TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The device (A) is a thin film transistor comprising: a substrate; a gate electrode; a gate dielectric component; a source electrode; a drain electrode; and the semiconducting component comprising the thin film semiconductor, where the semiconducting component is in contact with the source electrode, the drain electrode, and the gate dielectric component. The device (B) is a photovoltaic cell comprising: a substrate; an anode; a cathode; and the photoactive component comprising the thin film semiconductor, where the photoactive component is disposed between the anode and the cathode. The device (B) is a light emitting transistor comprising: a substrate; a gate electrode; a gate dielectric component; a source electrode; a drain electrode; and the photoactive component comprising the thin film semiconductor, where the photoactive component is in contact with the source electrode, the drain electrode, and the gate dielectric component, a photoactive component comprising at least one (I).    TECHNOLOGY FOCUS - POLYMERS - Preparation: No preparation method is given. Preferred Components: The oligomeric or polymeric compound (I) comprises an optionally substituted pyrrolo(3,2-b)pyrrole-2,5(1H,4H)-dione-3,6-diyl moiety of formula (M1). The oligomeric or polymeric compound (I) is of formula (-((M1)x-(M2)y)-).R1, R2 = 1-40C (halo)alkyl, 2-40C alkenyl (both optionally substituted with 1-10 halo, -CN, NO2, OH, -NH2, -NH(1-20C alkyl), -N(1-20C alkyl)2, -S(O)2OH, -CHO, -C(O)-(1-20C)alkyl, -C(O)OH, -C(O)-O(1-20C)alkyl, -C(O)NH2, - C(O)NH-(1-20C)alkyl, -C(O)N(1-20C alkyl)2, -O-(1-20C)alkyl, -SiH3, - SiH(1-20C alkyl)2, -SiH2(1-20C alkyl), or -Si(1-20C alkyl)3, and optionally covalently bonded to the imide N via an optional linker), H, or 1-4 cyclic moieties (optionally covalently bonded to each other or the imide N via an optional linker, and optionally substituted with 1-5 halo, oxo, -CN, NO2, OH, =C(CN)2, -NH2, -NH(1-20C alkyl), -N(1-20C alkyl)2, -S(O)2OH, -CHO, -C(O)OH, -C(O)-(1-20C)alkyl, -C(O)-O(1-20C alkyl), -C(O)NH2, -C(O)NH-(1-20C)alkyl, -C(O)N(1-20C alkyl)2, -SiH3, -SiH(1-20C alkyl)2, - SiH2(1-20C alkyl), -Si(1-20C alkyl)3, -O-(1-20C)alkyl, -O-(1-20C)alkenyl, -O-(1-20C)haloalkyl, 1-20C alkyl, 1-20C alkenyl, or 1-20C haloalkyl);V1 = covalent bond, -(Ar1)t-, -((Ar1)m1-Z)t-, -Z-, or -((Ar1)m1-Z-(Ar1)m1)t-;Ar1 = 6-14C aryl or 5-14 membered heteroaryl group (both optionally substituted with 1 or 2 halo, CN, oxo, =C(CN)2, 1-40C (halo)alkyl, 1-40C alkoxy, or 1-40C alkylthio), preferably 1,4-phenylene, substituted thiophene-2,5-diyl moiety of formula (a1), substituted thieno(3,2-b)thiophene-2,5-diyl moiety of formula (a2), substituted thieno(2,3-b)thiophene-2,5-diyl moiety of formula (a3), substituted naphthalene-2,6-diyl moiety of formula (a4), substituted benzo(b)thiophene-2,6-diyl moiety of