NOVELTY - A dye compound comprising a ligand-containing complex is new.    USE - A dye compound for photovoltaic cell (e.g. dye-sensitized solar cell) for a module (claimed).    ADVANTAGE - The compound has relatively high molar extinction coefficients across the visible light spectrum and high absorption at specified wavelength range. A dye-sensitized solar cell containing the compounds has improved efficiency.    DETAILED DESCRIPTION - A dye compound comprising a complex of formula MX3L of MXY'L is new.    M=transition metal ione;    X=monodentate ligand such as thiocyanate, isothiocyanate, or pyridine optionally substituted with halo, 1-20C alkoxy, 1-20C alkyl, 2-20C alkenyl, 2-20C alkynyl, 3-20C cycloalkyl, 3-20C cycloalkenyl, 1-20C heterocycloalkyl, 1-20C heterocycloalkenyl, aryl or heteroaryl;    L=tridentate ligand of formula (II);    at least one of R1-R11=alkenylaryl, akynylaryl, heteroaryl, alkenylheteroaryl or alkynylheteroaryl; and each of the others of R1-R11 is H, COOH, PO3H, halo, 1-20C alkoxy, 1-20C alkyl, 2-20C alkenyl, 2-20C alkynyl, 3-20C cycloalkyl, 3-20C cycloalkenyl, 1-20C heterocycloalkyl, 1-20C heterocycloalkenyl, aryl, heteroaryl, alkenylaryl, alkynylaryl, alkenylheteroaryl or alkynylheteroaryl; and    Y'=didentate ligand such as 1,10-phenanthroline or 2,2'-bipyridine optionally substituted with halo, 1-2C alkoxy, 1-20C alkyl, 2-20C alkenyl, 2-20C alkynyl, 3-20C cycloalkyl, 3-20C cycloalkenyl, 1-20C heterocycloalkyl, 1-20C heterocycloalkenyl, aryl, or heteroaryl.    INDEPENDENT CLAIMS are included for:    (1) a photovoltaic cell comprising two electrodes (101, 111), and photoactive layer (150) between the two electrodes, where the photoactive layer comprises the dye compound; and    (2) a module comprising photovoltaic cells which are electrically connected.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of the photovoltaic cell.    Electrodes (101, 111)    Conductive layer (120)    Photoactive layer (150)    Substrate (170)    Electrical load (180)