TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The electron acceptor is one of 41 substituted hetero cyclic compounds e.g. 4,7-dimethyl-benzo(1,2,5)thiadiazole, 4,7-dimethyl-benzo(1,2,5)telluradiazole, 5,6-difluoro-4,7-dimethyl-benzo(1,2,5)thiadiazole, 4,7-dimethyl-benzo(1,2,5)selenadiazole, 4,7-dimethyl-benzo(1,2,5)oxadiazole, 4,7-bis-(5-methyl-thiophen-2-yl)-benzo(1,2,5)thiadiazole, 5,6-difluoro-4,7-bis-(5-methyl-thiophen-2-yl)-benzo(1,2,5)thiadiazole, 4,7-bis-(5-methyl-thiophen-2-yl)-benzo(1,2,5)selenadiazole, 4,7-bis-(5-methyl-thiophen-2-yl)-benzo(1,2,5)telluradiazole, 5,7-dimethyl-2,3-diphenyl-thieno(3,4-b)pyrazine, 4,7-dimethyl-(1,2,5)thiadiazolo(3,4-c)pyridine, 5,8-dimethyl-2,3-diphenyl-quinoxaline, 10,13-dimethyl-dibenzo(a,c)phenazine, 8,11-dimethyl-3a,12b-dihydro-1,6-dithia-7,12-diaza-dicyclopenta(a,c)anthracene, 5,8-dimethyl-4a,8a-dihydro-pyrido(3,4-b)pyrazine, 3,6-dimethyl-(1,2,4,5)tetrazine, 2,5-dimethyl-thiazolo(5,4-d)thiazole, 3,6-dimethyl-(1,2,4,5)tetrazine, 5-methyl-2,7-dithia-1,3,6,8-tetraaza-dicyclopenta(a,f)naphthalene, and substituted 4,9-dimethyl-benzo(lmn)(3,8)phenanthroline-1,3,6,8-tetraone of formula (IIa). EXAMPLE - 4,4,5,5-Tetramethyl-2-(3,3,14,14-tetrakis(4-(octyloxy)phenyl)-17-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-11,22-dithiahexacyclo(10.10.0.0(2,10).0(4,9).0(13,21).0(15,20))docosa-1(12),2(10),4,6,8,13(21),15,17,19-nonaen-6-yl)-1,3,2-dioxaborolane (216.8 mg), 2,1,3-benzothiadiazole (46 mg), tetrakis(triphenylphosphine)palladium(0) (3.6 mg), potassium carbonate (163.3 mg) and N-methyl-N,N,N-trioctylammonium chloride (27 mg) were placed in a 25 ml single-necked flask, and 5 ml of toluene pre-degassed with nitrogen and 1 ml of distilled water were poured into the flask. The mixture was degassed with nitrogen for 10 minutes, and the flask was equipped with a reflux condenser for polymerization at 90 degrees C for 72 hours. Then 400 ml of methanol was used for re-precipitation and the solid was collected by gravity filtration. After the solid was continuously extracting with the acetone for one day, it was continuously extracted with hexane for one day and resolved in the tetrahydrofuran. Then 4 equivalents of silica 1-propanethiol (10.8 mg) and a magnetic stirrer were added for demetallization for 12 hours. After the silica 1-propanethiol was filtered by gravity, the residue was reprecipitated by methanol. After filtration, the polymer as a black green solid was obtained (yield 103 mg).