NOVELTY - A perylene polymer comprising: optionally substituted perylene imides linked by repeating units comprising at least one monocyclic (hetero)aryl moiety, is new.    USE - For manufacturing an article selected from an electronic device, an optical device, or an optoelectronic device (preferably thin film semiconductor, field effect transistor device, photovoltaic device, and organic light emitting device) (claimed), such as thin film transistors, photovoltaics, photodetectors, organic light emitting diodes (OLEDs), organic light emitting transistors (OLETs), complementary metal oxide semiconductors (CMOSs), complementary inverters, diodes, capacitors, sensors, D flip-flops, rectifiers, and ring oscillators.    ADVANTAGE - The perylene-based semiconducting polymers address various deficiencies and shortcomings of the prior art n-channel molecular semiconductors, such as poor processability and/or negligible electron mobilities under the ambient conditions. The n-type perylene-based semiconducting polymers have excellent charge transport characteristics under ambient conditions, chemical stability (e.g. air stability) in ambient conditions, low-temperature processability, large solubility in common solvents, processing versatility (e.g. printability), and solution processability. The solution-processability includes various solution-phase processes including spin-coating, printing (e.g. inkjet printing, screen printing, pad printing, offset printing, gravure printing, flexographic printing, lithographic printing, and mass-printing), spray coating, electrospray coating, drop casting, dip coating, and blade coating. The polymers exhibit semiconductor behavior by exhibiting high carrier mobility and/or 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. Thus, the field effect devices such as thin film transistors that incorporate these polymers as the semiconductor layer have high performance under ambient conditions such as large electron mobilities, low threshold voltages, and high current on-off ratios. The other organic semiconductor-based devices such as organic photovoltaics (OPVs), organic light emitting transistors (OLETs), and organic light emitting diodes (OLEDs) can be fabricated efficiently using the polymeric materials. The polymers can be used to prepare either p-type or n-type semiconductor materials, which in turn are useful for fabricating various organic electronic articles, structures and devices including field-effect transistors, unipolar circuitries, complementary circuitries, photovoltaic devices, and light emitting devices.    DETAILED DESCRIPTION - A perylene polymer of formula -(-M1-M2-)n- (I) is new.    M1=optionally substituted perylene imide selected from groups of formulae (i) and (ii);    pi -1=a perylenyl group (optionally substituted by 1-6 substituents selected from an electron-withdrawing group, and 1-40C alkyl (optionally substituted by 1-5 electron-withdrawing groups));    pi -1'=a perylenyl group (optionally substituted by 1-8 substituents selected from an electron-withdrawing group, and 1-40C alkyl (optionally substituted by 1-5 electron-withdrawing groups));    R1, R2, and R5=1-40C (halo)alkyl, 2-40C alkenyl (both optionally substituted by 1-10 substituents selected from halo, -CN, NO2, OH, -NH2, -NH(1-20C-alkyl), -N(1-20C-alkyl)2, -S(O)2OH, -CHO, -C(O)-1-20C-alkyl, -C(O)OH, -C(O)-O-1-20C-alkyl, -C(O)NH2, -C(O)NH-1-20C-alkyl, -C(O)N(1-20C-alkyl)2, -O-1-20C-alkyl, -SiH3, -SiH(1-20C-alkyl)2, -SiH2(1-20C-alkyl), or -Si(1-20C-alkyl)3; and optionally covalently bonded to the imide nitrogen atom via an optional linker); 1-4 cyclic moieties (all optionally covalently bonded to each other or the imide nitrogen via an optional linker; and optionally substituted by 1-5 substituents selected from halo, oxo, -CN, NO2, OH, =C(CN)2, -NH2, -NH(1-20C-alkyl), -N(1-20C-alkyl)2, -S(O)2OH, -CHO, -C(O)OH, -C(O)-1-20C-alkyl, -C(O)-O-1-20C-alkyl, -C(O)NH2, -C(O)NH-1-20C-alkyl, -C(O)N(1-20C-alkyl)2, -SiH3, -SiH(1-20C-alkyl)2, -SiH2(1-20C-alkyl), -Si(1-20C-alkyl)3, -O-1-20C-(halo)alkyl, -O-1-20C-alkenyl, 1-20C (halo)alkyl, and 1-20C alkenyl); or H;    M2=a repeating unit comprising at least one monocyclic moiety selected from -(Ar)m-, -(Ar)m-Z-(Ar)m-, or -(Ar)m-( pi -2)-(Ar)m-;    Ar=optionally substituted monocyclic (hetero)aryl;    pi -2=optionally substituted polycyclic moiety;    Z=a conjugated linear linker;    m=1-6;    n= greater than or equal to 2.    INDEPENDENT CLAIMS are included for the following:    (1) a composition (C1) comprising: at least one polymer (I) dissolved or dispersed in a liquid medium;    (2) an article (A) comprising: at least polymer (I);    (3) a thin film semiconductor (A') comprising: at least one polymer (I);    (4) a composite (C2) comprising: a substrate and the thin film semiconductor (A') deposited on the substrate;    (5) a field effect transistor device comprising: the thin film semiconductor (A'), or the composite (C2);    (6) a photovoltaic device comprising: the thin film semiconductor (A'), or the composite (C2);    (7) an organic light emitting device comprising: the thin film semiconductor (A'), or the composite (C2); and    (8) method for making the article (A) involving: depositing the composition (C1) onto a substrate.