TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The semiconductor comprises a titanium oxide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The dye has an imidazolone moiety and comprises ruthenium. The charge transport layer comprises a thiophene derivative. Preferred Method: The semiconductor is subjected to a surface treatment using an organic base. The charge transport layer is formed via polymerization. Preferred Definitions:    X, Y1, Z1 = I, CN, -COR3, -COOR4 or -CONR5R6; and    R3-R6, = substituted alkyl.    EXAMPLE - Titanium oxide paste was coated onto a fluorine-doped tin oxide conductive glass substrate by a screen printing method. The coating and drying (at 120 degrees C for 3 minutes) each were made three times. Then, the paste was heated at 200 degrees C for 10 minutes and subsequently calcinated at 500 degrees C for 15 minutes to obtain a titanium oxide thin film having a thickness of 5 mu m. 2-((Z)-4-((5-((2,4-dimethylphenyl)(4-((E)-2-(3,4-dimethylphenyl)-2-phenylvinyl)phenyl)amino)thiophen-2-yl)methylene)-5-oxo-4,5-dihydro-1H-imidazol-2-ylthio)acetic acid (5059 mA/cm2) was dissolved in a mixed solvent of acetonitrile and tert-butyl alcohol (1:1) to prepare a 5x 10-4 mol/l of dye solution. The fluorine-doped tin oxide glass substrate on which titanium oxide paste was coated and heated was immersed in this solution at room temperature for 3 hours to prepare an oxide semiconductor electrode. The above semiconductor electrode was immersed in an acetonitrile solution which contained bis-3,4-ethylenedioxythiophene (EDOT) (1x 10-3 mole/l) which was a dimer of EDOT and lithium bis(trifluoromethanesulfonyl)imide (0.1 mole/l). A charge transport layer which was a conductive polymer containing an EDOT monomer unit was formed on the semiconductor electrode surface. The obtained semiconductor electrode/charge transport layer was washed with acetonitrile and then dried. Then, the semiconductor electrode/charge transport layer was immersed in an acetonitrile solution containing lithium bis(trifluoromethanesulfonyl)imide (15 mM(mmol/l)) and 4-chloropyridine (50 mM) for 30 minutes. Then, after the semiconductor electrode/charge transport layer was naturally dried, gold film (910 nm) was vacuum evaporated to obtain photoelectric conversion element.