TECHNOLOGY FOCUS - ELECTRONICS - Preferred Device: The semiconductor device comprises as a semiconducting effective unit, the compound (I) with the provision that at least one of R6, R7, R27, R28 and R58 is different from H.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Disclosed): 2 Methods for the preparation of (I) are given e.g. reacting in the presence of strong base, 1 mole of disuccinate such as dimethyl succinate with 1 mole of nitrile of formula H-Ar1-CN, H-Ar4-CN, H-Ar2-CN and H-Ar5-CN to form a compound of formula (IV); N-alkylating the compound (IV) by reacting with a bromide of formula R1-Br and R2-Br in the presence of base such as potassium carbonate in a solvent such as N-methyl-pyrrolidone to form a compound of formula (V); reacting the compound (V) with a brominating agent such as N-bromo-succinimide to form corresponding brominated derivatives (VI); and reacting the compound (VI) with Sn(Bu)3-(Ar6)f-R4 and Sn(Bu)3-(Ar3)c-R3 to form (I). Preferred Definitions:    a and d=0;    b, c, e and f=1;    Ar2, Ar3, Ar5, and Ar6=bivalent group (ib);    R6 and R7=H or 1-2C alkyl;    R3 and R4=groups of formulae (iia), (iib), (iic), (iie), (iif) or (iij).    SPECIFIC COMPOUNDS - 33 Compounds are specifically claimed as the compound (I) e.g. 3,6-bis-(3,3''-bis-(2-ethyl-hexyl)-(2,2';5',2'')terthiophen-5-yl)-2,5-dimethyl-2,5-dihydro-pyrrolo(3,4-c)pyrrole-1,4-dione of formula (I'), 3,6-bis-(3,3''-dihexyl-(2,2';5',2'')terthiophen-5-yl)-2,5-dimethyl-2,5-dihydro-pyrrolo(3,4-c)pyrrole-1,4-dione, 3,6-bis-(3,3''-dihexyl-(2,2';5',2'')terthiophen-5-yl)-2,5-bis-(3-phenyl-propyl)-2,5-dihydro-pyrrolo(3,4-c)pyrrole-1,4-dione, 3,6-bis-(3,3''-dihexyl-(2,2';5',2'')terthiophen-5-yl)-2,5-bis-(2-ethyl-hexyl)-2,5-dihydro-pyrrolo(3,4-c)pyrrole-1,4-dione, 2,5-bis-(2-ethyl-hexyl)-3,6-bis-(2,2';5',2'')terthiophen-5-yl-2,5-dihydro-pyrrolo(3,4-c)pyrrole-1,4-dione and 8 compounds are specified as the semiconducting effective units, e.g. 3,6-bis-(4'-(3,7-dimethyl-octyl)-(2,2')bithiophenyl-5-yl)-2,5-bis-(2-ethyl-hexyl)-2,5-dihydro-pyrrolo(3,4-c)pyrrole-1,4-dione and 2,5-bis-(2-butyl-hexyl)-3,6-bis-(4'-(3,7-dimethyl-octyl)-(2,2')bithiophenyl-5-yl)-2,5-dihydro-pyrrolo(3,4-c)pyrrole-1,4-dione.    EXAMPLE - To a mixture of 0.25 g of 3,6-bis-(3,3''-bis-(2-ethyl-hexyl)-(2,2';5',2'')terthiophen-5-yl)-2,5-dihydro-pyrrolo(3,4-c)pyrrole-1,4-dione in 10 ml of N-methyl-pyrrolidone (NMP) were added at 5 degrees C, 28 mg of sodium hydride. The mixture was allowed to warm to room temperature and was stirred for 2 hours at this temperature. After cooling to 5 degrees C, 100 mg of methyl iodide was added. The stirring was continued for 3 hours at room temperature before water was slowly added. The mixture was then poured into dichloromethane, washed with water and concentrated to 1 ml before methanol was added. After work up, 3,6-bis-(3,3''-bis-(2-ethyl-hexyl)-(2,2';5',2'')terthiophen-5-yl)-2,5-dimethyl-2,5-dihydro-pyrrolo(3,4-c)pyrrole-1,4-dione (180 mg) was obtained as dark blue powder.