Efficiency enhancement of dye-sensitized solar cells with PAN:CsI:LiI quasi-solid state (gel) electrolytes
Journal article, 2014

While many attempts have been made in the recent past to improve the power conversion efficiencies of dye-sensitized solar cells (DSSCs), only a few reports can be found on the study of these cells using binary iodides in the gel polymer electrolyte. This paper reports the effect of using a binary mixture of (large and small cation) alkaline salts, in particular CsI and LiI, on the efficiency enhancement in DSSCs with gel polymer electrolytes. The electrolyte with the binary mixture of CsI:LiI = 1:1 (by weight) shows the highest ionic conductivity 2.9 x 10(-3) S cm(-1) at 25 A degrees C. DC polarization measurements showed predominantly ionic behavior of the electrolyte. The density of charge carriers and mobility of mobile ions were calculated using a newly developed method. The temperature dependent behavior of the conductivity can be understood as due to an increase of both the density and mobility of charge carriers. The solar cell with only CsI as the iodide salt gave an energy conversion efficiency of similar to 3.9 % while it was similar to 3.6 % for the cell with only LiI. However, the electrolyte containing LiI:CsI with mass ratio 1:1 showed the highest solar cell performance with an energy conversion efficiency of similar to 4.8 % under the irradiation of one Sun highlighting the influence of the mixed cation on the performance of the cell. This is an efficiency enhancement of 23 %.

Charge carrier

Solar cell


Binary iodide mixture

Quasi-solid electrolyte


T M W J Bandara

Chalmers, Applied Physics, Solid State Physics

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

University of Peradeniya

Hdns Fernado

Rajarata University of Sri Lanka

MAKL Dissanayake

University of Peradeniya

L. A. A. De Silva

University of West Georgia

P. S. L. Fernando

Rajarata University of Sri Lanka

Maurizio Furlani

Chalmers, Applied Physics, Solid State Physics

Bengt-Erik Mellander

Chalmers, Applied Physics, Solid State Physics

Journal of Applied Electrochemistry

0021-891X (ISSN) 1572-8838 (eISSN)

Vol. 44 8 917-926

Subject Categories

Chemical Engineering



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