Quasi solid state polymer electrolyte with binary iodide salts for photo-electrochemical solar cells
Journal article, 2014

Quasi-solid-state polymer electrolytes can be used in dye sensitized solar cells (DSSCs) in order to overcome various problems associated with liquid electrolytes. Prior to fabricating commercially viable solar cells, the efficiency of quasi solid state DSSCs needs to be improved. Using electrolytes with a binary iodide mixture is a novel technique used to obtain such efficiency enhancement. In this work we report both conductivity and solar cell performance enhancements due to incorporation of a mixture containing LiI and tetrahexylammonium iodide in a quasi-solid-state electrolyte. The conductivity of the electrolyte increases with added amounts of Lit and thus the highest conductivity, 3.15 x 10(-3) S cm(-2) at 25 degrees C, is obtained for the electrolyte 100 wt% LiI. The predominantly ionic behavior of the electrolytes was established from dc polarization measurements. The iodide ion conductivity, measured using iodine pellet electrodes decreased somewhat with increasing amount of LiI even though the overall conductivity increased. However, the highest efficiency was obtained for the DSSC containing a polymer electrolyte with Hex(4)N(+)I:LiI = 1:2 mass ratio. This cell had the largest short circuit current density of about 13 mA cm(-2) and more than 4% overall energy conversion efficiency. The results thus show that electrolytes with Hex(4)N(+)I/LiI mixed iodide system show better DSSC performance than single iodide systems. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.


Cation effect


Quasi-solid electrolytes

Dye sensitized solar cells



Polymer electrolyte




T M W J Bandara

Chalmers, Applied Physics, Solid State Physics

W. J. M. J. S. R. Jayasundara

University of Peradeniya

MAKL Dissanayake

National Institute of Fundamental Studies

Hdns Fernando

University of Colombo

Maurizio Furlani

Chalmers, Applied Physics, Solid State Physics

Ingvar Albinsson

University of Gothenburg

Bengt-Erik Mellander

Chalmers, Applied Physics, Nuclear Engineering

International Journal of Hydrogen Energy

0360-3199 (ISSN)

Vol. 39 6 2997-3004

Driving Forces

Sustainable development

Subject Categories

Physical Sciences

Areas of Advance


Materials Science



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