TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Solvent: The solvent, which is a liquid mixture of 2 or more types of solvent, contains ethylene carbonate and (gamma)-butyrolactone.Preferred Properties: The volume ratio of ethylene carbonate and (gamma)-butyrolactone in the solvent is 1.5:8.5-4.5:5.5.The viscosity of the solvent is 3 cP or less.The porosity of the porous semiconductor layer is preferably 58-70%. EXAMPLE - Titanium isopropoxide (in ml) (125) and 0.1 M nitric acid aqueous solution (750), were mixed, heated and subjected to growth process to obtain colloidal solution containing titanium oxide particle with an average primary particle size of 20 nm. The colloidal solution was concentrated, mixed with ethanol, and centrifuged. The obtained titanium oxide particle was cleaned and dispersed in ethyl cellulose and terpineol. Ethanol was evaporated at 50 degreesC under vacuum of 40 mbar, to obtain titanium oxide paste. The titanium oxide paste was concentrated to obtain final composition containing titanium oxide solid concentration (22 wt.%), ethyl cellulose (11 wt.%) and terpineol (64 wt.%). The obtained final composition was applied to transparent electrically conductive film side consisting of tin oxide (SnO2), which was on transparent substrate. The applied composition was dried and bake-processed to titanium oxide film of thickness 10 microns. The porosity of the obtained film was 58%. The transparent substrate, which comprised the titanium oxide film was put into a pigment solution obtained by dissolving ruthenium pigment (4x10 power -4 mole/l) in ethanol. The solution was boiled for 1 minute and the pigment was adsorbed to the film. Monomer unit of formula (H2C=C(CH3)C(O)O)nA (II) was dissolved in mixed solvent, which had viscosity of 3 cP and contained ethylene carbonate and (gamma)-butyrolactone in a volume ratio of 3:7, to obtain a monomer solution. The monomer solution was mixed with azobis isobutyronitrile (1 wt.%) and heated at 90 degreesC for 80 minutes to obtain gel. The gel was impregnated with oxidation-reduction property electrolyte liquid obtained by dissolving lithium iodide (0.5 mol/l), iodine ( 0.05 mol/l) and iodide-1,2-dimethyl-3-propylimidazole (0.2 mol/l) in the mixed solvent, and heated at 50 degreesC for 1 hour to obtain gel electrolyte. The obtained gel electrolyte was impregnated into the film. An indium-titanium-oxide (ITO) electroconductive substrate, which comprised the platinum film, was mounted on the transparent substrate, and the whole structure was sealed using a sealing agent to obtain pigment sensitizing type solar cell. The obtained cell had high conversion efficiency.    A = central nucleus containing 8 polyoxyethylene groups and 2 polyoxypropylene groups.