TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: (A) is a benzothiadiazole group, benzooxadizaole group, or benzotriazole group. Preferred Definitions:    Q=optionally substituted thiophene, pyrrole, furan, phenyl, phosphole, benzodithiophene, spirofluorene, spirothiophene, bithiophene, terthiophene, thienothiophene, dithienothiophene, benzothiophene, isobenzothiophene, benzodithiophene, cyclopentadithiophene, silacyclopentadiene, silacyclopentadienebithiophene, indole, benzene, naphthalene, anthracene, perylene, indene, fluorene, pyrene, azulene, pyridine, oxazole, thiazole, thiazine, pyrimidine, pyrazine, imidazole, benzoxazole, benzoxadiazole, benzothiazole, benzimidazole, benzofuran, isobenzofuran, thiadiazole, dithienopyrrole, dithienophosphole or carbazole 9,9-R-R1a-9H-fluorene, 9-R-9H-carbazole, 3,3'-R-R1a-silylene-2,2'-bithiophene, or 3,3'R-R1a-cyclopenta(2,1-b:3,4-b')-dithiophene, preferably a divalent group of formula (e);    R, R1a=1-30C alkyl or 6-30C aryl; and    B1=optionally substituted thiophene, pyrrole, furan, phenyl, phosphole, benzodithiophene, spirofluorene, spirothiophene, bithiophene, terthiophene, thienothiophene, dithienothiophene, benzothiophene, isobenzothiophene, benzodithiophene, cyclopentadithiophene, silacyclopentadiene, silacyclopentadienebithiophene, indole, benzene, naphthalene, anthracene, perylene, indene, fluorene, pyrene, azulene, pyridine, oxazole, thiazole, thiazine, pyrimidine, pyrazine, imidazole, benzoxazole, benzoxadiazole, benzothiazole, benzimidazole, benzofuran, isobenzofuran, thiadiazole, perfluorylbenzene, or carbazole, where the sum of n and m is 1.    SPECIFIC COMPOUNDS - 1 Compound (B) is specifically claimed i.e. 7,7'-(4,4-bis(2-ethylhexyl)-4H-silolo(3,2-b:4,5-b')dithiophene-2,6-diyl)bis(5,6-difluoro-4-(5'-hexyl-(2,2'-bithiophene)-5-yl)benzo(c)(1,2,5)thiadiazole) of formula (BB).    EXAMPLE - In a two-necked round bottom flask (250 l), 7,7'-(4,4-bis(2-ethylhexyl)-4H-silolo(3,2-b:4,5-b')dithiophene-2,6-diyl)bis(5,6-difluoro-4-iodobenzo(c)(1,2,5)thiadiazole) (1.5 g) and 5'-hexyl-2,2'-bithiophene-5-boronic acid pinacol ester (773 mg) were dissolved in anhydrous toluene (60 ml), and degassed for 15 minutes. Tris(dibenzylideneacetone)dipalladium(0) (140 mg) and tri-tert-butylphosphonium tetrafluoroborate (180 mg) were added to the mixture and the mixture was degassed for another 2 minutes. Finally, degassed 2M potassium carbonate (20 ml) was added and the mixture was heated to 110 degrees C for 16 hours under nitrogen. Upon cooling the reaction mixture was poured into methanol (300 ml) and stirred for 30 minutes. The precipitate that formed was collect by filtration and washed with copious amounts of methanol and distilled water. The crude product was first purified by flash chromatography using with methylene chloride as eluent. After fraction collection and solvent removal a maroon solid was obtained. The product was then further purified by soxhlet extraction with methanol and acetone to removed monomers and catalyst residues. The remaining solid in the thimble was stirred in diethyl ether (50 ml) for 30 minutes, filtered and then dried under vacuum for 24 hours to give 7,7'-(4,4-bis(2-ethylhexyl)-4H-silolo(3,2-b:4,5-b')dithiophene-2,6-diyl)bis(5,6-difluoro-4-(5'-hexyl-(2,2'-bithiophene)-5-yl)benzo(c)(1,2,5)thiadiazole).