TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The dye is adsorbed on the calcinated oxide semiconductor particles before water is adsorbed on the calcinated oxide semiconductor particles. The calcinated oxide semiconductor particles is soaked in a solution containing the dye for 3-48 hours at 25 degrees C to adsorb the dye. Preferred Components: The oxide semiconductor includes titanium oxide. The thickness of the oxide semiconductor electrode is 100-10000 nm. In the photoelectric conversion element, 3-methylpropionitrile solution containing lithium iodide, iodine and 4-(tert-butyl)pyridine is used in the transfer layer. Preferred Definitions:    R2 = phenylene;    A = cyanoacrylic acid or rhodanine-N-acetic acid group; and    a, d = 0.    SPECIFIC COMPOUNDS - The use of 8 compounds (II) is specifically claimed e.g. 2-cyano-3-(4-((2,4-dimethyl-phenyl)-(4-(2,2-diphenyl-vinyl)-phenyl)-amino)-phenyl)-acrylic acid, 3-(4-(biphenyl-4-yl-(4-(4-biphenyl-4-yl-buta-1,3-dienyl)-phenyl)-amino)-phenyl)-2-cyano-acrylic acid, 2-(4-(4-(butyl-(4-(2,2-diphenyl-vinyl)-phenyl)-amino)-benzyl)-cyclohexa-2,5-dienylidene)-propionitrile, 5-(4-((3-acetyl-4-(2,2-diphenyl-vinyl)-2-methyl-phenyl)-(4-(2,2-diphenyl-vinyl)-3-methyl-phenyl)-amino)-phenyl)-2,3,4-tricyano-pent-4-enoic acid and 3-(4-((4-(2-carboxy-2-cyano-vinyl)-phenyl)-(4-(2,2-diphenyl-vinyl)-phenyl)-amino)-phenyl)-2-cyano-acrylic acid of formula (IIa).    EXAMPLE - Titanium oxide paste (a particle diameter of 18 nm) was applied on a glass substrate provided with a fluorine-doped tin oxide (FTO) conductive layer (a FTO coated glass substrate) by a doctor blade method. The paste, after have been dried by heating at 60 degrees C for 10 minutes, was subjected to a calcination treatment at 500 degrees C for 30 minutes, where the titanium oxide thin film having a thickness of 5 mu m was prepared. 3-(4-((4-(2-Carboxy-2-cyano-vinyl)-phenyl)-(4-(2,2-diphenyl-vinyl)-phenyl)-amino)-phenyl)-2-cyano-acrylic acid was dissolved in ethanol to prepare a solution of 3x 10-4 M (mole/liter). The FTO coated glass substrate on which titanium oxide had been applied and calcinated was immersed in the obtained solution for 16 hours at room temperature to perform an adsorption treatment of the dye to obtain an oxide semiconductor electrode. As a charge transfer layer (a liquid electrolyte), 3-methylpropionyltrile solution containing lithium iodide (0.4 M), iodine (0.05 M) and 4-(tert-butyl)pyridine (0.5 M) was utilized. A platinum plate was utilized as a counter electrode, and the oxide semiconductor electrode and a liquid electrolyte were assembled to give photoelectric conversion element.