TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: The transistor includes a gate electrode (14) positioned on a substrate (12), a source electrode and a drain electrode facing each other and defining a channel region, an insulation layer (16) separating the source electrode and the drain electrode, and the gate electrode and an active layer (18) including the organic semiconductor compound in the channel region between the source and drain electrodes.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Disclosed): Preparation of (I) comprises reacting substituted thiophene compounds of formula (III) with substituted fused cyclic compounds of formula (IV) in the presence of (A5-Z-A6), palladium catalyst (e.g. tetrakis(triphenylphosphine)palladium) or nickel catalyst (e.g. 1,3-bis(diphenylphosphino)propane nickel(II) dichloride) to give (I).A1-A6 = halo, trialkyltin moiety of formula (-Sn(R31)(R32)(R33)), borolane moiety of formula (-B(OH)2) or borolane moiety of formula (V); andR31-R37 = H or 1-7C alkylProvided that at least one of R31-R33, R34-R37 is alkyl. Preferred Components: (I) comprises a substituted poly(thiophene)-poly(nitrogen containing-fused ring) compounds of formula (II).Z1 = at least one functional group comprising thieno(3,2-b)thiophen-diyl, 1H-2lambdaasterisk4asterisk-thieno(3,4-c)thiophen-diyl, substituted tricyclic moiety of formula (a) or (b), 1,4,6,9-tetrahydro-5,10-dithia-indeno(2,1-a)inden-diyl, benzo(1,2-b;4,5-b')dithiophen-diyl,substituted pentacyclic moiety of formula (c) or (d), benzen-diyl, naphthalen-diyl, thiophen-diyl, (2,2')bithiophen-diyl or pyrimido(5,4-d)pyrimidin-diyl moiety of formula (e), where Z1 is different from Z; andr/(p+q+r) = less than 0.2.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The number average molecular weight (Mn) of (I) is 5000-200000. The weight average molecular weight (Mw) of (I) is 10000-500000. (I) is p-type. Preferred Definitions:    R2 = H;    p/(p+q) = 0.6-0.9;    N, Y1 and X containing fused ring = thieno(3,4-b)pyrazine-5,7-diyl, furo(3,4-b)pyrazine-5,7-diyl, selenopheno(3,4-b)pyrazine-5,7-diyl, pyrido(3,4-b)pyrazine-5,8-diyl, (1,2,5)thiadiazolo(3,4-c)pyridine-4,7-diyl, (1,2,5)oxadiazolo(3,4-c)pyridine-4,7-diyl, benzo(c)(1,2,5)thiadiazole-4,7-diyl, benzo(c)(1,2,5)oxadiazole-4,7-diyl, benzo(c)(1,2,5)selenadiazole-4,7-diyl, pyrazino(2,3-d)pyridazine-5,8-diyl, pyrazino(2,3-g)quinoxaline-5,10-diyl or (1,2,5)thiadiazolo(3,4-g)quinoxaline-4,9-diyl (all optionally substituted with 1-15C alkyl (linear or branched), 3-15C cycloalkyl, 1-15C alkoxy, 6-15C aryl and/or 2-15C heteroaryl (all optionally substituted));    Z = thieno(3,2-b)thiophen-diyl, 1H-2lambdaasterisk4asterisk-thieno(3,4-c)thiophen-diyl, substituted tricyclic moiety (a) or (b), 1,4,6,9-tetrahydro-5,10-dithia-indeno(2,1-a)inden-diyl, benzo(1,2-b;4,5-b')dithiophen-diyl,substituted pentacyclic moiety (c) or (d), benzen-diyl, naphthalen-diyl, thiophen-diyl, (2,2')bithiophen-diyl or pyrimido(5,4-d)pyrimidin-diyl moiety (e);    Q1, Q2 = S, CR64R65, NR66 or SiR67R68; and    R60-R68 = 1-15C alkyl (linear or branched), 3-15C cycloalkyl, 1-15C alkoxy, 6-15C aryl, 2-15C heteroaryl (all optionally substituted with a substituent comprising 1-15C alkyl (linear or branched), 3-15C cycloalkyl, 1-15C alkoxy, 6-15C aryl and/or 2-15C heteroaryl) and/or H.    EXAMPLE - 2,3-Di(3-dodecyloxyphenyl)-5,8-dibromopyrido(3,4-b)pyrazine (15 g) and 2-bromo-3-hexyl-5-trimethylstannylthiophene (0.33 g) were added to anhydrous dimethyl formamide under a nitrogen atmosphere. While the mixture was lightly heated, 2,5-bis(trimethylstannyl)bithiophene (0.08 g) was added. After the reaction mixture was completely dissolved, tetrakis(triphenylphosphine)palladium (0.1 g) as a polymerization catalyst was added. The resulting mixture was reacted at 90 degrees C for 12 hours. The reaction solution was cooled down and then, filtered to obtain a polymer solid. The polymer solid was rinsed with a hydrochloric acid aqueous solution/chloroform twice, an ammonia aqueous solution/chloroform twice and water/chloroform twice in order and then, recovered by suing methanol, acetone, methylenechloride and chloroform in Soxhlet extraction method. The polymer was dried to obtain red polymer (poly((3-hexyl-thiophene)p-(5-(2,2')bithiophenyl-5-yl-2,3-bis-(3-dodecyloxy-phenyl)-pyrido(3,4-b)pyrazine)q) (where p/(p+q) = 0.8)) (45%, number average molecular weight of 28000).