NOVELTY - Organic dye comprises five-membered heterocyclic compound as conjugated unit.    USE - Organic dye used for dye sensitization solar battery (claimed).    ADVANTAGE - The dye has higher synthesis yield of 40-70%, and excellent performance of spectrum absorption of dye and mol extinction coefficient. The maximum value of the quantum conversion efficiency of the dye sensitization solar battery prepared by dye reaches 97% and photoelectricity conversion efficiency at more than 8%.    DETAILED DESCRIPTION - Organic dye of formula (I) comprises five-membered heterocyclic as conjugated unit.    R0=five-membered heterocyclic compound or its derivatives;    R1, R2=aromatic hydrocarbon, heterocyclic aromatic or heterocyclic aromatic derivative;and    R3=H+, NH4+, alkali metal cation, alkaline-earth metal cation, inorganic metal cation, organic monoalkyl and/or multi-alkylamines.    An INDEPENDENT CLAIM is included for a dye sensitization solar battery comprising conductive layer (2), light absorption layer (3), reduction layer (6) and counter electrode (7) orderly connected by middle of two transparent substrate layers (1); light absorption layer formed by semiconductor nanometer particle layer and dye layer; semiconductor nanometer particle layer connected with conductive layer, and dye layer connected with reduction layer. The transparent substrate layer is glass substrate or plastic having polyethylene terephthalate resin, poly disulfonic acid glycol resin, polycarbonate, polypropylene, polyimide, triethylene acyl cellulose and/or polyethersulfone. The conductive layer is formed by indium-tin oxide, fluorine tin oxide, zinc oxide-gallium oxide (ZnO-Ga2O3), ZnO-aluminum oxide (Al2O3), tin-based oxides or zinc oxide. The semiconductor nanometer particles of semiconductor nanometer particle layer is silicon (Si), titanium oxide (TiO2), tin oxide (SnO2), ZnO, tungsten oxide (WO3), niobium oxide (Nb2O5) and titanium oxide doped with strontium (TiSrO3), with average particle diameter of the semiconductor nanometer particles of 1-50 nm. The electrolyte layer is formed by iodine/iodine salt electrolyte, ion liquid and organic hole transporting material and/or inorganic hole transporting material. The ion liquid comprises two parts of anion and cation, the anion is iodine (I-), bromine (Br-), chlorine (Cl-), bis(trifluoromethane sulfone)imide ((N(SO2CF3)2)-), phosphorus hexafluoride ion ((PF6)-), tetrafluoroborate ion ((BF4)-), nitrate ((NO3)-), tricyanomethyl ion ((C(CN)3)-), tetracyanoboron anion ((B(CN)4)-), trifluoroacetate anion ((CF3COO)-), perchlorate anion ((ClO4)-), (trifluoromethyl)trifluoroborate anion ((BF3CF3)-), trifluoromethane sulfonate anion ((CF3SO3)-), perfluoro sulfonate anion ((CF2F2SO3)-), ethanesulfonate ((CH3CH2SO3)-), trifluoromethanesulfonamide (((CF2SO2)2N)-), ethanesulfonamide (((C2H5SO2)2N)-), tris(trifluoromethane sulfonate) carbide (((CF3SO2)3C)-), tris(pentafluoroethane sulfonate) carbide (((C2F5SO2)3C)-), tris(fluorosulfonate) carbide (((FSO2)3C)-), dodecyl sulfate ((CH3CH2OSO3)-), trifluoroacetyl ((CF3COO)-), pentafluoroethane alkoxycarbonyl ((CF3CF2C(O)O)-), propanoyloxy ((CH3CH2C(O)O)-), methanoyloxy ((CH3C(O)O)-); phosphorus tris(ethane) trifluoro anion ((P(C2H5)3F3)-), phosphorus tris(trifluoromethane) trifluoro anion ((P(CF3)3F3)-), phosphorus containing-anion of formulae (P(C2H4H)(CF3)2F3)-, (P(C2F3H2)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-, (P(C6H5)2F4)-, ((CF3)2P(O)O2)2-, and ((CH2O)2P(O)O)-; boron containing-anion of formulae (BF2(C2F5)2)-, (BF3(C2F5))-,(BF2(CN))-, (BF2(CN)2)-, (B(CF3)4)-, (B(OCH3)4)-, (B(OCH3)2(C2H5))-, (B(O2C2H4)2)-, (B(O2C2H2)2)-, and (B(O2CH4)2)-; nitrogen bis(trifluoromethane) ((N(CF3)2)-), aluminum tetrachloride anion ((AlCl4)-) and silicon hexafluoride dianion ((SiF6)2-). The cation is compound of formula (N(R)4)+, (P(R)4)+, (S(R)3)+, R-N(R)-C(N(R)(R))=N+(R)R, or one or more of 5 compounds, e.g. compound of formula (Ia) or (Ib). The organic hole transporting material is tetra di(N,N-di-p-methoxy aniline)-9,9'-spirobifluorene or organic P-type semiconductor. The counter electrode is formed by platinum (Pt), gold (Au), nickel (Ni), copper (Cu), silver (Ag), indium (In), ruthenium (Ru), palladium (Pd), rhodium (Rh), iridium (Ir), osmium (Os), carbon (C) and/or conductive polymer. The conductive polymer is polyaniline, polypyrrole, polythiophene, poly p-phenylene vinylene and/or polyether.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of the dye sensitization solar battery.    Two transparent substrate layers (1)    Conductive layer (2)    Light absorption layer (3)    Reduction layer (6)    Counter electrode (7)