NOVELTY - A dipyridyl-ruthenium containing dye compound or its salt is new. The compound comprises sulfur, selenium or tellurium.    USE - A dipyridyl-ruthenium containing dye compound for preparation of a dye-sensitized solar cell (claimed).    ADVANTAGE - The dye compound is easily purified, and has simple preparation, low cost and high productivity. The dye-sensitized solar cell including a dye compound used as sensitizer, has above 90% monochromatic photoelectric conversion efficiency and 10.31-10.59% power conversion efficiency.    DETAILED DESCRIPTION - A dipyridyl-ruthenium containing dye compound of formula (1) or its salt is new. The compound comprises sulfur, selenium or tellurium.    Y1,Y2 = H, Li, Na, K, monovalent ion, or multivalent ion including one half Ca2+, one half Mg2+ or 1/3Fe3+;    X1, X2 = one or more of three compounds of formula (2)-4);    Ra, Ra'= H, alkyl, alkoxyl, naphthyl, alkyl halide, halo, heterocyclic group, -(CH2-CH2-O-CH2)t-CH2-O- or -(CH2-CH2-O-CH2)t-CH2-O-CH2-;    n, t = 1-6;    X = O, S, Se or Te; and    Y'= S, Se or Te.    An INDEPENDENT CLAIM is included for a dye-sensitized solar cell prepared by using dipyridyl-ruthenium containing dye compound, and comprising transparent substrate layers (1), conductive layer (2), light absorbing layer (3), electrolyte layer (6) and counter electrode (7). Two transparent substrate layers are connected with conductive layer, light absorbing layer, electrolyte layer and counter electrode in sequence. The light absorbing layer comprises a semiconductor nano granule layer and dye layer (5). The semiconductor nano granule layer is connected with conductive layer. The dye layer is connected with electrolyte layer. The transparent substrate layer comprises a glass substrate or plastic. The plastic is polyethylene glycol terephthalate, polyethylene naphthalate, polycarbonate, polypropylene, polyimide, triacetyl cellulose or polyether sulfone. The conductive layer comprises indium tin oxide, fluorine-doped indium oxide, zinc oxide (ZnO)-gallium oxide, ZnO-aluminum oxide, tin oxide, antimony tin oxide or zinc oxide. The semiconductor nano granule of semiconductor nano granule layer is silicon, titanium dioxide, stannous oxide, ZnO, tungsten (III) oxide, niobium pentoxide or titanium strontium oxide; and has average granular diameter of 0-50 nm. The dye layer comprises dipyridyl-ruthenium containing dye compound. The electrolyte layer comprises an iodine/lithium iodide electrolyte, or ionic liquid and hole transmission organic material. The ionic liquid comprises an anion portion and cation portion. The anion is iodide anion, bromide anion, chloride anion, (N(CN)2)-, (N(SO2CF3)2)-, (PF6)-, (BF4)-, nitrate anion, (C(CN)3)-, (B(CN)4)-, (CF3COO)-, (ClO4)-, (BF3CF3)-, (CF3SO3)-, (CF3F2SO3)-, (CH3H2SO3)-, ((CF3SO2)2N)-, ((C2H5SO2)2N)-, ((CF3SO2)3C)-, ((C2F5SO2)3C)-, ((FSO2)3C)-, (CH3CH2OSO3)-, (CF3C(O)O)-, (CF3CF2C(O)O)-, (CH3CH2C(O)O)-, (CH3C(O)O)-, (P(C2H5)3F3)-, (P(CF3)3F3)-, (P(C2F4H)(CF3)2F3))-, (P(C2F5H2)3F3)-, (P(C2F5)(CF3)2F3)-, (P(CF3)3F3)-, (P(C6H5)3F3)-, (P(C3H7)3F3)-, (P(C4H9)3F3)-, (P(C2H5)2F4)-, ((C2H5)2P(O)O)-, ((C2H5)2P(O)O2)2-, (PC6H5)2F4)-, ((CF3)2P(O)O)-, ((CH3)2P(O)O)-, ((C4H9)2P(O)O)-, (CF3P(O)O2)2-, (CH3P(O)O2)2-, ((CH3O)2P(O)O)-, (BF2(C2F5)2)-, (BF3(C2F5))-, (BF2(CF3)2)-, (B(C2F5)4)-, (BF3(CN))-, (BF2(CN)2)-, (B(CF3)4)-, (B(OCH3)4)-, (B(OCH3)2(C2H5))-, (B(O2C2H4)2)-, (B(O2C2H2)2)-, (B(O2CH4)2)-, (N(CF3)2)-, aluminum tetrachloride anion or hexafluorosilicate anion ((SiF6)2-). The cation is one or more of nine compounds e.g. formula (A). The hole transmission organic material is 2,2',7,7'-tetra-bis(N,N-di-phospho-methoxyamino)9,9'-difluoride. The counter electrode comprises platinum, gold, nickel, copper, silver, indium, ruthenium, palladium, rhodium, iridium, osmium, carbon and/or conductive polymer. The conductive polymer is polyaniline, polypyrrole, polythiophene, poly(phenylene vinylene) or polyether.