TECHNOLOGY FOCUS - POLYMERS - Preparation (Claimed): Preparation of (A) comprises coupling (VI) with each other and/or with one or more aryl monomers of formulae (R7-(Ar1)a-(Ac1)-(Ar2)c-R8) (C), (R7-Ar1-R8) (D) and (R7-Ar3-R8) (E). Preferred Components: (A) comprises: one or more aryl units of formula (-((Ar1)a-(U1)b-(Ar2)c-(Ar3)d)-) (II); aryl or heteroaryl derivatives of formula (-((A)x-(B1)y)n-) (IV); and alkane derivative of formula (R5-chain-R6) (V). (A) further comprises one or more aryl or heteroaryl repeating units of formula (-((Ar1)a-(Ac1)b-(Ar2)c-(Ar3)d)-) (III). The mixture or polymer blend comprises the polymers and one or more n-type organic semiconductor compounds. The n-type organic semiconductor compound is optionally substituted fullerene.Ac1 = aryl or heteroaryl that is different from U1 or Ar1-Ar3, has 5-30 ring atoms optionally substituted by one or more substituent of Rs1, and the aryl or heteroaryl has electron acceptor properties, where the polymer comprises at least one repeating unit of (III) (where b is 1);a-c = 0-2;d = 1-10;A = A1;B1 = different from A, one or more aryl or heteroaryl groups that are optionally substituted;x = greater than 0 or less than or equal to 1;y = greater than or equal to 0 or less than 1, where x+y is 1;n = greater than 1;chain = polymer chain;R5, R6 = R1, H, F, Br, Cl, I, -CH2Cl, -CHO, -CRa1=CRa22, -SiRa1Ra2Ra3, -SiRa1Xa1Xa2, -SiRa1Ra2Xa1, -SnRa1Ra2Ra3, -BRa1Ra2, -B(ORa1)(ORa2), -B(OH)2, -O-SO2-Ra1, -C-CH, -C-C-Si(Ra1)3, -ZnXa1, or an endcap group;Xa1, Xa2 = halo; andRa1-Ra3 = R1a; orRa1Ra2Ra3+hetero atom = a ring. EXAMPLE - 66.9 mg of 1-Bromo-pyrrolidine-2,5-dione was added portion wise to a solution of 300 mg of benzo(1,2-b:4,5-b')-did-(4,4-bis-(4-dodecylphenyl)-4H-cyclopenta(2,1-b:3,4-b')dithiophen-2-yl) in 40 cm3 of anhydrous tetrahydrofuran under a nitrogen atmosphere with absence of light at 0 degrees C to obtain a reaction mixture. The reaction mixture was stirred at 23 degrees C for 17 hours. The reaction mixture was concentrated in vacuum to give 280 mg of benzo(1,2-b:4,5-b')-di-(2-bromo(4,4-bis-(4-dodecylphenyl)-4H-cyclopenta(2,1-b:3,4-b')dithiophen-2-yl)). Nitrogen gas was bubbled through a mixture of 260 mg of benzo(1,2-b:4,5-b')-di-(2-bromo(4,4-bis-(4-dodecylphenyl)-4H-cyclopenta(2,1-b:3,4-b')dithiophen-2-yl)) and 84.5 mg of 5,5'-bis-trimethylstannanyl-(2,2')bithiophenyl in 4 cm3 of anhydrous toluene and 0.5 cm3 of N,N-dimethylformamide for one hour to obtain a reaction mixture. 6.3 mg of Tris(dibenzylideneacetone)dipalladium(0) and 8.4 mg of tri(o-tolyl)phosphine were added to the reaction mixture followed by heating at 100 degrees C for 17 hours. The reaction mixture was poured into 100 cm3 of methanol and the polymer precipitate was collected by filtration. The crude polymer was subjected to methanol, acetone, petroleum having a temperature of 40-60 degrees C, petroleum having a temperature of 80-100 degrees C, cyclohexanes and chloroform. The chloroform extract was poured into 100 cm3 of methanol and the polymer precipitate was collected by filtration to give 150 mg of poly(2,17-(benzo(1,2-b:4,5-b')-di-(4,4-bis-(4-dodecylphenyl)-4H-cyclopenta(2,1-b:3,4-b')dithiophen-2-yl)))-alt-(2,2'-bithiophene).