NOVELTY - Compound containing at least one functionalized fullerene (A) is new.    USE - (A) is useful in the construction of photovoltaic devices such as photovoltaic cells, photovoltaic modules, solar cells and solar modules (all claimed).    ADVANTAGE - (A) improves the efficiency of the photovoltaic devices.    DETAILED DESCRIPTION - Compound containing at least one functionalized fullerene (A) of formula (C9 x-A9 i-Y9 m-B9 n-Y1 m1-B1 n1-Y2 m2-A1 i1K1 p) (I) or (C9 x-(A9 i-Y9 m-B9 n-Y1 m1-B1 n9-Y2 m2-A1 i1) (II) is new.    C9 x=fullerene;    x=50-250;    A9, A1=condensed ring with the fullerene group comprising 3-6C cycloalkyl or 3-6C heterocyclyl containing 1-3 of N, O or S;    i, i1=0 or 1;    Y9, Y1, Y2=aromatic or heteroaromatic divalent organic group (optionally substituted with linear or branched 1-20C alkyl, linear or branched 2-20C alkenyl, linear or branched 2-20C alkinyl, linear or branched 2-20C alkoxy or COOR1) or a divalent organic group containing at least one thienylene unit;    R1=linear or branched 1-20C alkyl;    B9, B1=divalent organic group containing at least one thienylene unit optionally substituted with linear or branched 1-20C alkyl, linear or branched 2-20C alkenyl, linear or branched 2-20C alkinyl, linear or branched 2-20C alkoxy or COOR1;    m, m1, m2, n, n1=0 or 1;    m+n+m1+n1+m2=2-5 (preferably 3);    K1=linear or branched 1-20C alkyl, linear or branched 2-20C alkenyl, linear or branched 2-20C alkinyl, linear or branched 2-20C alkoxy, CHO or COOR1; and    p=0-5.    Provided that: at least one of m1 and m2 is different from 0; at least one of n and n1 is different from 0; when at least one Y9, Y1 or Y2 and at least one B9 or B1 are present, then, Y9 and/or Y1, and/or Y2 alternate with B9 and/or B1; when K1 is a C x fullerene, A9 and A1 are N-alkyl pyrrolidine, m and m2 are 0, and B9 and B1 are a divalent organic group containing at least one thienylene unit, then Y1 is not an N-alkyl pyrrole; and when K1 is a C x fullerene, A9 and A1 are an N-alkyl pyrrolidine, Y9 and Y2 are phenyl, and B9 and B1 are divalent organic group containing at least one thienylene unit, then Y9 is not an N-alkyl pyrrole.