TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: (A) is prepared by providing 7,7'-dibromo-5,5'-diiodo-(4,4')bi(benzo(1,2,5)thiadiazolyl) (C) and an alkyne compound of formula (R2-CC-R3) (E) in a protective gas atmosphere in a solvent containing an organic base comprising triethylamine and a catalyst comprising palladium acetate for the ring closure reaction, then separation and purification of (A), where the molar ratio of (C) and (E) is 1:2. After the ring closure reaction of (C) and (E), reaction solution was extracted with dichloromethane, washed using the washout, the organic layer was retained, dried over anhydrous sodium sulfate, filtered, and the solvent was distilled off using silica gel column chromatography to obtain (A). Preferred Components: The organo palladium catalyst is tetrakis(triphenyl phosphine) palladium, and the mole ratio of the organo palladium catalyst with the compound (A) is 1:2000-1:5. The alkali compound is sodium carbonate and the mole amount of the aqueous solution of the alkali compound is 2-20 times that of the compound (B). The organic solvent is tetrahydrofuran, dimethyl ether, benzene and/or toluene.    TECHNOLOGY FOCUS - POLYMERS - Preparation (Claimed): Preparation of (I) comprises Suzuki coupling reaction of a 1,6-dibromo-8,11-dithia-7,9,10,12-tetraaza-dicyclopenta(c,g)phenathrene compound of formula (A) and a 1,8-bis-(4,4,5,5-tetramethyl-(1,3,2)dioxaborolan-2-yl)-9H-carbazole compound of formula (B) in the presence of an organo palladium catalyst and an aqueous solution of alkali compound in an organic solvent to give (I), separating and purifying (I), where the mole ratio of compounds (A) and (B) is 1:1.5-1.5:1. Preferred Process: The reaction temperature for the Suzuki coupling reaction is 50-120 degrees C and the reaction time is 6-108 hours. The separation and purification of (I) comprises adding a solution of toluene and deionized water to the Suzuki coupling reaction mixture, extracting the mixture, retaining the organic phase, adding an organic solvent comprising ethanol, precipitating the product and filtering, where the resulting solid is dried and the powder is dissolved in chloroform, subjected to column chromatography over silica gel, the organic solvent is removed and the product is precipitated again with methanol and filtered, after filtration the resulting solid is extracted with acetone, the acetone solution is collected and precipitated with methanol and filtered.