NOVELTY - A polymeric compound comprising 4-10000 bithiophene-3,3'dicarboximide-2,2'-diyl repeating units (I), is new.    USE - New polymeric compound is used for electronic/opto-electronic/optical device e.g. field effect transistor, organic light-emitting transistor and organic photovoltaic device (all claimed). Uses include but are not limited to film semiconductor, photovoltaic, photodetector, organic light-emitting diode, organic light emitting transistor, inverter, capacitor, sensor, D flip-flop, rectifier, etc.    ADVANTAGE - The polymeric compound has excellent charge transport characteristics, chemical stability, low-temperature processability and solubility. The electronic device is efficiently fabricated using the polymeric compound.    DETAILED DESCRIPTION - A polymeric compound comprising 4-10000 bithiophene-3,3'dicarboximide-2,2'-diyl repeating units of formula (I), is new.    X=O, S, and Se;and    R1=H, organic group chosen from 1-4 cyclic moieties (optionally substituted by 1-5 substituent chosen from halo, oxo, -CN, NO2, OH, C(CN)2, -NH2, -NH(1-40C alkyl), -N(1-40C alkyl)2, -S(O)2OH, -CHO, -C(O)OH, -C(O)-1-40C alkyl, -C(O)-O-1-40C alkyl, -C(O)NH2, -C(O)NH-1-40C alkyl, -C(O)N(1-40C alkyl)2, -SiH3, -SiH(1-40C alkyl)2, -SiH2(1-40C alkyl), -Si(1-40C alkyl)3, -O-1-40C alkyl, -O-1-40C alkenyl, -O-1-40C haloalkyl, 1-40C alkyl, 1-40C alkenyl and 1-40C haloalkyl), in which 1-4 cyclic moieties of organic group is bonded covalently to each other or imide nitrogen through linker, or 1-40C alkyl, 2-40C alkenyl, 1-40C haloalkyl (all optionally substituted by 1-10 substituent chosen from halo, -CN, NO2, OH, -NH2, -NH(1-40C alkyl), -N(1-40C alkyl)2, -S(O)2OH, -CHO, -C(O)-1-40C alkyl, -C(O)OH, -C(O)-O-1-40C alkyl, -C(O)NH2, -C(O)NH-1-40C alkyl, -C(O)N(1-40C alkyl) 2, -O-1-40C alkyl, -SiH3, -SiH(1-40C alkyl)2, -SiH2(1-40C alkyl), and -Si(1-40C alkyl)3), in which 1-40C alkyl, 2-40C alkenyl and 1-40C haloalkyl are bonded covalently or directly to imide nitrogen atom through linker.    An INDEPENDENT CLAIM is included for electronic/opto-electronic/optical device, which consists of semiconductor material comprising polymeric compound(s).