TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Property: The sum total of a Hammett substituent constant (approximatelysp) of R21 is 0.2-1.5.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Semiconductor: The semiconductor is metal oxide or metal sulfide. Preferred Definitions:    L21,L22 = methylene group;    X21,X22,X24,X26 = sulfur atom; and    X23,X25 = oxygen atom.    EXAMPLE - 62.5 ml of titanium tetra-iso propoxide was dropped into 375 ml of pure water for 10 minutes. 2.65 ml of 70% aqueous nitric acid was added to the above mixture and heated at 80degreesC with vigorous stirring for 8 hours. The reaction mixture was concentrated to volume of 200 ml under reduced pressure. 125 ml of pure water and 140 g of titanium oxide powder were added, and titanium oxide suspension was prepared. The suspension was applied on a transparent conductive glass plate coated with tin oxide and doped with fluorine, and baked at 300degreesC for 60 minutes, to form titanium oxide film. A solution formed by dissolving heterocyclic compound of formula (I-1) in methanol was prepared, and support containing the titanium oxide film was dipped in the prepared solution. 1 g of trifluoroacetic acid was further added and ultrasonic irradiation was carried out for 2 hours. The titanium oxide membrane was washed using chloroform, vacuum dried and semiconductor was produced. Tin oxide doped with fluorine was coated as counter electrode. Redox electrolyte formed by dissolving iodine and tetrapropyl ammonium iodide in mixed solvent of acetonitrile and ethylene carbonate was placed between the fluorine doped electrode and the electrode formed by providing platinum to transparent conductive glass plate, and optoelectric transducer was produced. Solar cell was produced using the optoelectric transducer. The solar cell had high photoelectric conversion property. The short circuit current value (Jsc) of the cell when the cell was irradiated with light of intensity 100 mW/m2, was measured to be 3.14 mA, and the release voltage value (Voc) was measured to be 0.562 V.