TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: The electron acceptor is fullerene, carbon nanotubes or their derivatives, 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline, semiconductor elements and/or semiconductor compounds, preferably 60 carbon fullerene derivatives or a 70 carbon fullerene derivatives. Preferred Method: The copolymer and the electron acceptor are mixed at a weight ratio of 1:0.5-1:4.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The organic material layers comprise at least one electron donor material or an electron acceptor material, where the electron donor is the copolymer. The first unit is present at greater than 0 mole% to less than or equal to 45 mole%. The copolymer comprises substituted compounds of formula (((-A1-B1)l-(C1-D1-)m)n-) (IV). The copolymer is substituted fused cyclic compounds of formula (V). The copolymer further comprises a fourth unit that is substituted 3-(5-(7-thiophen-2-yl-benzo(1,2,5)thiadiazol-4-yl)-thiophen-2-yl)-9H-carbazole compounds of formula (VI) and fifth unit that is substituted 4-(5-(9H-fluoren-3-yl)-thiophen-2-yl)-7-thiophen-2-yl-benzo(1,2,5)thiadiazole compounds of formula (VII). The copolymer has an aryl or heterocyclyl as its end group, number-average molecular weight of 500-1000000 g/mole and a molecular weight distribution of 1-100.l = greater than 0 to less than or equal to 1;m = greater than or equal to 0 to less than 1;l+m = 1;n = 1-10000;A1 = (I); andB1, C1, D1 = (II) or (III). EXAMPLE - N-9'-Heptadecanyl-3,6-dibromocarbazole (4 g) was dissolved in tetrahydrofuran (30 ml) and cooled to -78 degrees C, and n-butyllithium (1.7 M) in hexane (17.5 ml) was added to it. The resulting mixture was stirred for 1 hour, and 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (5.28 g) was added. The resulting mixture was warmed and stirred for 12 hours. Water was added to the mixture and the mixture was extracted and washed. The resulting solution was dried and worked up to give 3,6-bis(4',4',5',5'-tetramethyl-1',3',2'-dioxaborolan-2'-yl)-N-9'-heptadecanylcarbazole (e1). 2,7-Bis(4',4',5',5'-tetramethyl-1',3',2'-dioxaborolan-2'-yl)-9,9-dioctylfluorene (197 mg), (e1) (4.1 mg), 4,7-bis-(5-bromo-2-thienyl)-2,1,3-benzothiadiazole (143 mg), tetraethylammonium hydroxide (3 ml), tetrakis(triphenylphosphine)palladium(0) (5 mg), Aliquat 336 (RTM: Quaternary ammonium salt) were added to toluene (3 ml) and stirred. After 72 hours, phenylboronic acid (0.05 g) was added and reacted for 3 hours and bromo benzene (0.12 g) was added and reacted for 4 hours. The resulting mixture was cooled and poured into methanol. The resulting solid was filtered and worked up to give a copolymer.