Gelation of ionic liquid with exfoliated montmorillonite nanoplatelets and its application for quasi-solid-state dye-sensitized solar cells

► The exfoliated montmorillonite (exMMT) is a two-dimensional electrolyte with negative charge. ► The exMMT was able to gel the PMII-based electrolyte system for DSSC. ► The PCE of DSSC was increased from 6.58% to 7.77% at full sun after gelled by exMMT.