TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): The preparation of (I), comprises performing copolymerization reaction on furo(2,3-f)(1)benzofuran compound of formula (IV) and an aromatic compound of formula (Y1-Ar-Y1) (V) under action of a catalyst. Preferred Components: (I) has molecular weight of 1000-1000000, preferably 3000-500000, more preferably 20000-200000. The doping agent is fullerene or its derivatives, preferably (6,6)-phenyl-C61-methyl butyrate or (6,6)-phenyl-C71-methyl butyrate or indene-containing fullerene. (I) is 2-thien-2-yl-furo(2,3-f)(1)benzofuran polymer of formula (III).Either Y1 = boric acid, boric acid ester, halogenated zinc, halogenated magnesium or trialkyltin; andX = I, Br or Cl; orX = boric acid, boric acid ester, halogenated zinc, halogenated magnesium or trialkyltin; andY1 = I, Br or Cl, Where the boric acid group is preferably 1,3,2-dioxa-boran-2-yl, 4,4,5,5-tetramethyl-1,2,3-dioxapentaboran-2-yl or 5,5-dimethyl-1,3,2-dioxaboran-2-yl;halogenated magnesium = magnesium chloride, magnesium bromide or magnesium iodide;halogenated zinc = preferably zinc chloride or zinc bromide;trialkyl tin = trimethyl tin, triethyl tin or tributyl tin;R1a, R2b,R3-R6 = 1-30C alkyl or 1-30C alkoxy;Ar1 = heteroarylene containing N, preferably benzo(c)(1,2,5)thiadiazol-4,7-di-yl, quinoxalin-5,8-di-yl, 1,2,4,5-tetrazin-3,6-di-yl, thieno(3,4-d)thiazol-4,6-di-yl or thieno(3,4-b)pyrazin-5,7-di-yl, 2H-benzo(d)(1,2,3)triazole group of formula (VI), pyrrolo(3,4-c)pyrrole-1,4(2H,5H)-dione group of formula (VII) or 3,3'-biindoline-2,2'-dione group of formula (VIII);R = H, 1-20C alkyl or 1-20C alkoxy; andR1a, R2b = 4-12C alkyl. Preferred Definitions:    A1, A2 = H;    R1, R2 = 4-20C alkyl or 4-20C alkoxy; and    Ar = 2,3-dihydrothieno(3,4-b)(1,4)dioxin-5,7-di-yl, 4,5,6,7-tetrahydrobenzo(c)(1,2,5)thiadiazol-4,7-di-yl, naphtho(2,3-c)(1,2,5)thiadiazol-4,9-di-yl, (1,2,5)thiadiazolo(3,4-g)quinoxalin-4,9-di-yl, (1,2,5)thiadiazolo(3,4-c)pyridin-4,7-di-yl, 5,6-difluoro-benzo(c)(1,2,5)thiadiazol-4,7-di-yl, benzo(c)(1,2,5)oxadiazol-4,7-di-yl, 3,4-dinitrothiophen-2,5-di-yl, quinoxalin-5,8-di-yl, pyrazino(2,3-g)quinoxalin-5,10-di-yl, 2,3-diphenylquinoxalin-5,8-di-yl, 2,3-diphenylpyrido(3,4-b)pyrazin-5,8-di-yl, benzo(c)thiophen-1,3-di-yl, thieno(3,4-b)thiophen-4,6-di-yl, thiazol-2,5-di-yl, pyrazin-2,5-di-yl, 1,2,4,5-tetrazin-3,6-di-yl, pyrido(3,4-d)pyridazin-5,8-di-yl, thieno(3,4-b)pyridin-5,7-di-yl, thieno(3,4-b)pyrazin-5,7-di-yl, pyrazino(2,3-b)thieno(3,4-e)pyrazin-6,8-di-yl or 2,3-diphenylthieno(3,4-b)pyrazin-5,7-di-yl.