NOVELTY - An optoelectronic device comprises anode, cathode, optionally at least one anode interlayer, optionally at least one cathode interlayer, and a photoactive component between the anode and the cathode, where the photoactive component contains fullerene compound and random copolymer, where the random copolymer contains first repeating unit and second repeating unit different from the first repeating unit, where the random copolymer has a molecular weight of 3000-300000.    USE - As an optoelectronic device comprising organic photovoltaic device, organic photodetector (claimed), solar cells, photovoltaic cells, light emitting diodes, light emitting transistors, and field effect transistors.    ADVANTAGE - The device is an organic photovoltaic device having a power conversion efficiency of at least 5%. The optoelectronic device exhibits high performance in ambient conditions, e.g. demonstrating low band-gap, high fill factor, high open circuit voltage, and high power conversion efficiency.    DETAILED DESCRIPTION - An optoelectronic device comprises anode, cathode, optionally at least one anode interlayer, optionally at least one cathode interlayer, a photoactive component between the anode and the cathode, where the photoactive component contains fullerene compound and random copolymer, where the random copolymer contains first repeating unit and second repeating unit different from the first repeating unit, where the first repeating unit is of formula -(T1-A1)- and the second repeating unit of formula (T2-A2)-, where the random copolymer has a molecular weight of 3000-300000.    T1=group of formula (ia);    T2=group of formula (iia);    A1=group of formula (ib) or (ic);    A2=group of formula (iib) or (iic);    R1 and R2=1-40C alkyl or 1-40C haloalkyl;    R'a and R'b=1-40C alkyl, 2-40C alkenyl, or 1-40C haloalkyl;    X1 and X2=N or CH;    R3 and R4=H, 1-40C alkyl, or 1-40C haloalkyl;    R'c and R'd=1-40C alkyl, 2-40C alkenyl or 1-40C haloalkyl;    X3 and X4=N or CH;    A1 and A2=group of formula (iiia);    X'a, X'b, X'c, X'd, X'e, X'f, X'g, and X'h=-S-, -O-, -N=, -CH=CH-, or -CH=;    Z'a, Z'b, Z'c, and Z'd=-CR6=, -SiR6R6-, -NR6-, or covalent bond;    R6=-R5, -OR5, -SR5, or -Y'-R5;    Y'=divalent 6-14C aryl or divalent 5-14 membered heteroaryl;    R5=1-40C alkyl or 2-40C alkenyl (both optionally mono- to deca-substituted with halo, -CN, -NH2, -NH(1-20C alkyl), -N(1-20C alkyl)2, -SiH3, -SiH(1-20C alkyl)2, -SiH2(1-20C alkyl), -Si(1-20C alkyl)3, -O-1-20C alkyl or -S-1-20C alkyl), or 1-40C haloalkyl.    Provided that at least one of Z'a and Z'b and at least one of Z'c and Z'd are selected from -CR6=, -SiR6R6-, or -NR6-.