Effect of ionic liquid concentration on the photovoltaic performance of dye-sensitized solar cell

Abstract

Quasi-solid-state electrolytes based on poly(vinylidene fluoride-co-hexafluoropropylene) (PVdf-HFP), propylene carbonate (PC), 1,2-dimethoxyethane (DME) and different concentrations of 1-methyl-3-propylimidazolium iodide (MPII) salt were prepared. The highest room temperature conductivity of 4.6 x 10(-3) S cm(-1) was achieved with 1.0M MPII. The effect of MPII on the conductivity was discussed on the basis of number free ions. The number of free ions were estimated by impedance spectroscopy method. DSSC at 1.0M MPII shows the conversion efficiency, eta of 3.70% with short-circuit current density, J(sc) of 8.65 mA cm(-2), open circuit voltage, V-oc of 641 mV and a fill factor, FF of 66%. (C) 2019 Elsevier Ltd. All rights reserved.