PERFORMANCE ENHANCEMENT FOR DYE-SENSITIZED SOLAR CELLS BY USING IONIC LIQUID-TETHERED GRAPHENE OXIDE-BASED ELECTROLYTES

摘要

Ionic liquid-tethered graphene oxide (IL-GO) are prepared by tethering 1-(3-aminopropyl)-3-methylimi-dazolium bromide on the surface of graphene oxide (GO), and followed by anion-exchange with bis(trifluoromethanesulfonyl)imide ions (TFSI-). Environmental friendly ionic liquid-based composite electrolyte for dye sensitized solar cells (DSSCs) without volatile organic solvents is prepared via dispersion of IL-GO in room temperature ionic liquids, 1-propyl-3-methylimidazolium iodide (PMII). Incorporation of proper amount of IL-GO significantly increased the conductivity of the electrolytes, the open circuit voltage, the short circuit current density and the conversion efficiency of DSSCs. The device which containing 4 wt% of IL-GO composite electrolyte shows an overall power conversion efficiency of 7.04% under simulated AM 1.5 solar spectrum irradiation at 100 mW cm~(-2). These results indicate that the DSSCs based on IL-GO/IL composite electrolytes could overcome the drawbacks of volatile liquid electrolytes, and offer a feasible method to fabricate DSSCs in future practical applications.