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Type: Artigo de periódico
Title: A polymer gel electrolyte composed of a poly(ethylene oxide) copolymer and the influence of its composition on the dynamics and performance of dye-sensitized solar cells
Author: Benedetti, JE
Goncalves, AD
Formiga, ALB
De Paoli, MA
Li, X
Durrant, JR
Nogueira, AF
Abstract: A polymer gel electrolyte composed of a poly(ethylene oxide) derivative, poly(ethylene oxide-co-2-(2-methoxyethoxy) ethyl glycidyl ether), mixed with gamma-butyrolactone (GBL), Lit and I(2) is employed in dye sensitized solar cells (DSSC). The electrolyte is characterized by conductivity experiments, Raman spectroscopy and thermal analysis. The influence of the electrolyte composition on the kinetics of DSSC is also investigated by transient absorption spectroscopy (TAS). The electrolyte containing 70 wt.% of GBL and 20 wt.% of Lit presents the highest conductivity (1.9 x 10(-3) S cm(-1)). An efficiency of 4.4% is achieved using this composition. The increase in I(SC) as a function of GBL can be attributed an increase in the mobility of the iodide (polyiodide) species. The increase in the yield of the intermediate species, I(2)(-) originating in the regeneration reaction, is confirmed by TAS. However, the charge recombination process is faster at this composition and a decrease in the V(oc) is observed. Photovoltage decay experiments confirm an acceleration in charge recombination for the DSSC assembled with the electrolyte containing more GBL. Raman investigations show that in this electrolyte the I(5)(-)/I(3)(-) ratio is higher. Theoretical calculations also indicate that the I(5)(-) species is a better electron acceptor. (C) 2009 Elsevier B.V. All rights reserved.
Subject: Gel polymer electrolyte
Dye sensitized solar cells
Polyiodide formation
Transient absorption spectroscopy
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.jpowsour.2009.09.008
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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