NOVELTY - Substituted 9H-fluorene dye compounds (I) are new.    USE - (I) are useful for dye-sensitized solar cell (claimed) and a photoelectric component.    ADVANTAGE - (I): has high molar absorption coefficient, so that it improves the photoelectric conversion efficiency of the dye-sensitized solar cell; is synthesized with less steps which is easy to control and less expensive; and resists the moisture or gas from outsides by the transparent substrate in the dye-sensitized solar cell.    DETAILED DESCRIPTION - Substituted 9H-fluorene dye compounds of formula (I) and their salts are new.    R1-R4, R16,-R18 = H, 1-12C alkyl, 1-12C alkoxy or halo;    n = 1-3; either    D1-D2 = 1-12C alkyl, substituted 9H-fluoren-2-yl moiety of formula (II), substituted 9H-carbazol-2-yl moiety of formula (III), substituted 10,11-dihydro-5H-dibenzo(b,f)azepin-2-yl moiety of formula (IV) or substituted 10H-phenothiazin-3-yl moiety of formula (V); or    D1D2N = pyrrolidine, piperidine or azepane;    R5-R8, R10, R11, R13, R14 = H, 1-12C alkyl, 1-12C alkoxy, amino or halo;    R9, R12, R15, R19,-R22 = H or 1-12C alkyl;    B1 = substituted phenylene-1,4-diyl moiety of formula (VI), substituted pyridin-1,6-diyl moiety of formula (VII), substituted fused heterocyclic phenylene moiety of formula (VIII), substituted heterocyclopenta-2,4-dien-1,5-diyl moiety of formula (IX), substituted 2,3-dihydro-thieno(3,4-b)(1,4)dioxin-5,7-diyl moiety of formula (X), substituted heterocyclopentadien-diyl moiety of formula (XI), substituted 9H-carbazol-3,6-diyl moiety of formula (XII); and    Z = O, S or Se.    INDEPENDENT CLAIMS are also included for:    (1) the dye-sensitized solar cell, comprising, a photoanode comprising (I), a cathode and an electrolyte layer disposed between the photoanode and the cathode; and    (2) a dye solution comprising (I) (0.01-1 wt.%) and an organic solvent (99.99-99 wt.%), where the organic solvent is acetonitrile, methanol, ethanol, propanol, butanol, dimethyl formamide or N-methyl-2-pyrrolidinone.