TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The dye-sensitized solar cell contains a solvent chosen from cyclic ester, cyclic carbonate, linear carbonate and/or nitrile.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The content of host polymer in gel-form electrolyte is 2-30 mass%.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Compound: The oxidation-reduction pair is iodine, iodine compound, bromine or bromine compound. Preferred Definitions:    R4 = group of formulae (2) or (3); and    R5 = 1-6C alkyl group.    EXAMPLE - A polymer of formula (1) having average degree of polymerization of 1000 was dissolved in gamma-butyrolactone. Lithium iodide and iodine were dissolved in the obtained polymer solution, and tricresyl borate (1 mass%) was added to obtain electrolyte precursor. The precursor was heat-hardened at 70 degrees C for 2 hours, and cross-linked to produce electrolyte film. Titanium oxide particle having average particle diameter of 20 nm was dispersed in a liquid mixture containing water and acetyl acetone with surface-active agent. The obtained slurry liquid was applied on electroconductive glass plate, dried and baked at 500 degrees C for 30 minutes.    A porous titanium oxide film having thickness of 10 micro meters was formed as a semiconductor layer on the substrate consisting of electroconductive glass plate. A sensitizing dye was immersed in ethanol solution, and resulting solution was applied on the formed semiconductor layer. Pigment support processing was performed in semiconductor layer, and refluxed at 80 degrees C. Electrode having semiconductor layer, which supported sensitizing dye was produced. Platinum was vapor-deposited on electroconductive glass plate, and counter electrode was produced.    The obtained electrolyte film was formed on semiconductor layer, and counter electrode was contacted to produce a dye-sensitized solar cell. The obtained solar cell had photoelectric conversion efficiency of 5%, photoelectric conversion efficiency retention of 99 %, and favorable battery characteristics.    R1-R3 = methyl group;    R4 = oxetane-containing group; and    n/m = 0.1.