NOVELTY - A planar organic compound (I) is new. The planar organic compound is capable of forming super molecules by absorbing electromagnetic radiation in predetermined spectral subrange at wavelength of 400-3000 nm. A solution containing the organic compound or its salt is capable of forming solid photovoltaic layer on a substrate.    USE - Novel predominant planar organic compound is used for organic photovoltaic layer for organic photovoltaic device (both claimed) used for electronic equipment such as computer monitor, display and exposure meter, and for optoelectronic device and solar cell.    ADVANTAGE - The predominant planar organic compound economically provides organic photovoltaic device having excellent photovoltaic conversion efficiency.    DETAILED DESCRIPTION - A planar organic compound of formula (I) is new. The planar organic compound is capable of forming super molecules by absorbing electromagnetic radiation in predetermined spectral subrange at wavelength of 400-3000 nm. A solution containing organic compound or its salt is capable of forming solid photovoltaic layer on a substrate.    Het1=planar polycyclic molecular system of primary type, preferably heterocyclic molecular system;    Het2= planar polycyclic molecular system of secondary type;    A=bridging group having lateral bond of molecular system Het1 with the molecular system Het2 through strong chemical bond chosen from covalent bond, coordination bond and/or ionic bond;    B1,B2=binding group, and molecular system Het1, bridging group A and molecular system Het2 are combined to form a donor bridge-acceptor system providing dissociation of excited electron-hole pad, and primary-type predominantly planar polycyclic molecular system and/or secondary-type predominantly planar polycyclic molecular system adsorbs electromagnetic radiation in different predetermined spectral within wavelength of 400-3000 nm;    S1,S2=group having solubility of organic compound chosen from COO-, SO3-, HPO3- and/or PO32-, amide of acid residue chosen from CONR1R2, CONHCONH2 and/or SO2NR1R2, or alkyl chosen from methyl, ethyl, propyl, butyl, i-butyl and/or t-butyl, aryl chosen from phenyl, benzyl and/or naphthyl, substituted alkyl and/or substituted aryl;    R1,R2=H, alkyl or aryl;    D1,D2=-CH3-,- C2H5-, -C3H7-, -NO2, -Cl-, -Br-, -F-, -CF3-, -CN-, -OH-, -OCH3-, -OC2H5-, -OCOCH3-, -OCN-, -SCN-, -NH2, -NHCOCH3-, -C2Si(CH3)2 and/or -CONH2-;and    i,j,k,m,n,y,z=1, 2, 3, 4, 5, 6, 7 or 8.