TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The oxide semiconductor thin film contains titanium dioxide, zinc oxide or stannic oxide. The oxide semiconductor fine particles are sensitized in presence of inclusion compound.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compound: The photoelectric transducer further contains methine dye. Preferred Definitions:    M=ruthenium;    X1,X2=carboxyl or its salts;    Y'1,Y'2=isothiocyanate (-NCS);    n1,n2=1;    R1-R4=optionally substituted aliphatic hydrocarbon residue, 4-18C saturated alkyl, n-butyl, phenyl, 9,9-di-(1-12C alkyl) fluorene, 1-18C alkyl or 1-6C alkyl, preferably 1-8C alkyl;and    A1-A4=H, 1-4C alkyl or 1-4C dialkyl amino phenyl, preferably H.    The ring formed by A1 and A2, and ring formed by A3 and A4 is thiophene ring and substituted by 1-8C alkyl, the ring formed by A1 and A2 with benzene-ring a1, and ring formed by A3 and A4 with benzene-ring a2 is dihydropyrane ring and substituted by carbonyl and the ring formed by R1 and R2 with benzene-ring a1, and ring formed by R3 and R4 with benzene-ring a2 is piperidine ring or pyrrolidine ring and substituted by 1-4C alkyl.    EXAMPLE - Dichloro (p-cymene) ruthenium (II) dimer (in mass parts) (0.1), bipyridinyl compound of formula (II) (0.2) and sufficient amount of dimethyl formamide were added and stirred at 60 degrees C for 4 hours. Then, 4,4'-dicarboxy 2,2'-bipyridine (0.08) and ammonium thiocyanate (0.76) were added, stirred at 140 degrees C for 4 hours and cooled to 25 degrees C to obtain reaction liquid. The obtained reaction liquid was filtered and distilled to obtain black crystals. The obtained black crystals as metal complex pigment were dissolved in ethanol to obtain reaction mixture. Further, porous semiconductor was immersed in reaction mixture at room temperature for 12 hours, washed and dried to obtain photoelectric transducer. The photoelectric transducer used in solar cells. The solar cell has excellent efficiency, stability and economically manufactured.