TECHNOLOGY FOCUS - POLYMERS - Preparation (Claimed): Preparation of the polymer of formula (-(A)-(COM1)n-) comprises reacting a dihalogenide of formula (X10-A-X10) with an equimolar amount of a diboronic acid or diboronate of formula (X11-(COM1)-X11) or reacting dihalogenide of formula (X10-(COM1)-X10) with an equimolar amount of a diboronic acid or diboronate of formula (X11-A-X11) in a solvent and in the presence of a catalyst or reacting a dihalogenide of formula (X10-A-X10) with equimolar amount of an organo tin compound of formla (X11a-(COM1)-X11a) or reacting a dihalogenide of formula (X10-(COM1)-X10) with an equimolar amount of organo tin compound of formula (X11a-A-X11a).X10 = halo (preferably Br);X11 = -B(OH)2, -B(OY1a)2, substituted phenyl boronic acid moiety (Va) or boronic acid moiety (Vb);X11a = SNR207R208R209;A = (I);COM1 = repeating unit, which is Ar2 or -(Ar14)k-(Ar15)l-(Ar16)r-(Ar17)z-;k, l = 1;r, z = 0 or 1;Ar14, Ar15, Ar16, Ar17 = substituted thiophenyl moiety of formula (IIa), heterocyclic moiety of formula (IIb), substituted thieno-thiophenyl moiety of formula (IIc) or (IId) or thiazolo(5,4-d)thiazol-2,5-diyl;one of X5, X6 = N; andother of X5, X6 = CR14;R14, R14a, R17, R17a = H or 1-25C alkyl, preferably 6-25C alkyl (optionally interrupted by at least one O); andn = 4-1000, preferably 5-100 or 5-150.Preferred Components: (I) is e.g. substituted fused cyclic compounds of formula (Ia) and (Ib). The polymer comprises repeating units of formula (-(A)- and -(COM1)-). The polymer is e.g. of formula (IIe) and (IIf). Full Definitions:    Y1 = substituted fused tricyclic moiety of formula (II) or (III);    a, a1 = 1-3;    b, c, d, b1, c1, d1 = 0-3, preferably b, c, d, b1, c1, d1 is 0 or b, b1 is 1-3;    U1 = O, S or NR1;    U2 = O, S or NR2;    T1, T2 = H, halo, OH, CN, COOR103, OCOR R103, NR112COR103, CONR112COR103, OR103a, SR103a, SOR103a, SO2R103a, NR112SO2R103a, NR112R113, 1-25C alkyl (optionally substituted by E and/or interrupted by D), 5-12C cycloalkyl (optionally substituted with 1-3 of 1-8C alkyl and/or 1-8C alkoxy), 7-25C arylalkyl, 6-24C aryl or 2-20C heteroaryl (both optionally substituted by G);    R1, R2 = H, 1-100C alkyl, COOR103, COR103, 1-100C alkyl (optionally substituted by at least one halo, OH, NO2, CN or 6-18C aryl and/or interrupted by O, COO, OCO or S), 7-100C arylalkyl (optionally substituted with 1-3 of 1-8C alkyl and/or 1-8C alkoxy), carbamoyl, 5-12C cycloalkyl (optionally substituted with 1-3 of 1-8C alkyl and/or 1-8C alkoxy), 6-24C aryl (preferably phenyl or 1- or 2-naphthyl) (optionally substituted with 1-3 of 1-8C alkyl, 1-8C thioalkoxy and/or 1-8C alkoxy) or pentafluorophenyl;    R103, R103a = 1-100C alkyl (preferably 3-25C alkyl), 1-25C alkyl (optionally substituted by E and/or interrupted by D), CF3, 7-25C arylalkyl, 6-24C aryl or 2-20C heteroaryl (both optionally substituted by G);    Ar2, Ar3, Ar4, Ar2a, Ar3a, Ar4a = Ar1 or substituted fused heterocyclic moieties of formula (Xa)-(Xz), (X1a), (X1b), (X1c), (X1d), (X1g), (X1h), (X1i), (X1j) or (X1k), 2,3-dihydro-thien-5,7-diyl(3,4-b)(1,4)dioxine, 2,3-dihydro-thien-5,7-diyl(3,4-b)(1,4)dithiine, -CC-, -C(R104)=C(R104a)- or -C(R104)=C(R104a)-;    R3, R3a = H, halo, halogenated 1-25C alkyl (preferably CF3), CN, 1-25C alkyl (preferably 3-25C alkyl) (optionally interrupted by at least one O or S), 7-25C arylalkyl or 1-25C alkoxy;    R104, R104a = H, CN, COOR103 or 1-25C alkyl;    R4, R4a, R5, R5a, R6, R6a = H, halo, halogenated 