NOVELTY - Organic acid compounds (I) are new, where (I) absorb electromagnetic radiation in at least one predetermined spectral subrange within a wavelength of 400-3000 nm, and aqueous solution of water-soluble salt of (I) is capable of forming a photoelectric layer of rodlike supramolecules on a substrate.    USE - (I) are useful in organic solar cells (claimed).    ADVANTAGE - (I) absorb electromagnetic radiation in at least one predetermined spectral subrange within a wavelength of 400-3000 nm. The aqueous solution of water-soluble salt of (I) is capable of forming a photoelectric layer of rodlike supramolecules on a substrate (all claimed).    DETAILED DESCRIPTION - Organic acid compounds of formula (I) are new, where (I) absorb electromagnetic radiation in at least one predetermined spectral subrange within a wavelength of 400-3000 nm and aqueous solution of water-soluble salt of (I) is capable of forming a photoelectric layer of rodlike supramolecules on a substrate.    Het = planar conjugated heterocyclic molecular system;    X = an acid group;    m = 1-8;    Y1 = amide of acid group;    n = 1-4;    R = -CH3, -C2H5, -NO2, -Cl, -Br, -CF3, -CN, -OH, -OCH3, -OC2H5, -OCOCH3, -OCN, -SCN, -NH2 or -NHCOCH3; and    z = 0-4.    An INDEPENDENT CLAIM is included for an organic solar cell comprising: a first electrode and a second electrode spaced from each other, an organic ionic-crystalline photoelectric layer located between the first electrode and the second electrode and contacting with the first electrode; and an electrolyte located between the organic ionic-crystalline photoelectric layer and the second electrode and impregnating the organic ionic-crystalline photoelectric layer, where the organic ionic-crystalline photoelectric layer absorbs electromagnetic radiation in at least one predetermined spectral subrange within a wavelength of 400-3000 nm and consists of rodlike supramolecules, which comprise at least one organic compounds of formula (II).    K1 = H+, NH4+, Na+, K+, Li+, Ba2+, Ca2+, Mg2+, Sr2+ or Zn2+; and    p = number of counterions providing neutral state of the molecule.