NOVELTY - A polymer, having a first repeating unit containing aromatic imide or derivative, and a second repeating unit containing at least one electron-accepting or electron-donating cyclic moiety, is new.    USE - For making article e.g. electronic device, optical device, optoelectronic device, thin film semiconductor, composite, field effect transistor device, photovoltaic device, organic light emitting device (claimed), organic light emitting transistors (OLETs), organic light emitting diodes (OLEDs), printable circuits, electrochemical capacitors, solar cells, photodetectors, complementary metal oxide semiconductors (CMOSs), complementary inverters, diodes, capacitors, sensors, D flip-flops, rectifiers, and ring oscillators.    ADVANTAGE - The polymer exhibits high carrier mobility and/or efficient light absorption/emission characteristics, and can possess solution-processability and/or good stability at ambient conditions; exhibits excellent charge transport characteristics in ambient conditions, chemical stability, low-temperature processability, satisfactory solubility in common solvents, and processing versatility (e.g. printability). As a result, field effect devices such as thin film transistors that incorporate the polymer as the semiconductor layer can exhibit high performance in ambient conditions, i.e. demonstrates large electron mobilities, low threshold voltages, and high current on-off ratios. The polymer exhibits semiconductor behavior such as good current modulation characteristics in a field-effect device, light absorption/charge separation in a photovoltaic device, and/or charge transport/recombination/light emission in a light-emitting device. The organic thin film transistors (OTFTs) based on the polymer has long-term operability and continued high-performance in ambient conditions. The polymer exhibits excellent thermal stability over a wide range of annealing temperatures. Photovoltaic devices can maintain satisfactory power conversion efficiencies over extended period of time. The semiconductor materials exhibit n-type semiconductor activity, ambipolar activity, light absorption, and light emission. The polymer exhibits broad optical absorption and/or tuned redox properties and bulk carrier mobilities.    DETAILED DESCRIPTION - A polymer of formula -(M1-M2)n- (I), having a first repeating unit containing aromatic imide or derivative, and a second repeating unit containing at least one electron-accepting or electron-donating cyclic moiety, is new.    M1=compound of formula (Ia) or (Ib) (preferably compounds of formulae (Ic)-(Ii));    X=N, CH or CR1d;    q=0-3;    a and a1=optionally substituted fused ring moiety;    R1=H, 1-40C alkyl, 2-40C alkenyl, 2-40C alkynyl, 1-40C haloalkyl, -L-R1a, -L-Ar1, -L-Ar1-Ar1, -L-Ar1-R1a, -L-Ar1-Ar1-R1a, -L-Cy1, -L-Cy1-Cy1, -L-Cy1-R1a or L-Cy1-Cy1-R1a;    L=-O-, -Y1-O-Y1-, -S-, -S(O)-, -Y1-S-Y1-, -C(O)-, -NR1cC(O)-, -C(O)NR1c-, -NR1c-, -Si(R1c)2, -Y1-(Si(R1c)2)-Y1-, divalent 1-20C alkyl, divalent 1-20C alkenyl, divalent 1-20C haloalkyl or covalent bond;    Ar1=6-14C aryl or 5-14 membered heteroaryl (each optionally substituted with mono to penta substituents selected from halogen, -CN, oxo, =C(CN)2, 1-6C alkyl, 1-6C alkoxy or 1-6C haloalkyl);    Cy1=3-14C cycloalkyl or 3-14 membered cycloheteroalkyl (each optionally substituted with mono to penta halogen, -CN, oxo, =C(CN)2, 1-6C alkyl, 1-6C alkoxy or 1-6C haloalkyl);    R1a=1-40C alkyl, 2-40C alkenyl, 2-40C alkynyl, 1-40C haloalkyl, 1-40C alkoxy, -L'-R1b, -L'-Ar2, -L'-Ar2-Ar2, -L'-Ar2-R1b, -L'-Ar2-Ar2-R1b, -L'-Cy2, -L'-Cy2-Cy2, -L'-Cy2-R1b or -L'-Cy2-Cy2-R1b;    L'=L;    Ar2=Ar1;    Cy2=Cy1;    R1b=1-40C alkyl, 2-40C alkenyl, 2-40C alkynyl, 1-40C haloalkyl or 1-40C alkoxy;    R1c=H, 1-6C alkyl or -Y1-6-14C aryl;    Y1=divalent 1-6C alkyl, divalent 1-6C haloalkyl or a covalent bond;    W1=C(O) or a covalent bond;or    N+W1+R1=5-14 membered cyclic moiety (optionally substituted with mono to tetra R1d);    R1d=halogen, -CN, -NO2, oxo, =C(R1e)2, 1-40C alkyl, 2-40C alkenyl, 2-40C alkynyl, 1-40C haloalkyl, -Y1-3-10C cycloalkyl, -Y1-6-14C aryl, -Y1-6-14C haloaryl, -Y1-3-12 membered cycloheteroalkyl, or Y1-5-14 membered heteroaryl (where each of 1-40C alkyl, 2-40C alkenyl, 2-40C alkynyl, 3-10C cycloalkyl, 6-14C aryl, 6-14C haloaryl, 3-12 membered cycloheteroalkyl, and 5-14 membered heteroaryl groups are optionally substituted with mono to tetra R1e);    R1e=halogen, CN, NO2, oxo, OH, -O-1-20C alkyl, -O-6-14C aryl, -NH2, -NH(1-20C alkyl), -N(1-20C alkyl)2, -N-1-20C alkyl-6-14C aryl, -N(6-14C aryl)2, -S(O)mH, -S(O)m-1-20C alkyl, -S(O)2OH, -S(O)m-O-1-20C alkyl, -S(O)m-O-6-14C aryl, -CHO, -C(O)-1-20C alkyl, -C(O)-6-14C aryl, -C(O)OH, -C(O)-O-1-20C alkyl, -C(O)-O-6-14C aryl, -C(O)NH2, -C(O)NH-1-20C alkyl, -C(O)N(1-20C alkyl)2, -C(O)NH-6-14C aryl, -C(O)N(1-20C alkyl)(6-14C aryl), -C(O)N(6-14C aryl)2, -C(S)NH2, -C(S)NH-1-20C alkyl, -C(S)N(1-20C alkyl)2, -C(S)N(6-14C aryl)2, -C(S)N(1-20C alkyl)-6-14C aryl, -C(S)NH-6-14C aryl, -S(O)mNH2, -S(O)mNH(1-20C alkyl), -S(O)mN(1-20C alkyl)2, -S(O)mNH(6-14C aryl), -S(O)mN(1-20C alkyl)-6-14C aryl, -S(O)mN(6-14C aryl)2, -SiH3, -SiH(1-20C alkyl)2, -SiH2(1-20C alkyl), -Si(1-20C alkyl)3, 1-20C alkyl, 2-20C alkenyl, 2-20C alkynyl, 1-20C alkylthio, 1-20C haloalkyl, 3-10C cycloalkyl, 6-14C aryl, 6-14C haloaryl, 3-12 membered cycloheteroalkyl, or 5-14 membered heteroaryl;    M2=-(Ar)m-b2-(Ar)m1-, -(Ar)m-Z1-(Ar)m1-, -(Ar)m2-, -Z1-b2-Z1-, -Z1-(Ar)m1-Z1-, -Z1-b2-(Ar)m1-b2-Z1-, -b2-(Ar)m2-b2-, -Z1-(Ar)m-b2-(Ar)m1-Z1- or -b2-Z1-b2- (preferably compound selected from 58 compounds as given in the specification e.g. compound of formula (Ij), (Ik), (Im), (Io) or (Ip));    b2=optionally substituted fused ring moiety;    Ar=optionally substituted 5- or 6-membered (hetero)aryl;    Z1= conjugated linear linker;    m, m1 and m2=0-6;and    n=greater than 2.    Provided that M1 is not perylene tetracarboxylic acid diimide, perylene dicarboxylic acid imide, naphthalene tetracarboxylic acid diimide, or naphthalene dicarboxylic acid imide. INDEPENDENT CLAIMS are included for the following:    (1) a composition comprising at least one polymer (I) dissolved or dispersed in a liquid medium;    (2) a thin film semiconductor (A1) comprising at least one polymer (I);    (3) a composite (A2) comprising a substrate and thin film semiconductor (A1) deposited on the substrate;    (4) a field effect transistor device comprising the thin film semiconductor (A1) or the composite (A2);    (5) a photovoltaic device comprising (A1) or (A2); and    (6) making an article involving depositing the composition onto a substrate.