NOVELTY - Rigid oligomer fullerene copolymer, is claimed.    USE - The rigid oligomer fullerene copolymer is useful as photo-electric material for organic field effect transistor, organic solar cell and organic photo conductor and for making model for charge separation and electronic transmission (all claimed).    ADVANTAGE - The rigid oligomer fullerene copolymer has high solubility.    DETAILED DESCRIPTION - Rigid oligomer fullerene copolymer of formula (I), is claimed.    F = fullerene;    x, z = 0-20;    y = 1-10;    Ar1, Ar3 = benzothiadiazolyl (substituted by alkyl or alkoxy), phenyl, fluorenyl, thienyl, thieno (2,1-b:3,4-b'), cyclopentyl, di(3,2-b:2,3-d)thiophenyl, thieno (2,3-b) thiophene, thiophene benzo(3,4-d)thiophenyl, 4H-(2,1-b:3,4-b')thienyl, azlocillin (1,2-b:4,5-b') di thiophene, benzo (1,2-b:4,5-b') di thiophene group, silicon heterocycle pentadiene (3,2-b:4,5-b') thienyl, thieno (3,2-b:2',3'-d) pyrrolyl, anthryl, triphenylamine, phenazine, pyrrolyl, thiazolyl, pyridyl, quinolinyl, furanyl, biphenyl, carbazolyl or indolyl, where the alkyl is methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, 2-methyl butyl, 3-methyl butyl, 1-ethyl butyl, 2-ethyl butyl, 1-butyl, methyl cyclopentane, 2-methyl cyclopentane, 3-methyl cyclopentane, 2-ethylpentyl, 3-ethylpentyl, hexyl, isohexyl, 2-methyl ethyl, 3-methyl ethyl, 4-methyl ethyl, 5-methyl ethyl, 2-ethyl hexyl, heptyl, heptyl, octyl, isooctyl, nonyl, decyl or 1-dodecyl ester; and    Ar2 = fluorenyl or cyclopentyl (2,1-b:3',4'-d).    An INDEPENDENT CLAIM is included for preparing (I) comprising (1) adding rigid oligomer according to a mole ratio and 1-2% of toluenesulfonic acid in a solvent, adding a small amount of acid catalyst and then performing oligomerization at 60-120 degrees C for 7-24 hours, and evaporating the solvent and then washing to obtain hydrazone oligomer and (2) adding obtained oligomer hydrazone with methanol and sodium under the protection of inert gas at room temperature and then stirring for 15-60 minutes, adding water into 0.5-2% of the solution and then reacting at 70-120 degrees C for 6-48 hours, and separating and purifying to obtain primary product and then refluxing with o-dichlorobenzene solution for 6-18 hours to obtain rigid oligomer fullerene.