NOVELTY - An organic ruthenium dye, is new.    USE - The organic ruthenium dye is useful for dye-sensitized solar cell.    ADVANTAGE - The organic ruthenium dye has short circuit current (Jsc) of 17.8-18.33 mA/cm2, open circuit voltage (Voc) of 725-760 mV, filling factor (ff) of 0.734-0.776, and photoelectric conversion efficiency of 9.5-10.5%.    DETAILED DESCRIPTION - An organic ruthenium dye of Formula I, is new.    R1=aromatic hydrocarbon and derivatives;    R2=H, alkyl, alkoxyl, cycloalkyl, haloalkyl, halo, hetero ring; and    n= greater than or equal to 0.    An INDEPENDENT CLAIM is a dye-sensitized solar cell made of the organic ruthenium dye comprising transparent substrate (1), conductive layer (2), light absorbing layer (3), electrolyte layer (6) and pair electrode (7), where the conductive layer (2), light absorbing layer (3), electrolyte layer (6) and pair electrode (7) are orderly connected between two transparent substrates (1), the light absorbing layer (3) is semiconductor nanometer particle layer (4) and dye layer (5), the semiconductor nanometer particle layer (4) connects with conductive layer (2), and the dye layer (5) connects with electrolyte layer (6). The transparent substrate (1) is made of glass substrate or plastic, where the plastic is poly-p-benzoic acid glycol ester, polynaphthalic acid glycol ester, polycarbonate, polypropylene, polyimide, triacetyl cellulose, or polyether sulfone. The conductive layer (2) is made of tin indium oxide, tin fluorine oxide, zinc oxide-gallium oxide (ZnO-Ga2O3), zinc oxide-aluminum oxide (ZnO-Al2O3), tin based oxide, antimony tin oxide, or zinc oxide. The semiconductor nanometer particle of semiconductor nanometer particle layer (4) is silicon (Si), titanium oxide (TiO2), stannous oxide (SnO2), zinc oxide (ZnO), tungsten(III) oxide (WO3), neodymium pentaoxide (Nb2O5), and titanium-strontium oxide (TiSrO3), having average particle diameter of semiconductor nanometer particle equal to less than or equal to 50 nm. The dye layer (5) is made from the organic ruthenium dye. The electrolyte layer (6) is iodine or lithium iodide electrolyte or ion liquid, and organic hole-transporting material. The ion liquid comprises anion and cation, where the anion is iodide ion (I-), bromide ion (Br-), chloride ion (Cl-), cyanogens ion ((N(CN)2)-), bis(trifluoromethane) imide ion ((N(SO2CF3)2)-), hexafluorophosphate ion ((PF6)-), tetrafluoroborate ion ((BF4))-, nitrate ion ((NO3)-), trifluoromethane carboxylate ion ((CF3COO)-), perchlorate ion ((ClO4)-), boron trifluoride chlorotrifluoromethane ((BF3CF3)-), trifluoromethane sulfonic ion ((CF3SO3)-), aluminum tetrachloride ((AlCl4)-), or hexafluorosilicate ((SiF6)2-), and the cation is of the structures given in the specification. The organic hole-transporting material is 2,2',7,7'-tetra-bi(N, N'-di-P-methoxyamine)9,9'-spirobifluorene. The pair electrode (7) is made of platinum (Pt), gold (Au), nickel (Ni), copper (Cu), silver (Ag), indium (In), ruthenium (Ru), palladium (Pd), rhodium (Rh), iridium (Ir), osmium (Os), carbon (C), or conductive polymer. The conductive polymer is polyanilines, polypyrrole, polythiophene, polyp-phenylene vinylene, or polyether.    DESCRIPTION OF DRAWING(S) - The drawing shows sectional view of the dye-sensitized solar cell made of the organic ruthenium dye.    Transparent substrate; (1)    Conductive layer; (2)    Light absorbing layer; (3)    Electrolyte layer; and (6)    Pair electrode (7)