TECHNOLOGY FOCUS - ELECTRONICS - Preferred Component: The electronic or electro-optic device comprises first electrode, second electrode spaced apart from first electrode, and layer of active material disposed between first electrode and second electrode.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The bulk heterojunction structure comprises ingredient(s) in addition to conjugated polymer. The ingredient(s) in addition to conjugated polymer is fullerene or its derivatives. The fullerene or its derivatives is (6,6)-phenyl 61C butyric acid methyl ester or (6,6)-phenyl 71C butyric acid methyl ester. Preferred Definitions:    R1, R2=dodecyloxy;and    Ar'=2,3-diphenylquinoxaline-5,8-diyl, 2,1,3- benzothiadiazole-4,7-diyl, thieno(3,4-b)pyrazine-5,7-diyl, 3,4-ethylenedioxythiophene-2,5-diyl, (E)-1,2- vinylenethiophene-2,5-diyl, benzo(c)(1,2,5)selenadiazole-4,7-diyl, 5,5'-(2,2'-(4,7-benzo(c)(1,2,5)thiadiazole-diyl))-bis(3-hexylthiophene)-diyl or thiophene-2,5-diyl.    SPECIFIC COMPOUNDS - 9 Conjugated polymers are specifically claimed, e.g. poly(4,8-didodecyloxy-benzo(1,2-b;3,4-b)dithiophene-2,6-diyl)-Co-(2,3-diphenylquinoxaline-5,8-diyl); poly(4,8-didodecyloxy-benzo(1,2-b;3,4-b)dithiophene-2,6-diyl)-Co-(2,1,3-benzothiadiazole-4,7-diyl); poly(4,8-didodecyloxy-benzo(1,2-b;3,4-b)dithiophene-2,6-diyl)-Co-(thieno(3,4-b)pyrazine-5,7-diyl); poly(4,8-didodecyloxy-benzo(1,2-b;3,4-b)dithiophene-2,6-diyl)-Co-(3,4-ethylenedioxythiophene-2,5-diyl); or poly(4,8-didodecyloxy-benzo( 1,2-b; 3 ,4-b)dithiophene-2,6-diyl)-Co-((E)- 1,2- vinylene).    EXAMPLE - 5,8-Dibromo-2,3-diphenylquinoxaline (0.44 g), 2,6-bis(trimethyltin)-4,8-didodecyloxy-benzo(1,2-b;3,4-b)-dithiophene, and 50 ml toluene were put into two-necked flask with oil bath. The solution was flushed with argon for 10 minutes, and tetrakis(triphenylphosphine)palladium (Pd(PPh3)4) (20 mg) was added into flask. The solution was flushed again for 20 minutes. The oil bath was heated to 110 degrees C carefully, and the reactant was stirred for 16 hours under argon atmosphere. Then, the reactant was cooled to room temperature and polymer was precipitated by addition of methanol (100 ml), and filtered through Soxhlet thimble, which was then subjected to Soxhlet extraction with methanol, hexane, and chloroform. The polymer was recovered as solid sample from chloroform fraction by rotary evaporation, and the solid was dried under vacuum for 1 day.