1-25C alkyl (preferably CF3), CN, 1-25C alkyl (preferably 3-25C alkyl) (which is optionally interrupted by at least one O or S), 7-25C arylalkyl or 1-25C alkoxy;    R114 = 1-25C alkyl (preferably 3-25C alkyl), which is optionally interrupted by at least one O or S;    R7, R7a, R9, R9a = H, 1-25C alkyl (preferably 3-25C alkyl) (which is optionally interrupted by at least one O or S) or 7-25C arylalkyl;    R8, R8a = H, 6-18C aryl (optionally substituted by 1-18C alkyl or 1-18C alkoxy), 1-25C alkyl (preferably 3-25C alkyl and is optionally interrupted by at least one O or S) or 7-25C arylalkyl;    R11, R11a = 1-25C alkyl (preferably 1-8C alkyl), 7-25C arylalkyl or phenyl (optionally substituted with 1-3 of 1-8C alkyl and/or 1-8C alkoxy);    R12, R12a = H, halo, CN, 1-25C alkyl (preferably 3-25C alkyl) (optionally interrupted by at least one O or S), 1-25C alkoxy, 7-25C arylalkyl or -CC-R13;    R13 = 1-10C alkyl or tri(1-8C alkyl)silyl;    Ar1, Ar1a = substituted phenyl moiety of formula (XVa), substituted naphthyl moiety of formula (XVb) or (XVc), substituted carbazole moiety of formula (XVd), substituted fluorenyl moiety of formula (XVe), 6,12-dihydro-indeno(1,2-b)fluorenyl compounds of formula (XVf), substituted biphenyl moiety of formula (XVg) or 4,7-diyl-benzo(1,2,5)thiadiazole;    R105, R105a, R16, R106a = H, halo, CN, 1-25C alkyl (optionally interrupted by at least one O or S), 7-25C arylalkyl or 1-18C alkoxy;    R107 = H, 7-25C arylalkyl, 6-18C aryl (optionally substituted by 1-18C alkyl or 1-18C alkoxy), 1-18C perfluoroalkyl, 1-25C alkyl (preferably 3-25C alkyl) (optionally interrupted by O or S), COOR103; either    R108, R109 = H, 1-25C alkyl (optionally substituted by E and/or D), 7-25C arylalkyl, 6-24C aryl or 2-20C heteroaryl (both optionally substituted by G),2-18C alkenyl, 2-18C alkynyl, 1-18C alkoxy (optionally substituted by E and/or interrupted by D) or 7-25C aralkyl; or    R108R109 = =CR110R111 or 5-6 membered ring (optionally substituted by 1-18C alkyl (optionally substituted by E and/or interrupted by D), 6-24C aryl or 2-20C heteroaryl (both optionally substituted by G), 2-18C alkenyl, 2-18C alkynyl, 1-18C alkoxy (optionally substituted by E and/or interrupted by D) or 7-25C aralkyl);    R110, R111 = H, 1-18C alkyl (optionally substituted by E and/or interrupted by D), 6-24C aryl or 2-20C heteroaryl (both optionally substituted by G);    D = CO, COO, S, O or NR112;    E = 1-8C thioalkoxy, 1-8C alkoxy, CN, NR112R113, CONR112R113 or halo;    G = E or 1-18C alkyl; and    R112, R113 = H, 6-18C aryl (optionally substituted by 1-18C alkyl or 1-18C alkoxy) or 1-18C alkyl (optionally interrupted by O).    EXAMPLE - 3,7-Bis-(4-(5-bromo-4-octyl-thiophen-2-yl)-phenyl)-benzo(1,2-b;4,5-b')difuran-2,6-dione (200 mg) and thiophene diboronic ester (76 mg), tris(dibenzylideneacetone)dipalladium(0) (6.2 mg) and tri-tert-butylphosphine (3 mg) were dissolved in fresh tetrahydrofuran (20 ml). The mixture was degassed and heated to reflux under nitrogen. A solution of potassium carbonate (125 mg) in water (2 ml) was added and the reaction mixture was heated for 2 hours. After cooling, the reaction mixture was diluted with dichloromethane (50 ml), washed with brine and water. The organic phase was dried, the solvent was removed. The product was precipitated in methanol to give poly(3-(4-(3-octyl-(2,2')bithiophenyl-5-yl)-phenyl)-7-(4-(4-octyl-thiophen-2-yl)-phenyl)-benzo(1,2-b;4,5-b')difuran-2,6-dione) (71%).