NOVELTY - Di-thiophene acene copolymer base having a structure of formula (I) on side chain of trialkyl silylacetylene, is claimed.    USE - The di-thiophene acene copolymer base is useful as a light capturing and electronic donor material in an organic solar battery or a hole transport material in an organic field effect transistor (claimed).    ADVANTAGE - The di-thiophene acene copolymer base has better sunlight capturing ability, hole-transporting ability and thermal stability.    DETAILED DESCRIPTION - Di-thiophene acene copolymer base having a structure of formula (I) on side chain of trialkyl silylacetylene, is claimed.    A = 4,7-dimethyl-benzo(1,2,5)thiadiazole compound of formula (a), 4,7-dimethyl-benzo(1,2,5)selenadiazole compound of formula (b), 4,7-dimethyl-benzo(1,2,5)oxadiazole compound of formula (c), 7,7'-dimethyl-(4,4')bi(benzo(1,2,5) thiadiazolyl) compound of formula (d), 4,7-dimethyl-(5,5')bi(benzo(1,2,5)thiadiazolyl) compound of formula (e), 3,6-dimethyl-(1,2,4,5)tetrazine compound of formula (f), 5,5'-dimethyl-(2,2')bithiazolyl compound of formula (g), 3,6-dimethyl-2,5-dihydro-pyrrolo(3,4-c)pyrrole-1,4-dione compound of formula (h), 1,3-dimethyl-thieno(3,4-c)pyrrole-4,6-dione compound of formula (i), 4,7-dimethyl-3a,7a-dihydro-isoindol e-1,3-dione compound of formula (j), 4,6-dimethyl-3H-thieno(3,4-d)isothiazole-2-carboxylic acid compound of formula (k), 2,6-dimethyl-benzo(1,2-d-4,5-d')bis thiazole compound of formula (l), 2,5-dimethyl-thiazolo(5,4-d)thiazole compound of formula (m), 4,7-dimethyl-2H-benzoimidazole compound of formula (n), 4,7-dimethyl-4,5-dihydro-2H-benzotriazole compound of formula (o), 5,8-dimethyl-quinoxaline compound of formula (p), 4,7-dimethyl-(1,2,5)oxadiazolo(3,4-c)pyridine compound of formula (q), 5,8-dimethyl-pyrido(3,4-b)pyrazine of formula (r) or 4,9-dimethyl-2-thia-1,3,5,8-tetraaza-cyclopenta(b)naphthalene compound of formula (s);    R1, R4 = H or 1-30C-alkyl;    R5 = H, F, 1-30C-alkyl or 1-30C-alkoxy;    m = 0-3; and    n = 5-1000.    R1a-R3a = H or 1-12C-alkyl;    R4 = H, 1-30C-alkyl;    R5 = H, F, 1-12C-alkyl or 1-12C-alkoxy.    An INDEPENDENT CLAIM is included for preparing di-thiophene acene copolymer base on side chain of trialkyl silylacetylene comprising adding dibromo monomer of di-thiophene acene copolymer base on side chain of R1 group and oligomerization thiofuran-A-oligomerization thiofuran bi-tin monomer with R2, R3 substituent group into a reaction container at the mole ratio of 1:1, taking toluene as solvent, inducing inert gas to remove air in the reactor and then adding tetra (triphenylphosphine) palladium catalyst and then stirring and reacting at 100-120 degrees C, adding excess potassium fluoride solution with the obtained mixture and then stirring, extracting organic phase and then drying and precipitating, purifying the precipitate using a chromatographic column to obtain di-thiophene acene copolymer base on side chain of trialkyl silylacetylene or adding the dibromo monomer of di-thiophene acene copolymer base on side chain of 3 R1 group and A biborate with R4, R5 substituent group into a reaction container at the mole ratio of 1:1, then adding mixed solution of toluene and potassium carbonate water solution (2 mole/l) at the volume ratio of 1:1; with the obtained mixture, inducing inert gas to remove the air in the reactor and then adding tetra (triphenylphosphine) palladium catalyst and then stirring and reacting at 100-120 degrees C for 12-72 hours, adding excess potassium fluoride solution with the obtained mixture and then stirring, extracting organic phase in the mixture using methanol, acetone and chloroform extract and then drying and precipitating, filtering and concentrating the filtrate, dropping the concentrated organic phase into methanol, purifying the solution using a chromatographic column to obtain bi-thiophene acene copolymer base on side chain of trialkyl silylacetylene, where the mol ratio of the tetra (triphenylphosphine) palladium catalyst and dibromo-monomer of bithiophene acene copolymer base on side chain is 1:10-100.