TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Composition: The photogalvanic cell has an electrolyte layer provided between photoelectric conversion element and counter electrode as electrode. The photogalvanic cell has electrolytic solution containing ionic liquid as main component. Preferred Process: During manufacture of photoelectric conversion element, semiconductor layer containing semiconductor fine particles is formed on electroconductive support.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The semiconductor fine particles are semiconductor fine particles of titanium oxide, zinc oxide and/or tin oxide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general preparation given. Preferred Process: The semiconductor fine particles are sensitized by dinuclear ruthenium complex dye. The ionic liquid includes imidazole derivative of formula (II).Y-=ethyl sulfate, 2-(2-methoxy)ethoxyethyl sulfate or trifluoromethane sulfonate. EXAMPLE - 1.37 g Bis((4,4'-ethoxycarbonyl-2,2'-bipyridine)(chloride))ruthenium(II), 1.09 g silver trifluoromethanesulfonate, and 140 mL dichloroethane were added, stirred, filtered, filtrate was concentrated under reduced pressure, adding diethyl ether to obtained concentrate, stirred, filter cake was washed using diethyl ether and vacuum-dried, to obtain 1.62 g ruthenium complex. 0.142 g Bis(4,4'- di-tert-butyl-2,2'-bipyridine)(chlorine)ruthenium(II), 0.102 g 5,5'-bis(5-methylthiophen-2-yl)-2,2'-bis-benzimidazole and 8 mL ethylene glycol were added, deaerated, refluxed, stirred, water and ethanol were added, cooled, stirred, stirring liquid was suction-filtered, 0.131 g ammonium hexafluorophosphate was added to filtrate, stirred at room temperature for 1 hour, and deposit in stirring liquid was filtered, to obtain ruthenium complex (R2). 0.2 g Obtained ruthenium complex (R2) and 24 mL 28% methanol solution of sodium methoxide and N,N-dimethylformamide were added, stirred at room temperature for 5 minutes, 0.2 g 2.98 g bis((4,4'-ethoxycarbonyl-2,2'-bipyridine)(chloride))ruthenium(II) and 24 mL N,N-dimethylformamide were added, deaerated, refluxed, stirred, reaction liquid was cooled, concentrated under reduced pressure, 48 mL 0.2 mol/L sodium hydroxide aqueous solution was added, heat-stirred, cooled, filtered, 30 ml methanol and 110 mL water were added to filter cake, 0.7 mL 0.79 mol/L hydroiodic acid aqueous solution was added, produced precipitation was filtered, 70 mL water and 0.8 mL 0.2 mol/L sodium hydroxide aqueous solution were added, vacuum-drying, 0.4 mL 0.79 mol/L hydroiodic acid aqueous solution was added, precipitation was produced, filtered, and washed using 0.79 mmol/L hydroiodic acid aqueous solution, to obtain 0.097 g dinuclear ruthenium complex dye.