NOVELTY - Photoelectric conversion element comprises a substrate (1), a first electrode (2), a photoelectric conversion layer containing a semiconductor (5) and a sensitizing dye (4), and a hole transport layer, and a second electrode.    USE - The photoelectric conversion element is useful in a solar cell (claimed).    ADVANTAGE - The photoelectric conversion element has excellent photoelectric conversion efficiency, stability, reproducibility in cooperation with stability of titanium oxide, and is prepared in a cost-effective manner.    DETAILED DESCRIPTION - Photoelectric conversion element comprises a substrate (1), a first electrode (2), a photoelectric conversion layer containing a semiconductor (5) and a sensitizing dye (4), and a hole transport layer, and a second electrode, where the hole transport layer comprises a polymer having repeating units of formula (I) or (II), and the sensitizing dye has a structure of formulae (IA)-(IC).    R1-R4 = H (preferred), 1-24C alkyl, 3-9C cycloalkyl, 1-18C alkoxy, 2-18C polyethylene oxide or aryl group, provided that at least one of R1-R4 is a 1-24C alkyl, 3-9C cycloalkyl, 1-18C alkoxy, 2-18C polyethylene oxide or aryl group, and the remaining substituents are H;    R5 = halo, 1-24C alkyl or 1-18C alkoxy;    n = 1-3;    m = 0-2n+4; either    Ar1-Ar3, Ar4-Ar7, Ar9, Ar10 = aromatic group; or    R6 = 1-24C alkyl or 3-9C cycloalkyl; or    any two of Ar1-Ar3, Ar4Ar5, Ar6Ar7, Ar9+Ar10, Ar9+Ar6 or Ar10+R6 = ring structure;    Ar8 = a divalent aromatic group;    Z1 = group having an acidic group and an electron-attracting group or a group having an acidic group and an electron-attracting ring structure, which is substituted in any of Ar1-Ara;    p = 1-3;    Z2 = group having an acidic group and an electron-attracting group or a group having an acidic group and an electron-attracting ring structure, which is substituted in any of Ar4-Ar7;    q = 1-4;    Z3 = group having an acidic group and an electron-attracting group or a group having an acidic group and an electron-attracting ring structure, which is substituted in any of Ar9, Ar10 and R6, where the acidic group in Z1-Z3 is a carboxyl group, sulfo group, phosphonic acid group (all preferred) or hydroxy group, the electron-attracting group in Z1-Z3 is a cyano group or nitro group (both preferred), fluoro group or chloro group and the electron-attracting ring structure in Z1-Z3 is rhodanine ring, dirhodanine ring, imidazolone ring or pyrazoline ring (all preferred), quinone ring or thiadiazole ring; and    r = 1-2.    An INDEPENDENT CLAIM is included for producing the photoelectric conversion element, comprises a substrate, a first electrode, a photoelectric conversion layer containing a semiconductor and a sensitizing dye, a hole transport layer, and a second electrode, where the hole transport layer is formed by electrolytic polymerization using a monomer of formula (III) or a monomer (IV) or its multimer.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of photoelectric conversion element.    Substrate (1)    First electrode (2)    Barrier layer (3)    Sensitizing dye (4)    Semiconductor. (5)