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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

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Autor(es):
Benedetti, Joao E. [1] ; Goncalves, Agnaldo D. [1] ; Formiga, Andre L. B. [1] ; De Paoli, Marco-A. [1] ; Li, X. [2] ; Durrant, James R. [2] ; Nogueira, Ana F. [1]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Univ Campinas UNICAMP, Inst Chem, BR-13083970 Campinas, SP - Brazil
[2] Univ London Imperial Coll Sci Technol & Med, Ctr Elect Mat & Devices, London SW7 2AY - England
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Journal of Power Sources; v. 195, n. 4, SI, p. 1246-1255, FEB 15 2010.
Citações Web of Science: 69
Resumo

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. (AU)

Processo FAPESP: 08/51001-9 - Células solares híbridas e fotoeletroquímicas baseadas em nanopartículas e nanorods de ZnO e ZnO:Ga
Beneficiário:Agnaldo de Souza Gonçalves
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 06/58998-3 - Preparação, caracterização e aplicação de eletrólitos poliméricos gel em células solares TiO2/corante
Beneficiário:João Eduardo Benedetti
Linha de fomento: Bolsas no Brasil - Doutorado