TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The optoelectric transducer is preferably obtained by using oxide semiconductor microparticles sensitized by combined use of 2 or more types of pigments such as organic dye containing methine group pigment, and organic dye containing another metal complex pigment having another structure.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The oxide semiconductor microparticles contain titanium dioxide as an essential component. Preferred Function: Oxide semiconductor particles support pigment in the presence of inclusion compound. Preferred Definitions:    Y = formula (2);    R1 = aliphatic hydrocarbon residue or aromatic hydrocarbon residue having carboxyl group; and    n = 0-3.    Z = substituent; and    R2,R3 = optionally substituted heterocyclic residue, optionally substituted aromatic hydrocarbon residue or optionally substituted aliphatic hydrocarbon residue.    When Z is more than 1, Z optionally combine to form a ring optionally having R2,R3 and substituent.    EXAMPLE - Rhodanine-3-acetic acid (in mass parts) (1.2) and 4-dimethylamino benzaldehyde (1) were mixed with ethanol (10), and piperazine anhydride (0.1) was added and reacted at reflux for 2 hours. The obtained solid was cooled, filtered, washed and dried. Subsequently, by ethanol after recrystallization, it was filtered, washed and dried to obtain compound (1) represented by formula (5).    n = 0;    X1 = 0;    X2,X3 = sulfur;    R1 = CH2COOH;    R2,R3 = CH3; and    R4,R5 = H.    The compound (1) and compound (93) represented by formula (13) were dissolved in ethanol to form pigment solution with concentration of 1.5x10-4 M. Porous substrate, which was processed with nitric acid aqueous solution containing titanium dioxide, was immersed overnight into the pigment solution at room temperature such that the pigment is supported on the substrate. Solvent was then washed off and the substrate was dried. Optoelectric transducer of semiconductor thin film, which carried out pigment sensitizing, was obtained. Using the optoelectric transducer, a solar cell having short circuit current of 11.9 mA/cm2, releasing voltage of 0.69 V and conversion efficiency of 4.7%, was obtained.