NOVELTY - A sensitizing dye comprises cyclobutene derivative (1).    USE - For photoelectric conversion material used for photoelectric conversion electrode of photoelectric conversion cell (all claimed).    ADVANTAGE - The sensitizing dye provides photoelectric conversion material and photoelectric conversion electrode of improved quality. The photoelectric conversion electrode enables the photoelectric conversion cell to have improved photoelectric conversion efficiency and free from exhaustibility.    DETAILED DESCRIPTION - The sensitizing dye comprises cyclobutene derivative of formula (1).    X = 2-40C (un)substituted bivalent aliphatic hydrocarbon forming 5-7 membered ring;    Y = 4-40C (un)substituted bivalent aromatic hydrocarbon or 4-40C (un)substituted bivalent aromatic heterocyclic group;    Z = functional group of formula (2);    R2-R5 = 4-40C (un)substituted aromatic hydrocarbon group, (un)substituted aromatic heterocyclic or 1-40C (un)substituted univalent aliphatic hydrocarbon group, Y, R2 and R3 optionally combine with each other to form a ring;    R6 = 4-40C (un)substituted univalent aromatic hydrocarbon, 4-40C (un)substituted aromatic heterocyclic, 1-40C (un)substituted univalent aliphatic hydrocarbon group or -Y-NR2R3; and    k = 1-3.    R1 = H or electron-attractive group; and    M = H or salt formation positive ion.    INDEPENDENT CLAIMS are included for the following:    (1) photoelectric-conversion material, which is obtained by connecting the sensitizing dye and inorganic semiconductor porous material;    (2) photoelectric-conversion electrode, which is obtained by laminating the photoelectric conversion material on a transparent electrode; and    (3) photoelectric-conversion cell, which has an electrolyte layer, the photoelectric-conversion electrode and an electroconductive counter electrode.    DESCRIPTION OF DRAWING(S) - The figure shows the photoelectric-conversion cell. (Drawing includes non-English language text).    Titanium-oxide porous layer (1)    Electronic-solution layer (2)    Transparent electrode layer (3)    Platinum electrode layer (4)    Glass substrate (5)