NOVELTY - A composition, comprises: (a) a diketopyrrolopyrrole compound (I); and (b) a polymeric material; provided that if the polymeric material is a diketopyrrolopyrrole (DPP) polymer, then the quotient of the weight average molecular weight of the DPP polymer and the molecular weight of the repeating unit of the polymer is at least 5.    USE - In a semiconductor device in the form of diode, photodiode, sensor, organic field effect transistor, transistor for flexible displays, or hetero-junction solar cell, preferably as a p-type transistor (claimed); or as organic semiconductor in organic devices, especially in organic photovoltaics (solar cells) and photodiodes, or in a device containing a diode and/or an organic field effect transistor.    ADVANTAGE - The composition exhibits high efficiency of energy conversion, excellent field-effect mobility, good on/off current ratios and/or excellent stability, when used in organic field effect transistors, organic photovoltaics (solar cells) and photodiodes.    DETAILED DESCRIPTION - A composition, comprises: (a) a diketopyrrolopyrrole compound of formula (I); and (b) a polymeric material; provided that if the polymeric material is a diketopyrrolopyrrole (DPP) polymer, then the quotient of the weight average molecular weight of the DPP polymer and the molecular weight of the repeating unit of the polymer is at least 5.    p=0 or 1;    q=0 or 1;    A1 and A2=-(Ar1)a-(Ar2)b-(Ar3)c-R3;    R5, A3, A4 and A5=-(Ar4)k-(Ar5)l-(Ar6)r-(Ar7)z-;    a=1 or 2;    b=0, 1 or 2;    c=0, 1 or 2;    k=0, 1, or 2;    l=1, 2, or 3;    r=0 or 1;    z=0, 1 or 2;    R1, R2, R'1, R'2, R1a, R2a, R1b and R2b=e.g. 1-100C alkyl, 2-100C alkenyl;    R3=e.g. H, halo, R5 or R6;    R5=selected from 11 groups as given in the specification, e.g. group of formula (i);    R6=selected from 6 groups as given in the specification, e.g. group of formula (ii);    Ar1-Ar7=selected from bivalent groups of 33 compounds as given in the specification, e.g. group of formula (iii);    X=e.g. -O-, group of formula (ia)-(viiia);    R10 and R11=e.g. H, 1-18C alkyl;    R12 and R13=e.g. 1-18C alkyl;or    R12+R13=oxo, =C(R14)(R15) or 5-to 6-membered ring (optionally substituted by 1-C alkyl or 1-18C alkoxy);    R14 and R15=e.g. H, 1-18C alkyl;    R16 and R17=e.g. halo;    R18 and R19=e.g. H, 1-18C alkyl;    R20 and R21=e.g. H, 1-25C alkyl;or    R20+R21=e.g. alkylene;    R30-R38=e.g. H;    R40 and R41=e.g. H;    R50=e.g. 1-25C alkyl;    R60-R68=e.g. H, halo;    D'=e.g. -CO-;    E'=e.g. 1-8C thioalkoxy;    R39 and R'39=e.g. H.    Full Definitions are given in DEFINITIONS field Full Definitions section. INDEPENDENT CLAIMS are included for the following:    (1) new intermediate compound of formula (II) (provided that a compound of formula (II') is excluded);    (2) new intermediate compound of formula (III) (provided that Ar1, Ar4, Ar5, or Ar7 does not represent a six membered ring which is attached directly to the diketopyrrolopyrrole moiety, and (A) and (B) are excluded;    (3) preparation of the compound (III) or compound of formula (IIb); and    (4) new compound of formula (X).    R103=2-hexyldecyl;    y=3 or 4.