NOVELTY - Photoelectric conversion device (I) comprises semiconductor particles (21) sensitized by a metal complex dye (22) (A).    USE - (I) is useful in photo-electrochemical cell (claimed) and solar cell.    ADVANTAGE - (I) has a high stability to heat and light, and can efficiently sensitize semiconductor particles. (I) exhibits excellent photoelectric conversion efficiency. (A) has a high absorbancy at a large wave range.    DETAILED DESCRIPTION - Photoelectric conversion device (I) comprises semiconductor particles (21) sensitized by a metal complex dye (22) of formula (M2(LL2)m3(LL3)m4(X2)m5.C2) (A).    M2 = Ru;    LL2 = bidentate ligand of formula (III);    Z1a, Z1b, Z1c = nonmetallic atoms forming a 5- or 6-membered ring;    a = 0;    LL3 = bidentate ligand of formula (IV);    R1, R2 = carboxyl, sulfonic acid, OH, hydroxamic acid, phosphoryl or phosphonyl; either    R3, R4 = substituent; or    R3R4 = ring when c1 is 1 and c2 is 1 or more;    b1 = 0-4;    b2 = 1 or 2;    c1 = 0 or 1;    c2 = 0-5;    X2 = monodentate or bidentate ligand which coordinates to M2 via one or two groups comprising acyloxy, acylthio, acylaminooxy, thioacyloxy, thioacylthio, thiocarbonate, dithiocarbonate, trithiocarbonate, alkylthio, arylthio, alkoxy, aryloxy, thiocarbamate, dithiocarbamate, acyl, thiocyanate, isothiocyanate, cyanate, isocyanate or CN, or a monodentate or bidentate ligand comprising ketones, carbonamides, thiocarbonamides, thioureas, isothioureas, halo or carbonyl;    m3 = 0-2;    m4 = 1-3;    m5 = 0-3, where X2 may be the same or different ligands that may be bonded together when m5 is 2 or 3; and    C2 = counter ion optionally contained to neutralize charge of the metal complex dye.    DESCRIPTION OF DRAWING(S) - The figure shows a partial cross sectional view showing a preferable structure of a photoelectric conversion device.    Electrically conductive layer (10)    Photosensitive layer (20)    Semiconductor particles (21)    Metal complex dye (22)    Charge transfer layer. (30)