TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: Organic solvent is tetrahydrofuran, ether, and/or toluene.    TECHNOLOGY FOCUS - POLYMERS - Preferred Method: Stille coupling polymerization reaction comprises placing the 2,5-di(tributyl tin)-3,4-ethylenedioxythiophene monomer, N,N'-di-(2',6'-diisopropyl phenyl)-2,6-dibromonaphthalene-1,4,5,8-tetracarboxylic acid diimide monomer, and catalysts tri(dibenzylideneacetone)dipalladium(0), arsenic triphenyl and cuprous iodide in anaerobic environment containing tetrahydrofuran solvent, reacting in sealed oil bath, and performing post-treatment for purifying and realizing the reaction. Anaerobic environment is long-neck sealed reaction bottle having branched opening vacuumized by double tube banks, and is treated by filling into nitrogen, vacuumized again and is repeatedly treated for 3 times for completely removing oxygen in the system. Reaction in a sealed oil bath comprises introducing positive-pressure nitrogen into mixed solution of the 2,5-di(tributyl tin)-3,4-ethylenedioxythiophene monomer and N,N'-di-(2',6'-diisopropyl phenyl)-2,6-dibromonaphthalene-1,4,5,8-tetracarboxylic acid diimide monomer and deoxidizing for 20 minutes by bubbling; completely sealing reaction bottle by sealing band, heating to 80 degrees C by oil bath for reacting, and keeping for 72 hours. Operation of the post-treatment comprises extracting the product filtrate obtained by Stille coupling polymerization reaction by dichloromethane, after concentrating, performing Soxhlet extraction for purifying and obtaining the product. Operation of the post-treatment preferably comprises extracting and filtering for removing insoluble grey white substance obtained by Stille coupling polymerization reaction, extracting filtrate by dichloromethane for 3 times, and drying combined organic layer by anhydrous sodium sulfate; filtering, vacuum evaporating in rotary manner for concentrating filtrate, and adding into methanol; precipitating and standing, and filtering to obtain blue solid substance; purifying blue solid substance by Soxhlet extraction and taking methanol as solvent for purifying; taking n-hexane as solvent for purifying, and separately purifying for 1 day; and vacuum drying obtained product at 45 degrees C and staying overnight for obtaining random copolymer or alternate copolymer.