TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Pigment: The methine group pigment is preferably of formula (6), and has carboxyl, hydroxyl, sulfo, phosphoric acid, amide and/or mercapto group in a molecule.A1,A2,X,n = same as defined above.Preferred Process: The oxide semiconductor is sensitized with metal complex, methine group pigment and compound containing organic dye having structure different from that of methine group pigment. The pigment is supported on oxide semiconductor microparticles in presence of an inclusion compound, and formed into a thin film, which is used for solar cell.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Particle: The oxide semiconductor microparticles comprises titanium dioxide has an essential component. Preferred Definitions:    Ar = optionally substituted aromatic hydrocarbon ring, preferably benzene ring or optionally substituted naphthalene ring;    n = 1-3; and    X = group of formula (2), preferably optionally substituted heterocyclic residue.    Z = substituent;and    R3,R4 = optionally substituted heterocyclic residue, optionally substituted aromatic hydrocarbon residue, and aliphatic hydrocarbon residue optionally having H or substituent, R3 and R4 mutually couples to form optionally substituted ring.    EXAMPLE - Pigment of formula (4) was prepared using 2-methyl-3-hydroxy-4-carboxy quinaldine (in mass parts) (2), 4-N,N-dimethylamino benzaldehyde (1.6), ethanol (20), and piperazine anhydride (0.1). The pigment having maximum absorption wavelength of 537 nm, and cholic acid (inclusion compound) were dissolved in ethanol, to obtain solution (A) having concentration of 3x10-4M. A porous substrate formed by immersing semiconductor thin film electrode in 0.2M titanium tetrachloride aqueous solution, was immersed in solution (A) at room temperature for overnight, and pigment was supported. The supported substrate was washed using solvent, and dried to obtain optoelectric transducer consisting of pigment sensitized semiconductor thin film. The optoelectric transducer had short circuit current of 12 mA/cm2, releasing voltage of 0.55 V and conversion efficiency of 3.6%.