TECHNOLOGY FOCUS - POLYMERS - Preparation: No general preparation is given. Preferred Composition: The annulated thienyl-vinylene-thienyl unit is of formula (I)-(IV). The polymer comprises repeating unit of formula (R1) and repeating unit of formula (R2). The repeating unit (R1) and repeating unit (R2) are arranged in an alternating or random manner. The polymer is of formula (P1).A=group of formula (a);P-1'=group of formula (6) or 7;P-2=conjugated polycyclic moiety chosen from 46 moieties e.g. moieties of formula (1)-(5);Re=H, F, Cl, -CN, R, -OR, -SR, -C(O)R, -OC(O)R, -C(O)OR or Rf;Rf=6-20C aryl or 5-20C heteroaryl optionally substituted by F, Cl, -CN, R, -OR or -SR;R=1-10C alkyl, 1-40C haloalkyl, 2-40C alkenyl or 2-40C alkynyl;P-1=annulated thienyl-vinylene-thienyl unit;P-2'=covalent bond or optionally substituted conjugated polycyclic moiety;R1',R2'=H, halo, CN, 1-40C alkyl, 2-40C alkenyl or 1-40C haloalkyl;Z=-CC-, -N=C(R4), -N=N- or -C(-R4)=C(-R4)-;R4=H, halo, CN, 1-40C alkyl, 1-40C haloalkyl, 1-40C alkoxy or 1-40C alkylthio;Sp1,Sp2,Sp3=-(Ar')m-, -Z-, -(Ar')m-Z- or -(Ar')m-Z-(Ar')m-;Z,Z'=conjugated linear linker;m=1-5;Ar'=monocyclic 5- or 6-membered aryl or heteroaryl optionally substituted with 1-4 R3;andR3=halo, CN, oxo, =C(CN) 2, 1-40C alkyl, 1-40C haloalkyl, 1-40C alkoxy or 1-40C alkylthio.Preferred Composition: The electron-acceptor compound is fullerene compound or electron-transporting polymer. EXAMPLE - 98.4 mg Mixture of 4,8-Bis-(2-butyl-octyloxy)-2,6-bis-bromo-1,5-dithia-s-indacene, 78.3 mg trimethyl((4-((4E)-2-(trimethylstannyl)-4H,5H,6H-cyclopenta(b)thiophen-4-ylidene)-4H,5H,6H-cyclopenta(b)thiophen-2-yl))stannane and 2.5 mg tris(dibenzylideneacetone)dipalladium and 6.7 mg in 10 mL anhydrous chlorobenzene was stirred at 130 degrees C for 17 hours under argon atmosphere. 0.2 mL Bromobenzene was then added, reaction mixture was maintained at 130 degrees C for 4 hours, cooled to room temperature and precipitated in 50 mL methanol. The crude product was collected by filtration and washed with methanol. The obtained solid product was subjected to Soxhlet extraction with methanol, acetone, hexane and chloroform, and the resultant extract was concentrated to 5 mL, filtered, and precipitated in 50 mL methanol. The precipitate was collected by filtration, washed with methanol, and dried in vacuum, too obtain 63.1 mg deep purple solid polymer of formula (E1) with yield of 56.4%.    n=3-5000.