formula (a5), substituted benzo(b)thiophene-2,5-diyl moiety of formula (a6), substituted benzothiazole-2,6-diyl moiety of formula (a7), substituted 1H-pyrrole-2,5-diyl moiety of formula (a8), substituted furan-2,5-diyl moiety of formula (a9), (1,3,4)thiadiazole-2,5-diyl, or (1,3,4)oxadiazole-2,5-diyl;R4 = H, halo, CN, oxo, =C(CN)2, 1-40C (halo)alkyl, 1-40C alkoxy, or 1-40C alkylthio;Z = linear conjugated linker (preferably );m1 = 1-4;t = 1-20;M1 = pyrrolo(3,2-b)pyrrole-2,5(1H,4H)-dione-3,6-diyl moiety (M1) (optionally substituted);M2 = conjugated moiety (optionally substituted) other than M1, preferably thiophene-2,5-diyl, 2,2'-bithiophene-5,5'-diyl, 3,3'-didodecyl-2,2'-bithiophene-5,5'-diyl, 3,3'-didodecyl-4,4'-difluoro-2,2'-bithiophene-5,5'-diyl, 3,3'-bis(perfluorohexyl)-2,2'-bithiophene-5,5'-diyl, 3,3'-bis(perfluorohexyloxy)-2,2'-bithiophene-5,5'-diyl, 3,3'-bis(perfluorohexyloxy)-4,4'-difluoro-2,2'-bithiophene-5,5'-diyl, 3,3'-bis(dodecyloxy)-2,2'-bithiophene-5,5'-diyl, 3,3'-bis(dodecyloxy)-4,4'-difluoro-2,2'-bithiophene-5,5'-diyl, 3,3'-bis(perfluorohexylthio)-2,2'-bithiophene-5,5'-diyl, 3,3'-bis(perfluorohexylthio)-4,4'-difluoro-2,2'-bithiophene-5,5'-diyl, 3,3'-bis(dodecylthio)-2,2'-bithiophene-5,5'-diyl, 3,3'-bis(dodecylthio)-4,4'-difluoro-2,2'-bithiophene-5,5'-diyl, 3,3'-bis(dodecylthio)-2,2'-bifuran-5,5'-diyl, 3,3'-bis(dodecylthio)-4,4'-difluoro-2,2'-bifuran-5,5'-diyl, 4,4'-bis(dodecyloxy)-5,5'-bithiazole-2,2'-diyl, 4,4'-bis(dodecylthio)-5,5'-bithiazole-2,2'-diyl, thieno(3,2-b)thiophene-2,5-diyl, dithieno(3,2-b;2',3'-d)thiophene-2,6-diyl, 4,4-dioctyl-4H-cyclopenta(2,1-b;3,4-b')dithiophene-2,6-diyl, (E)-5,5'-(1,2-diethoxyethene-1,2-diyl)bis(thiophene-5,2-diyl), (E)-4,4'-(1,2-diethoxyethene-1,2-diyl)bis(4,1-phenylene), or 3,3'-bis(2-ethylhexyl)-2,2'-bithiophene-5,5'-diyl; andx, y = 0-1 where x+y is 1. EXAMPLE - To a 10 ml microwave tube, 2,6-bis(trimethylstannyl)-4,8-didodecylbenzo(1,2-b:4,5-b')dithiophene (51.2 mg), 3,6-bis-(5-bromo-thiophen-2-yl)-1,4-bis-(2-butyloctyl)-1,4-dihydropyrrolo(3,2-b)pyrrole-2,5-dione (47.7 mg), tris(dibenzylideneacetone)dipalladium(0) (2.7 mg) and tri(o-tolyl)phosphine (3.7 mg) were mixed in anhydrous toluene (5 ml) under argon. Then the tube was heated to 180 degrees C in 30 minutes and kept at this temperature for 270 minutes by a CEM discover microwave reactor. After cooling, the reaction mixture was poured into methanol (50 ml), filtered and dried in a vacuum oven to give a dark brown solid (68.4 mg). Using a Soxhlet setup, the crude product was extracted successively, with methanol, hexane, ethyl acetate, tetrahydrofuran and chloroform. The chloroform extract was poured into methanol (100 ml) and the solid was collected to give poly((2,6-(4,8-didodecylbenzo(1,2-b:4,5-b')dithiophene))-alt-(5,5-(1,4-bis(2-butyloctyl)-3,6-dithiophen-2-yl-1,4 -dihydropyrrolo(3,2-b) pyrrole-2,5-dione))) (62.1 mg, 89%).