TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The film manufacturing method is the ink printing method, the spraying method, the soaking method or the rotary coating method. The first preset temperature in the step (c) is 100-135 degrees C. The first preset time in the step (c) is 30 minutes to 2 hours. The second preset temperature in the step (d) is 70-90 degrees C. The second preset time in the step (d) is 30 minutes to 2 hours. Preferred Components: The mixture of the copper indium gallium selenide metal compound comprises cuprous selenide, indium selenide, gallium selenide, cuprous sulfide, indium sulfide, copper indium gallium diselenide, copper indium gallium disulfide, copper indium disulfide, copper indium diselenide, copper gallium disulfide, copper gallium diselenide, copper aluminum disulfide, copper aluminum diselenide, sodium sulfide, sodium acetate, indium acetate, gallium acetate, copper sulfate, indium sulfate, gallium sulfate, copper chloride, indium chloride, gallium chloride and/or seleninic acid.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The diluent scattering agent comprises a diluent and a scattering agent, where the diluent contains deionized water and/or dimethoxy ethanol and the scattering agent contains polyacrylic acid and/or polyvinyl acid. The stable bonding agent comprises a bonding agent, a leveling agent and a stabilizing agent, where the bonding agent contains polyacrylamide and/or polyethylene amide and the stabilizing agent contains diethanolamine, ethanolamine, glycol and/or propylene glycol. The anti-freezing coagulating agent comprises an anti-freeze agent and a delay coagulating agent, where the anti-freeze agent contains ethanol and/or isopropanol and the delay coagulating agent contains glacial acetic acid and/or oxalic acid. The metal reducing agent comprises a reducing agent, a metal chelating agent and a refining metal solvent, where the reducing agent contains ammonia water, sodium hydroxide, potassium hydroxide and/or sodium citrate, the metal chelating agent contains acetylacetone and the refining metal solvent contains oxalic acid.