NOVELTY - Polymers (Q) having dithieno(3,2-c;2',3'-e)azepine-4,6-dione structures (I) are new.    USE - (Q) are useful as semiconductor components for organic photovoltaic device (claimed), and as organic semiconductors in organic and hybrid optical, optoelectronic, and/or electronic devices such as photovoltaic cells, LEDs, light emitting transistors and FETs.    ADVANTAGE - (Q) provide improved device performance, such as improved power conversion efficiency, fill factor, open circuit voltage, field-effect mobility, on/off current ratios, and/or air stability when used in photovoltaic cells or transistors. (Q) have good solubility in common solvents enabling device fabrication via solution processes.    DETAILED DESCRIPTION - Polymers (Q) having dithieno(3,2-c;2',3'-e)azepine-4,6-dione structures of formula (I) are new.    Het1, Het11 = an optionally substituted 5-8 membered heteroaryl group or a covalent bond;    R1a, R1b = R1 or -L-Ar1;    R1 = 1-40C-(halo)alkyl or 2-40C-alkenyl;    L = -O-, -S-, -Se-, -OC(O)-, -C(O)O-, a divalent 1-20C-(halo)alkyl or a covalent bond; and    Ar1 = 6-20C-aryl or 5-20 membered heteroaryl (both optionally substituted);    P1, P2 = an optionally substituted electron-rich 8-20 membered polycyclic heteroaryl, a linear conjugated linker or a divalent radical of formula (a1);    p = 1-4;    x, y = 0.05-0.95, where the sum of x and y is 1; and    n = 2-10000.    Provided that Het1 and Het11 are different, R1a and R1b are different and P1 and P2 are different, where at least one of the above is true. An INDEPENDENT CLAIM is included for an organic photovoltaic device comprising an anode (22), a cathode (26), optionally one or more anode interlayers, optionally one or more cathode interlayers, and a polymeric semiconductor component comprising (Q) present between the anode and the cathode.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of an organic photovoltaic device structure.    Substrate (20)    Anode (22)    Photoactive layer (24)    Cathode. (26)