TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The catalyst is metal powder comprising silver powder, copper powder, stannum powder, iron powder, cobalt powder and/or nickel powder; metal oxide powder comprising titanium oxide powder, copper oxide powder and/or iron oxide powder; or metal salt comprising cobalt salt, stannum salt, copper salt, nickel salt and/or zinc salt.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: In the device: a thickness of the electron donor layer is 1-100 nm; a material of the electron acceptor layer is fullerene or its derivative, poly(phenylene vinylene) derivative, triazole derivative and/or organosilane derivative; and a thickness of the electron acceptor layer is 1-100 nm. Preferred Method: The electron acceptor layer is made by: dispersing fullerene or fullerene derivatives in a second solvent to form a second solution; uniformly coating the second solution on the electron donor layer; and removing the second solvent from the second solution, where the second solvent is chloroform, chlorobenzene, cyclohexane and/or toluene. In the method, heating temperature is 80-300 degrees C and a heating period is 5 minutes-20 days. The method further comprises removing the catalyst after forming the conjugated polymer solution.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The cyclized polyacrylonitrile: comprises conjugated typed C=N or C=C double bonds; absorbs UV light having a wavelength of 300-600 nm or visible light having a wavelength of larger than 600 nm; and is soluble in an organic solvent. The conjugated polymer layer further comprises photoelectric catalyst particles uniformly dispersed in the cyclized polyacrylonitrile, where the photoelectric catalyst particles are titanium oxide particles. Preferred Method: The conjugated polymer is made by: providing polyacrylonitrile, a solvent and a catalyst; dissolving the polyacrylonitrile in the solvent to form a polyacrylonitrile solution; uniformly dispersing the catalyst into the polyacrylonitrile solution; and heating the polyacrylonitrile solution with the catalyst dispersed to induce a cyclizing reaction of the polyacrylonitrile, thus forming a conjugated polymer solution having a conjugated polymer dissolved in it, where the solvent is a polar organic solvent comprising dimethyl formamide, dimethylacetamide, dimethyl sulfoxide, malononitrile, sulfolane and/or ethyl nitrite, a mass concentration of the polyacrylonitrile solution is 0.1-10%, and a mass ratio of the catalyst to the polyacrylonitrile is 1:0.2-1:6. EXAMPLE - Silver powder (as catalyst) with particle diameter of 100 mu m and polyacrylonitrile (PAN) (5 mass%) were dispersed in a ratio of 1:2.5. The silver powder dispersed PAN solution was heated to150 degrees C by an oil bath along with agitating the PAN solution at a rotating speed of 500 rpm, where the first solvent in PAN was dimethyl formamide. The PAN solution was heated for 12 hours to cyclize the PAN until the solution became black, thus forming the conjugated polymer. Then the silver powder was separated out using the filter gauze, and the first solvent is separated out using the solvent filter to form the conjugated polymer.