TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No preparation method is given.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polymer comprises (repeating) unit(s) of substituted compounds of formula (-A-) and (-COM1-).A = repeating unit of (I).(III) is e.g. substituted 2,5-dihydropyrrolo(3,4-c)pyrrole-1,4-dione compounds of formula (IIIa). Full Definitions:    a, x, b, y, c, z = 0-3;    R1, R2 = 1-100C alkyl, 2-100C alkenyl, 3-100C alkinyl, 3-12C cycloalkyl, CO-1-18C alkyl, CO-5-12C cycloalkyl or -COO-1-18C alkyl (all optionally substituted by at least one time with 1-12C alkyl, 1-12C alkoxy, halo, 5-12C cycloalkyl, nitro, CN, vinyl, allyl, 6-24C aryl, 2-20C heteroaryl, or E1Si- and/or optionally interrupted by -O-, -S-, -NR39-, -COO-, -CO-, -OCO-, 6-24C arylene, 2-20C heteroarylene, 3-12C cycloalkylene, or D1-Si-1), 6-24C aryl or 2-20C heteroaryl (both optionally substituted by at least one time with 1-12C alkyl, 1-12C alkoxy, halo, 5-12C cycloalkyl, nitro, CN, vinyl, allyl, 6-24C aryl, 2-20C heteroaryl or E1Si-);    E1Si- = -SiR161R162R163 or -O-SiR161R162R163;    D1Si-1 = -SiR161R162-, -SiR161R162-(O-SiR161R162)d- or -O-SiR161R162-;    R161-R163 = H, 1-25C alkyl or 3-12C cycloalkyl (optionally substituted by 1-4C alkyl), 1-25C haloalkyl, 2-25C alkenyl, -O-SiR164R165R166, -(O-SiR164R165)d-R166, 1-25C alkoxy, 3-24C(hetero)aryloxy, NR167R168, halo, 1-25C acyloxy, phenyl (substituted 1-3 times by 1-24C alkyl, halo, CN or 1-25C alkoxy);    R164-R166 = H, 1-25C alkyl, 3- 12C cycloalkyl (optionally substituted with 1-4C alkyl), 1-25C haloalkyl, 2-25C alkenyl, -O-SiR169R170R171, -(O-SiR169R170)d-R171, 1-25C alkoxy, 3-24C-(hetero)aryloxy, NR167R168, halo, 1-25C acyloxy, phenyl (optionally substituted 1-3 times by 1-24C alkyl, halo, CN or 1-25C alkoxy);    R169-R171 = H, 1-25C alkyl, 3-12C cycloalkyl (optionally substituted with 1-4C alkyl), 1-25C haloalkyl, 2-25C alkenyl, -O-Si(CH3)3, 1-25C alkoxy, 3-24C(hetero)aryloxy, NR167R168, halo, 1-25C acyloxy, phenyl (optionally substituted 1-3 times by 1-24C alkyl, halo, CN or 1-25C alkoxy);    R167, R168 = 6-18C aryl (optionally substituted by 1-18C alkyl, or 1-18C alkoxy) or 1-25C alkyl (optionally interrupted by at least one O or S), 7-25C arylalkyl or H;    d = 1-50;    R39 = 1-18C alkyl, 1-18C haloalkyl, 7-25C arylalkyl, 1-18C alkanoyl or H;    Ar1, Ar2, Ar3, Ar1a, Ar2a, Ar3a = (1,3)thiazolo(5,4-d)(1,3)thiazole-2,5-diyl, 2,3-dihydrothieno(3,4-b)(1,4)dioxine-5,7-diyl, 2,3-dihydrothieno(3,4-b)(1,4)dithiine-5,7-diyl, substituted thiophene moiety of formula (a1), substituted furan moiety of formula (a2), substituted 1H-pyrrole moiety of formula (a3), substituted 1,3-thiazole moiety of formula (a4), substituted selenophene moiety of formula (a5), substituted thieno(3,2-b)thiophene moiety of formula (a6), substituted thieno(2,3-b)thiophene moiety of formula (a7), substituted thieno(3,4-b)thiophene moiety of formula (a8), substituted thieno(3,4-b)thiophene-2-carboxylic acid moiety of formula (a9), substituted 4H-thieno(2,3-b)pyrrole moiety of formula (a10), substituted 6H-thieno(3,2-b)pyrrole moiety of formula (a11), substituted 2,2'-bi-1,3-thiazole moiety of formula (a12) or substituted dibenzo(b,d)thiophene moiety of formula (a13);    R3, R3a = H, halo, E1Si-, halo-1-25C alkyl, CN, 1-25C alkyl (optionally interrupted by at least one O or S), 7-25C arylalkyl, 1-25C alkyl (substituted with at least one E1Si- or 1-25C alkoxy);    R4 = H, halo, E1Si-, halo-1-25C alkyl, CN, 1-25C alkyl (optionally interrupted by at least one O or S), 7-25C arylalkyl, 1-25C alkyl (substituted with at least one E-Si-1 or 1-25C alkoxy);    R8 = 6-18C aryl (substituted by 1-18C alkyl, or 1-18C alkoxy) or 1-25C alkyl (optionally interrupted by at least one O or S), 1-25C alkyl (substituted with at least one E1Si-) or 7-25C arylalkyl or H; and    R114 = 1-25C alkyl (optionally interrupted by at least one O, or S.    Provided that at least one of R1, R2, R3, R3a, R4 contains E1Si- and/or D1Si-1.    EXAMPLE - No suitable example given.