TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Compound: The semiconductor is metal-oxide or metal-sulfide semiconductor.Preferred Process: The semiconductor is spectrally sensitized using compound (A).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compound: The compound (A) is a compound of formulae (2-5) substituted by at least one carboxyl group in a molecule.X,R1,R2=same as defined above;Ar11, Ar12= univalent 5-6 membered aromatic carbocyclic group or heterocyclic group;L11-L15,L21-L25=optionally substituted methine group;m1,m2,n2=0 or 1;n1=0-2;andW1,W2=bivalent group.When n1 is 2, L14 and L15 are used as different repeating units. Preferred Definitions:    X=oxygen atom.    SPECIFIC COMPOUNDS - 69 compounds of naphthalene derivative of formula (1), such as compounds of formulae (called 2a, 12), are disclosed.    EXAMPLE - Nitrogen-containing compound (A-1) of formula (called 2a) was obtained using 4-methyl-2H-chromene-2-thione, pyrazolone derivative, acetone, ethyl acetate, acetic anhydride, 4-diethylamino-2-methyl benzaldehyde and isopropanol, with yield of 24 %. Titanium tetra-isopropoxide (in ml) (62.5), pure water (375) and 70 % aqueous solution (2.65) of nitric acid, were mixed, stirred and heated at 80 degrees C. Titanium-oxide powder (140 g) and pure water (125) were added to the obtained titanium-oxide suspension (800). The obtained suspension was applied on transparent electroconductive glass panel coated with tin oxide doped with fluorine, and baked at 300 degrees C for 16 minutes, to obtain film-like titanium oxide formed on support. A solution which dissolved compound (A-1) (5 g) into methanol solution (200) was prepared. Substrate was dipped into filmy titanium oxide. Trifluoroacetic acid (1 g) was added to the resulting product, subjected to ultrasonic irradiation for 2 hours, washed and vacuum-dried to obtain optoelectric transducer. A solar cell having optoelectric transducer was formed, and had favorable photoelectric conversion efficiency.