TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The semiconductor device contains (I) and/or oligomer or polymer, as a layer, having a thickness of 5-1000 nm, on a rigid or flexible solid substrate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The intermediate obtained in step (a) or (b) is reacted in step (c) with a piperazine-2,3-dione compound of formula (g1) to obtain a benzo(2,1-b;3,4-b')dithiophene-4,5-dione compound of formula (g2), which is optionally further modified in step (d).R = H, 1-18C (halo)alkyl, 5-10C aryl or 3-12C cycloalkyl.    TECHNOLOGY FOCUS - POLYMERS - Preferred Process: The polymer is obtained by homopolymerization of a halogen substituted 2,2'-dithiophene compound of formula (III), or by copolymerization of (III) with a suitable further monomer, especially comprising dihalogenated or diboronated mono- or oligothiophenes compounds of formula (IV) or benzothiadiazoles compounds of formula (V).T = halo, preferably Br;R1p = residue of boronic acid or its ester, or halo, preferably Br; andq = 1-6. Full Definitions:    R1, R11 = H or substituent, halo or Si(R6a)(R4a)-R5a (when n is not 0);    R2, R22 = 1-25C alkyl, 3-12C cycloalkyl, 2-25C alkenyl, 2-25C alkynyl, 4-25C aryl, 5-25C alkylaryl or 5-25C arakyl (all optionally substituted), (where R2 and/or R22 is halo, and in case that R3a and R3b, or R7a and R7b, together are the bridging group (-C(=O)-C(=O)-), R2 and R22 is H);    R6a, R6b = 1-25C alkyl, 3-12C cycloalkyl, 4-25C aryl or 5-25C aralkyl; either    R3a, R3b = R7a or R7b; or    R3a+R3b = -C(=N-R9)-C(=N-R99)-; either    R7a, R7b = 1-25C alkyl, 2-25C alkenyl, 2-25C alkynyl, 1-25C acyl, 2-25C alkoxycarbonyl, 1-25C acyloxy, 3-12C cycloalkyl, 4-25C aryl, 5-25C alkylaryl, or 5-25C aralkyl (all optionally substituted); or    R7a+R7b = -C(=O)-, -C(=N-R11a)-, -C(=O)-C(=O)-, -C(=C(R12)(R13))-, -C(R12)(R13)-, -M(R4a)(R5a)-, -B(R10)-, -P(R10)-, -C(=O)-O-C(=O)-, -C(=O)-N(R8)-C(=O)- or -C(=O)-S-C(=O)-;    M = Si or Ge;    Y2 = a phenyl group of formula (a1), a thiophene group of formula (a2), an ethylene group of formula (a3) or (a4), or -C?=C-;    R8, R88 = H or substituent;    R9+R99 = (a4), or a substituted phenyl group of formula (a5);    R10 = 1-25C alkyl, 3-12C cycloalkyl, 4-25C aryl, 5-25C alkylaryl or 5-25C arakyl (all optionally substituted);    R11a = R8 or OR8; either    one of R12, R13 = H; and    the other or both R12, R13 = substituents; or    R12+R13 = 2-25C divalent hydrocarbon residue (optionally substituted and/or interrupted); either    R14 = substituent; or    2, or 3 neighboring residues of R14 = 4-25C divalent or trivalent hydrocarbon residue (optionally substituted and/or interrupted);    R2g, R3g = 1-25C (halo)alkyl, 5-10C aryl, 3-12C cycloalkyl, preferably 1-6C alkyl, phenyl, cyclopentyl, or cyclohexyl;    R1g = H, 1-25C (halo)alkyl, 5-10C aryl, 3-12C cycloalkyl, preferably 1-6C alkyl, phenyl, cyclopentyl, or cyclohexyl;    p = 0-6; and    m = 0-4.    Provided that: any substituent, if present, is halo, 1-25C alkyl, 2-25C alkenyl, 1-25C alkylthio, 1-25C acyl, 4-10C aryl, 1-9C heteroaryl, 3-12C cycloalkyl, 2-11C heterocycloalkyl, 1-25C acyloxy, or residues of COR1g, CH=NR1g, CH=N-OH, CH=NOR1g, COOR1g, CONHR1g, CONR1gR2g, CONH-NHR1g, CONH-NR1gR2g, SO2R1g, SO3R1g, SO2NHR1g, SO2NR1gR2g, SO2NH-NHR1g, SO2NH-NR1gR2g, S(O)R1g, S(O)OR1g, S(O)NHR1g, S(O)NR1gR2g, S(O)NH-NHR1g, S(O)NH-NR1gR2g, SiR1gR2gR3g, POR1gR2g, PO(OR1g)R2g, PO(OR1g)2, PO(NHR1g)2, PO(NR1gR2g)2, CN, NO2, NHR1g, NR1gR2g, NH-NHR1g, NH-NR1gR2g, or CONR1gOH; and if R7a and R7b together are -CO-, at least one of R2a and R2b contains at least 2C, especially 4C or more.    EXAMPLE - 3,5,3',5'-Tetrabromo-4,4'-didodecyl-(2,2')bithiophenyl (10 g) was dissolved in dry tetrahydrofuran (150 ml) and heptane (70 ml) under nitrogen atmosphere and the solution was cooled to -20 degrees C. After adding of 2.7 M solution of butyl lithium (9.5 ml) in heptane, the obtained solution was stirred at -20 degrees C for 1 hour, trimethylsilyl chloride (3 ml) was added, the resulting mixture was stirred at -20 degrees C for 15 minutes and then allowed to warm to room temperature. After stirring for an additional hour, water (50 ml) was added and worked up to give 3,3'-dibromo-4,4'-didodecyl-5,5'-bis-trimethylsilanyl-(2,2')bithiophenyl. 3,3'-Dibromo-4,4'-didodecyl-5,5'-bis-trimethylsilanyl-(2,2')bithiophenyl was dissolved in dry tetrahydrofuran (500 ml) under nitrogen atmosphere and the solution was cooled to -60 degrees C. 2.7 M solution of butyl lithium in heptane was added at once and the mixture was allowed to warm to -30 degrees C, followed by addition of dimethylcarbamyl chloride (11.5 ml). After stirring at -20 degrees C for 15 minutes the mixture was allowed to warm to 0 degrees C and water (100 ml) was added. The organic phase was separated and washed with brine. N-bromosuccinimide (37.4 g) was added at 0 degrees C, the mixture was stirred at 0 degrees C for 30 minutes and at room temperature for an additional hour and worked up to give 2,6-dibromo-3,5-didodecyl-cyclopenta(2,1-b;3,4-b')dithiophen-4-one. Tetrakistriphenylphosphino palladium (0.94 g) was added to a degassed solution of 2,6-dibromo-3,5-didodecyl-cyclopenta(2,1-b;3,4-b')dithiophen-4-one (11.13 g) and tributyl-thiophen-2-yl-stannane (15.1 g) in toluene (100 ml) and the mixture was heated under reflux for 16 hours, cooled to room temperature and filtered through silica gel to give 3,5-didodecyl-2,6-di(thien-2-yl)-cyclopenta(2,1-b;3,4-b')dithiophen-4-one (95%).