TECHNOLOGY FOCUS - POLYMERS - Preparation (Claimed): Preparation of (Q) comprises carrying out Suzuki or Stille polycondensation reaction to link the monomers. Preferred Definitions:    Ar1, Ar2 = 108 (hetero)aryl groups e.g. benzene, naphthalene, fluoren-9-one, anthracene, pyrene, perylene, 4,7-bis-(2,2')bithiophenyl-5-yl-benzo(1,2,5)thiadiazole, 7,7'-di-thiophen-2-yl-(4,4')bi(benzo(1,2,5)thiadiazolyl), 3,8-dithia-dicyclopenta(a,f)naphthalene, thiazolo(5,4-d)thiazole, benzo(1,2-d,4,5-d')bisthiazole, divalent heterocyclic group of formula (A)-(D) or divalent aromatic amine group of formula (A1)-(D1); and    R5 = H or 1-20C-alkyl.    EXAMPLE - 922 mg of 2-Bromo-5-(16-(5-bromo-4-(1-ethylpentyl)-2-thienyl)-15b,15c-dihydropyranthren-8-yl)-3-(2-ethylhexyl)thiophene and 657.6 mg of 9-(1-octyl-nonyl)-2,7-bis-(4,4,5,5-tetramethyl-(1,3,2)dioxaborolan-2-yl)-9H-fluoren-9-ol were introduced into a 50 ml round-bottom three necked flask equipped with a thermometer and reversed condenser. 25 ml of Toluene, 2 ml of 2 molar aqueous solution of potassium carboante, 5 ml of anhydrous ethanol, 1 drop of Aliquat 336 (RTM: Starks' catalyst) and 10 mg of tetrakis(triphenylphosphine)palladium(0) were added. The reaction mixture was deaerated using repeating cycles of freezing in liquid nitrogen, evacuation, filling with argon and heating up to room temperature. The reaction flask with the deaerated mixture of reagents was immersed into an oil bath and heated at reflux for 12-24 hours. The molecular weight characteristics of the formed product were controlled every 30 minutes. The reaction was stopped when the weight average molecular weight showed no increase within 3 hours. The mixture was cooled down to the room temperature and extracted with 500 ml of toluene. The resulting solution was washed 3 times with 250 ml of deionized water, dried and concentrated in vacuum (rotary evaporator) to 40 ml. The obtained crude polymer was precipitated by the addition of 150 ml of methanol and subsequently purified using several additional dissolving/precipitation cycles. Finally, the precipitated polymer flakes were filtered out and dried in vacuum to yield 70-80% of purified 2-(3-(2-ethyl-hexyl)-5-(16-(4-(2-ethyl-hexyl)-5-phenyl-thiophen-2-yl)-15d,15e-dihydro-pyranthren-8-yl)-thiophen-2-yl)-9-(1-octyl-nonyl)-7-phenyl-9H-carbazole polymer of formula (Qa) with weight average molecular weight of 9000 g/mole and number average molecular weight of 5300 g/mole.