Methoxymethyl-substituted quaternary phosphonium ionic liquids as electrolytes for dye-sensitized solar cells

Abstract

Dye-sensitized solar cells based on low-viscosity phosphonium ionic liquids having a methoxymethyl group, triet hyl(methoxymethyl)phosphonium bis(trifluoromethylsulfonyl)amide and triethyl(methoxymethyl)phosphonium di-cyanamide, as their electrolytes have been successfully fabricated. The photo-energy conversion efficiency was optimized up to 5.8% under AM 1.5 full sunlight illumination.