TECHNOLOGY FOCUS - POLYMERS - Preparation (disclosed): The cyclohexadiene fullerene derivative is prepared by oxidizing 2,5-disubstituted thiophene of formula (II), forming a substituted precursor of formula (III), reacting substituted precursor with a fullerene source by Diels-Alder reaction, and obtaining cyclohexadiene fullerene derivative of formula (IV).Ar'=arylenyl or heteroarylenyl.Preferred Components: The mixture further contains semiconducting compounds having electron donor or p-type properties, preferably p-type organic semiconductor compound, or compounds having semiconducting, charge transport, hole transport, electron transport, hole blocking, electron blocking, electroconductive, photoconductive, or light-emitting property. The p-type organic semiconductor compound is conjugated organic polymer. Preferred Definitions:    Cn=(60C-1h)(5,6)fullerene, (70C-D5h)(5,6)fullerene, (76C-D2asterisk)(5,6)fullerene, (84C-D2asterisk)(5,6)fullerene, (84C-D2d)(5,6)fullerene, La-60C fullerene, La-82C fullerene, Y-82C fullerene, Sc3N-80C fullerene, Y3N-80C fullerene, or Sc3C2-80C fullerene.    EXAMPLE - 1.34 g 2,5-Bis(4-hexylphenyl)thiophene and 3.96 g meta-chloroperoxybenzoic acid were added to a flask. The flask was sealed and purged 3 times with nitrogen and vacuum. Anhydrous dichloromethane was added to the mixture contained in flask using a syringe, and the mixture was reacted at 23 degrees C for 18 hours. The reaction mixture was rotary evaporated and purified by column chromatography using silica and 5-7% ethyl acetate in hexane as eluent, to obtain 2,5-bis(4-hexylphenyl)thiophene-1,1-dione as light yellow waxy solid. 620 cm3 Toluene and 964.5 mg 60C fullerene were added to round bottom flask in an oil bath maintained at 125 degrees C, and stirred and refluxed, to obtain a mixture. 194.8 mg 2,5-Bis(4-hexylphenyl)thiophene-1,1-dione was added to obtained mixture, and the mixture was reacted by stirring for 2 days. The reacted mixture was cooled, and the solvent was removed from mixture under reduced pressure. The crude material was purified by high-pressure liquid chromatography. The fractions containing pure product were combined, and the solvent was removed by rotary evaporation. The resultant product was dried at 70 degrees C under reduced pressure, to obtain bis(4-hexylphenyl)thiophene cyclohexadiene fullerene derivative.