TECHNOLOGY FOCUS - CERAMICS AND GLASS - Preferred Materials: The sensitized solar cell comprises a semiconductor based on silicon (Si), titanium oxide (TiO2), tin oxide (SnO2), iron oxide (Fe2O3), tungsten oxide (WO3), zinc oxide (ZnO), niobium oxide (Nb2O5), cadmium sulfide (CdS), zinc sulfide (ZnS), lead sulfide (PbS), bismuth sulfide (Bi2S3), cadmium selenide (CdSe), gallium phosphide (GaP), indium phosphide (InP), gallium arsenide (GaAs), cadmium telluride (CdTe), copper indium sulfide (CuInS2), and/or copper indium selenide (CuInSe2).    TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: The device, which may be a sensitized solar cell, comprises a semiconductor, the electrolyte and a counter electrode.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Materials: The electrolyte comprises a further ionic liquid with iodide as an anion and compound(s) containing a nitrogen atom having non-shared electron pairs. The anion is a halide ion, a polyhalide ion, a complex anion containing halide ion(s) CF3SO3-, CF3COO-, (CF3SO2)3C-, NO3-, PF6, BF4-, -N(CN)2, C(CN)3, NCS-, RSO3-, or R1SO4-.R1=H or linear or branched 1-20C alkyl or alkoxy.Preferred Composition: The electrolyte comprises less than 50 vol.% organic solvent and 10-80 vol.% ionic liquid of formula Kt+(B(CN)4)-. Preferred Definitions:    Kt-=N(C2H5)4+, N(C4H9)4+, P(C2H5)4+, P(C4H9)4+, P(C6H13)3(C14H29)+, or one or more of 10 nitrogen-containing anions, e.g. structure (I).    EXAMPLE - A binary ionic liquid electrolyte was composed of 0.1 M iodine (I2), 0.5 M N-methylbenzylimidazole (NMBI) and 0.1 M guanidinium thiocyanate (GuNCS) in a mixture of 1-methyl-3-propylimidazolium iodine (PMII) and 1-ethyl-3-methylimidazolium tetracyanoborate in a volume ratio of 13:7. The electrolyte comprising tetracyanoborate and an organic cation had good electrolyte properties and comparatively high diffusion coefficients for iodide and triiodide, with respect to another binary ionic liquid electrolyte composed of 0.2 M I2, 0.5 M NMBI and 0.1 M GuNCS in PMII.