TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: Catalyst is organic palladium, or a mixture of organic palladium and organic phosphine ligand in a molar ratio of 1:2-1:20. Organic palladium is tris(dibenzylideneacetone)palladium, tetrakis(triphenylphosphine)palladium or bis(triphenylphosphine)palladium dichloride. Organic phosphine ligand is tri(methylphenyl)phosphine. Organic solvent is tetrahydrofuran, N,N-dimethylformamide or toluene.    TECHNOLOGY FOCUS - POLYMERS - Preparation (claimed): Carbazole-benzodiazepin thiophene conjugated polymer is prepared by carrying out Stille reaction of thiophene derivative (A) of formula (Ia) and dibromocarbazole derivative (B) of formula (Ib) in an organic solvent and catalyst at 60-120 degrees C for 24-72 hours under oxygen-free atmosphere, evaporating to remove excess of organic solvent, adding resultant liquid to methanol, washing obtained solid with methanol, filtering, purifying using column chromatography in which alumina is used as adsorbent, then rinsing with chloroform, evaporating to remove organic solvent, adding resultant liquid to methanol, collecting solid, extracting using acetone by Soxhlet extractor for 3 days, collecting aqueous phase, adding aqueous phase to methanol, and filtering using vacuum pump filter. The molar ratio of compound (A) and compound (B) is 1:1-1.5:1. Preferred Process: Compound (A) is prepared by adding lithium diisopropylamide solution to phosphorus compound (C) of formula (III) at -78 degrees C under protective gas atmosphere, reacting for 2-3 hours, adding 4,10-dithiatricyclo(7.3.0.03,7)dodeca-1(9),3(7),5,11-tetraene-2,8-dione (D), carrying out Wittig-Horner reaction at room temperature for 12-15 hours, separating and purifying to obtain dithiophene derivative (E) of formula (IV), adding n-butyllithium to organic solution of compound (E) at -78 degrees C under protective gas atmosphere, stirring for 2-3 hours, adding trimethyltin chloride and reacting at room temperature for 20-24 hours. Compound (B) is prepared by adding ammonium chloride solution of 4-(2,7-dibromo-9H-carbazol-9-yl)benzaldehyde (F) to ethanol solution of thiazolidine-2,4-dione derivative (G) of formula (IV), refluxing at 80 degrees C for 2-3 hours, filtering reaction liquid, collecting residue, washing using distilled water and ethanol, and recrystallizing with anhydrous ethanol. The addition amount of catalyst is 0.01-5 mol% based on content of compound (B). The molar ratio of lithium diisopropylamide and compound (C) is 1:1-1.5:1. The molar ratio of compound (D) and compound (C) is 1:2-1:2.5. The molar ratio of n-butyllithium and compound (E) is 2.2:1-2.5:1. The molar ratio of trimethyltin chloride and compound (E) is 2:1-2.5:1. The molar ratio of compound (F) and ammonium chloride is 0.7:1-0.9:1. The molar ratio of compound (F) and compound (G) is 1:1-1:1.5.