NOVELTY - An alkylene fluorene containing thiophene-pyrrole-dione derivative (I) is new.    USE - Alkylene fluorene containing thiophene-pyrrole-dione derivative used as organic polymer semiconductor material for solar cell device (claimed).    ADVANTAGE - The organic polymeric material improves order and regularity of molecular chains within the material and arranged between segments, improves mobility of carriers in solar cell device, and increases photoelectric conversion efficiency.    DETAILED DESCRIPTION - An alkylene fluorene containing thiophene-pyrrole-dione derivative of formula (I) is new.    n=10-100; and    R1-R2=H or 4-40C alkyl.    INDEPENDENT CLAIMS are included for:    (1) preparation of compound (I);    (2) preparation of compound (II) comprising injecting fluorene derivative of formula (IV) to tetrahydrofuran solvent under anhydrous anaerobic reaction at - 70-- 85 degrees C, slowly adding n-butyllithium, stirring for 0.5-4 hours, where molar ratio of compound (IV) to n-butyllithium is 1:2-4, slowly adding 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-oxa-amyl borane or bis-pinacol diboron compound at - 70-- 85 degrees C, warming to room temperature, reacting for 10-48 hours, and separating and purifying, where molar ratio of n-butyllithium to 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-oxa-amyl borane is 1:1-2;    (3) preparation of compound (IV) comprising dissolving fluorene derivative of formula (V) in tetrahydrofuran solvent under nitrogen atmosphere and at - 5 degrees C, stirring, adding 1 mol/l alkyl magnesium bromide solution in diethyl ether, reacting at 0 degrees C for 35 minutes, where ratio of compound (V) to alkyl magnesium bromide solution is 1:2-2.4, adding 0.1 mol/l copper tetrachloride lithium diethyl tetrahydrofuran solution, reacting for 4-8 hours, adding 10% sodium hydroxide solution, reacting for 10-20 minutes, separating and purifying, where molar ratio of compound (V) to copper tetrachloride lithium diethyl tetrahydrofuran solution is 25-50:1; and    (4) preparation of compound (V) comprising dissolving 2,7-dibromofluorene in anhydrous dimethylsulfoxide under nitrogen gas protection at room temperature, adding potassium t-butoxide, where molar ratio of 2,7-dibromofluorine to potassium t-butoxide is 1:2.0-2.4, adding carbon disulfide, stirring, reacting for 10-20 minutes, where molar ratio of 2,7-dibromofluorine to carbon disulfide is 1:1-1.2, stirring, slowly adding iodomethane, reacting for 4-6 hours, and separating and purifying.