Ionic relaxation of electrospun nanocomposite polymer-blend quasi-solid electrolyte for high photovoltaic performance of Dye-sensitized solar cells

New quasi-solid electrolytes were developed by blending PVDF-HFP and PMMA with dispersed TiO2 nanopartides as fillers and electrospun as, nanofibrous porous membranes activated in electrolyte solutions with various redox couples. Among them, PVDF-HFP/ PMMA 6 wt% TiO2 with LiI based redox electrolyte have achieved highest conductivity of 2.26 x 10(-2) Scm(-1) and power conversion efficiency (PCE) of 7.081% for its fabricated DSSC. The dynamics of the ionic transport of charge carriers of the developed electrolyte membranes were studied using Random barrier model. The relaxation mechanisms of ionic charge carriers were analysed by Havriliak-Negami formulation. It is inferred that the conductivity is dominated by electrode-polarization and ionic charges exhibit non-debye behaviour in conducing mechanism.