Effect of iodine concentration on the photovoltaic properties of dye sensitized solar cells for various I-2/LiI ratios

Mathew, Ambily and Anand, Venu and Rao, Mohan G and Munichandraiah, N (2012) Effect of iodine concentration on the photovoltaic properties of dye sensitized solar cells for various I-2/LiI ratios. In: ELECTROCHIMICA ACTA, 87 . pp. 92-96.

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Abstract

In the present study, the effect of iodine concentration on the photovoltaic properties of dye sensitized solar cells (DSSC) based on TiO2 nanoparticles for three different ratios of lithium iodide (LiI) and iodine (I-2) has been investigated. The electron transport properties and interfacial recombination kinetics have been evaluated by electrochemical impedance spectroscopy (EIS). It is found that increasing the concentration of lithium iodide for all ratios of iodine and lithium iodide decreases the open-circuit voltage (V-oc) whereas short circuit current density (J(sc)) and fill factor (FF) shows improvement. The reduction in V-oc and increment in J(sc) is ascribed to the higher concentration of absorptive Li+ cations which shifts the conduction band edge of TiO2 positively. The increase in FF is due to the reduction in electron transport resistance (R-omega) of the cell. In addition for all the ratios of LiI/I-2 increasing the concentration of I-2 decreases the V-oc which is attributed to the increased recombination with tri-iodide ions (I-3(-)) as verified from the low recombination resistance (R-k) and electron lifetime (tau) values obtained by EIS analysis. (C) 2012 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	ELECTROCHIMICA ACTA
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copyright for this article belongs to PERGAMON-ELSEVIER SCIENCE LTD, ENGLAND
Keywords:	Dye sensitized solar cell;Electrolyte;Electrochemical impedance spectroscopy;Fill factor;Efficiency
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	22 Mar 2013 12:12
Last Modified:	22 Mar 2013 12:12
URI:	http://eprints.iisc.ac.in/id/eprint/46176

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