and zinc oxide sol-gel are mixed in mass ratio of 1:10, 0.05 mL Triton is added, and ground in a mortar for 30 minutes to form slurry uniform without large particle powder. Clean conductive glass is fixed on flat working table by adhesive tape, the slurry is coated on the glass surface, repeated, and uniform coating layer is formed. The coating layer is dried. The product is placed in a muffle furnace, annealed at 450 degrees C for 4 hours, and cooled to room temperature to obtain zinc oxide sol-gel composite tin-doped zinc oxide thick film.    USE - Manufacture of zinc oxide sol-gel composite tin-doped zinc oxide thick film for dye-sensitized solar battery.    ADVANTAGE - The tin-doped zinc oxide powder has mesoporous structures and has large specific surface area, viscosity of the zinc oxide sol is controllable, and the thick film has high adhesive force, uniform granularity, and controllable film thickness. The dye-sensitized solar battery formed using the thick film has improved photovoltaic conversion efficiency.    DETAILED DESCRIPTION - Zinc oxide precursor solution is prepared using triblock copolymer P123 as template, zinc acetate dehydrate as a precursor, tin tetrachloride pentahydrate as a dopant, urea as a buffer, and water as a solvent by hydrothermal method. The concentration of precursor solution is 0.05 mol/L. The molar ratio of zinc and tin is 9:1. The solution is added in an autoclave, insulated at 90 degrees C for 24 hours, the precipitate is dried and annealed at 450 degrees C for 4 hours, and tin-doped zinc oxide powder is obtained. Zinc oxide sol-gel is prepared using P123 triblock copolymer as template agent, zinc acetate dihydrate as precursor, ethanol as solvent, diethanolamine as a stabilizer, and acetylacetone as chelating agent. The concentration of sol-gel precursor solution is 1 mol/L. The volume ratio of ethanol, diethanolamine and acetylacetone is 13:1:2. 10 Wt.% ethyl cellulose is added as a film-forming agent, maintained in oil bath at 70 degrees C for 3 hours, and zinc oxide sol gel is obtained. The powder and sol-gel are mixed in mass ratio of 1:10, 0.05 mL Triton is added, and ground in a mortar for 30 minutes to form slurry uniform without large particle powder. Clean conductive glass is fixed on flat working table by adhesive tape, the slurry is coated on the glass surface with a spoon, repeated, and uniform coating layer is formed. The coating layer is dried at 90 degrees C for 30 minutes, 120 degrees C for 2.5-3 hours, and 160 degrees C for 2 hours. The product is placed in a muffle furnace, annealed at 450 degrees C for 4 hours, and cooled to room temperature to obtain zinc oxide sol-gel composite tin-doped zinc oxide thick film.