Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/72376
Type: Artigo de periódico
Title: The role of gel electrolyte composition in the kinetics and performance of dye-sensitized solar cells
Author: de Freitas, JN
Goncalves, AD
de Paoli, MA
Durrant, JR
Nogueira, AF
Abstract: Gel-type polymer electrolytes based on the copolymer poly(ethylene oxide-co-epichlorohydrin) and the plasticizer gamma-butyrolactone (GBL) were optimized and applied in dye-sensitized solar cells. The plasticizer added to the electrolyte allowed the dissolution of a higher concentration of salt, reaching conductivity values close to 1 mS cm(-1) for the sample prepared with 30 wt% of LiI. Raman spectroscopy confirmed polyiodide formation in the electrolyte when the salt concentration exceeds 7.5 wt%, introducing a significant contribution of electronic conductivity in the electrolyte. The devices were characterized under AM 1.5 conditions and the I-V curves were fitted using a two diode equation. Increasing the concentration of LiI-I-2 accelerates dye cation regeneration as measured by transient absorption spectroscopy; however, it also contributes to an increase in the dark current of the cell by one order of magnitude. The best performance was achieved for the solar cell prepared with the electrolyte containing 20wt% of LiI, with efficiencies of 3.26% and 3.49% at 100 and 10 mW cm(-2) of irradiation, respectively. (C) 2008 Elsevier Ltd. All rights reserved.
Subject: dye-sensitized solar cells
DSSC
polymer electrolyte
gel electrolyte
polyiodide
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Rights: fechado
Identifier DOI: 10.1016/j.electacta.2008.05.009
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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