NOVELTY - An optoelectric transducer is formed using oxide semiconductor microparticles sensitized with a methine type pigment.    USE - For solar cell (claimed).    ADVANTAGE - The optoelectric transducer having high conversion efficiency is produced economically.    DETAILED DESCRIPTION - An optoelectric transducer is formed using oxide semiconductor microparticles sensitized with a methine type pigment of formula (1).    n = 0-7;    X,Y = hydrogen atom, aromatic group optionally having substituent, aliphatic-hydrocarbon group, carboxyl group, phosphoric acid group, sulfonic acid group, cyano group optionally having substituent, 1-5C alkyl sulfonyl group optionally having substituent, acyl group, optionally substituted amide group or alkoxycarbonyl group, and X and Y optionally bond and form the ring optionally having substituent;    Z = aromatic group of formula (2) and aromatic group of formula (3);    A1-A3 = hydrogen atom, aromatic group optionally having substituent, aliphatic-hydrocarbon group optionally having substituent, hydroxyl group, phosphoric acid group, cyano group, halogen atom, carboxyl group, carbonamide group, alkoxy group optionally having substituent, aryloxy group, alkoxycarbonyl group, aryl carbonyl group or acyl group;    benzene ring (a) in formula (2) = one to four substituents in formula (2) is selected from halogen atom, amide group, hydroxyl group, cyano group, nitro group, alkoxy group optionally having substituent, acyl group, (un)substituted amino group, aliphatic hydrocarbon group optionally having substituent and aromatic group optionally having substituent, and a ring optionally having substituent is formed when substituents combined with each other, and ring optionally having substituent is formed by bonding the substituent on the benzene ring (a) with A1, A2, and/or A3;    ring Cy in formula (2) = 4-7 membered ring, and hetero atoms other than a carbon atom and the nitrogen atom in formula (2) are included as a ring atom, and the ring optionally has substituent, and when ring Cy has substituents, a ring is formed by arbitrary substituents;    benzene ring (b) in formula (3) = one to three substituents in formula (3) is selected from halogen atom, amide group, hydroxyl group, cyano group, nitro group which may be substituted, alkoxy group optionally having substituent, acyl group, (un)substituted amino group, aliphatic-hydrocarbon group optionally having substituent and aromatic group optionally having substituent and the substituents optionally combined with each other to form the ring optionally having a substituent, and substituents on benzene-ring (b) optionally bonded with A1, A2 or A3, to form ring optionally having substituent;    E in formula (3) = 2-4C (un)saturated hydrocarbon group optionally having substituent, when E has substituents, ring is formed by the arbitrary substituents;and    R1 = aromatic group optionally having substituent, aliphatic-hydrocarbon group optionally having substituent, or acyl group.    A pyrazolone ring is excluded when Z is aromatic group (3). When n is except zero, a ring optionally having substituent is formed with multiple A1, A2, and/or A3. INDEPENDENT CLAIMS are included for the following: (i) a solar cell; and (ii) methine type pigment of formula (1a).    n,R1,E,X,Y,A1-A3, benzene ring (b) = same as defined above.