TECHNOLOGY FOCUS - ELECTRONICS - Preferred Device: The semiconductor fine particles are titanium oxide particles. Preferred Definitions:    Z, Z' = ring of formula (III):    Y1, Y2 = O, S or C(CN)R'', preferably both are O;    R'' = CN, carboxy, carboxylic ester or carbonamido group;    The ring completed by Q or Q' is an indolenine, thiazoline, oxazole, selenazole, imidazole, 2-quinoline or 4-quinoline, each optionally being fused to a benzene ring.    EXAMPLE - A titanium dioxide dispersion having a titanium dioxide concentration of 11% was prepared in the same manner as described in Barbe, Journal of American Ceramic Society, vol. 80, p. 3157, except that the autoclave temperature was set at 230 degreesC. The dispersed titanium dioxide particles had an average particle size of about 10 nm. To the dispersion was added 30%, based on the titanium dioxide, of polyethylene glycol (molecular weight: 20,000) to prepare a coating composition. Electrically conductive glass having an F-doped (i.e., a fluorine-doped) tin oxide coating was used as a substrate. The titanium dioxide-containing coating composition was applied to the conductor layer side of the glass substrate with a doctor blade to obtain a coating thickness of 140 pm, dried at 25 degreesC for 30 minutes, and then baked in an electric muffle furnace at 450 degreesC for 30 minutes. The electrode layer thus formed had 15 g/m2 of titanium dioxide coated (as a coating amount)and had a thickness of 10 pm. After being cooled out of the furnace, the coated glass substrate was immersed in a 3 x 10-4 mol/l ethanol solution of a dye of formula (IV) for 3 hours. The pickup of the dye was selected appropriately from 0.1 to 10 mmol/m2 according to the dye. The dyed glass substrate was then immersed in 4-t-butylpyridine for 15 minutes, washed with ethanol, and dried spontaneously to obtain a dye-sensitized TiO2 electrode substrate (2 cm by 2 cm). An electrolytic solution was prepared by dissolving iodine and lithium iodide in a 90/10 (by volume) mixed solvent of acetonitrile and N-methyl-2-oxazolidinone in concentrations of 0.05 mol/l and 0.5 mol/l, respectively. The electrode substrate prepared above and a Pt-deposited glass substrate of the same size (2 cm x 2 cm) were brought into contact with the electrode layer and the Pt deposit layer facing each other. The electrolytic solution was introduced into the gap between the glass substrates by making use of capillarity so as to penetrate into the TiO2 electrode. There was thus obtained a photoelectrochemical cell composed of, in sequence, a conductive glass substrate (glass having a conductor layer), a TiO2 electrode, a dye layer, an electrolytic solution, a Pt layer, and glass.