TECHNOLOGY FOCUS - POLYMERS - Preparation (Disclosed): Preparation of (I) comprises reacting thieno(2,3-f)benzothiophene compounds of formula (IA) with heteroaromatic compounds of formula (Z1-D1-Z2) (IB) to obtain thieno(2,3-f)benzothiophene compounds of formula (IC) (representative of (I)).Y1, Y2 = -Sn(CH3)3, -Sn(C4H9)3 or -B(OR)2;R = H or 1-10C-alkyl;n = a degree of polymerization; andZ1, Z2 = -Sn(CH3)3, -Sn(C4H9)3 or -B(OR)2, -Br or -I. Preferred Definitions:    D1 = benzene, furan, imidazole, naphthalene, 1,5-naphthyridine, 1,3,4-oxadiazole, oxazole, pyrazine, pyridazine, pyridine, pyrido(3,4-b)pyrazine, pyrimidine, quinoline, quinoxaline, selenophene, thiazolo(5,4-d)thiazole, thieno(2,3-b)thiophene, thieno(3,2-b)thiophene, thiophene, thiophene 1,1-dioxide, benzo(f)(2,1,3)benzothiadiazole, 2-benzothiophene, dibenzothiophene, furo(3,4-b)pyrazine, isobenzofuran, 1,10-phenanthroline, phenazine, 2,7a-dihydro-1,3-benzoxazole, anthracene, 2,1,3-benzothiadiazole, isoquinoline, 2,3,5,3-dioxa-8-thiabicyclo(4.3.0)nona-1,2,4,6-tetraene, pyrazino(2,3-g)quinoxaline, quinoxaline, thieno(3,4-b)pyrazine, thieno(3,4-b)thiophene, dithieno(3,2-b,2',3'-d)thiophene, thieno(2,3-f)benzothiophene, 5H-thieno(3,2-f)benzothiophene, 2-(2-thienyl)thiophene, benzothiopheno(6,5-f)benzothiophene, 8H-indeno(4,5-g)benzothiophene, pentacene, 1,4,6,9-tetrahydrobenzothiopheno(3,2-b)benzothiophene, 3H-thieno(3,2-g)benzothiophene, or 1,7-dithia-dicyclopenta-anthracene.    EXAMPLE - 0.5 g of 5-Bromo-2-(6-(5-bromo-4-tetradecyl-thiazol-2-yl)-4-(2-ethylhexoxy)-8-(1-ethylpentoxy)thieno(2,3-f)benzothiophen-2-yl)-4-tetradecyl-thiazole and 0.19 g of bis(trimethylstannyl)bithiophene were introduced into a reactor under a nitrogen atmosphere and completely dissolved in anhydrous dimethylformamide while heating at low temperature, and then 44 mg of tetrakis(triphenylphosphine)palladium(0) was added as a polymerization catalyst and reacted at 85?C for 5 hours. 1.4 g of 2-(Tributylstannyl)thiophene was added in excess amount and reacted for 24 hours to obtain a reaction mixture. The reaction mixture was cooled to room temperature of 25 degrees C and filtered to provide a polymer solid. The polymer solid was washed with a hydrochloric acid aqueous solution/chloroform two times, an ammonia aqueous solution/chloroform two times, and water/chloroform two times, and then the polymer was recovered by Soxhlet extraction using methanol, acetone, methylene chloride, and chloroform, and dried to obtain 46% of 2-(4-(2-ethylhexoxy)-8-(1-ethylpentoxy)-2-(2-thienyl)thieno(2,3-f)benzothiophen-6-yl)-4-tetradecyl-thiazole compounds of formula (A).