Measured binding coefficients for iodine and ruthenium dyes; implications for recombination in dye sensitised solar cells

Hdl Handle:
http://hdl.handle.net/10149/596692
Title:
Measured binding coefficients for iodine and ruthenium dyes; implications for recombination in dye sensitised solar cells
Authors:
Li, X. (Xiaoe); Reynal, A. (Anna); Barnes, P. (Piers); Humphry-Baker, R. (Robin); Zakeeruddin, S. M. (Shaik Mohammed); De Angelis, F. (Filippo); O'Regan, B. C. (Brian)
Affiliation:
Teesside University, School of Science & Engineering.
Citation:
Li, X.; Reynal, A.; Barnes, P.; Humphry-Baker, R.; Zakeeruddin, S. M.; DeAngelis, F.; O'Regan, B. C. (2012) 'Measured binding coefficients for iodine and ruthenium dyes; implications for recombination in dye sensitised solar cells' Physical Chemistry Chemical Physics; 14 (44): 15421-15428
Publisher:
Royal Society of Chemistry
Journal:
Physical Chemistry Chemical Physics
Issue Date:
2012
URI:
http://hdl.handle.net/10149/596692
DOI:
10.1039/c2cp43347h
Additional Links:
http://xlink.rsc.org/?DOI=c2cp43347h
Abstract:
We have measured the binding coefficients of iodine to three dyes used in Dye Sensitised Solar Cells (DSSCs). Binding coefficients are quantified via the effect of iodine binding on the UV-vis spectrum of the dye. From iodine titration curves of dye sensitised TiO2 films we find that the binding coefficients of iodine to the dyes C101, N719 and AR24 (vide infra) are in the range of 2000–4000 M−1. From FTIR results and molecular modelling we show the iodine binds to the thiocyanate group in all these dyes. For the AR24 dye we present evidence that iodine also binds to the amine moiety on this dye. With these binding coefficients we show that the dye–iodine complex will be present at much higher concentrations than free iodine in the pore structure of a DSSC. As we have recently shown that iodine (rather than tri-iodide) is the dominant acceptor in electron recombination, the concentration dye–iodine complexes could influence recombination rates and thus Voc. By comparison of recombination data on full cells, we show that AR24 accelerates recombination by a factor of 7 over N719, presumably due to the iodine binding to the amine group. We leave open the question why iodine binding to the amine group seems to have a stronger effect on the recombination than does binding to the thiocyanate.
Type:
Article
Language:
en
ISSN:
1463-9076; 1463-9084
Rights:
Author can archive post-print (ie final draft post-refereeing) after 12 month embargo from acceptance. For full details see http://www.sherpa.ac.uk/romeo [Accessed 19/02/2016]

Full metadata record

DC FieldValue Language
dc.contributor.authorLi, X. (Xiaoe)en
dc.contributor.authorReynal, A. (Anna)en
dc.contributor.authorBarnes, P. (Piers)en
dc.contributor.authorHumphry-Baker, R. (Robin)en
dc.contributor.authorZakeeruddin, S. M. (Shaik Mohammed)en
dc.contributor.authorDe Angelis, F. (Filippo)en
dc.contributor.authorO'Regan, B. C. (Brian)en
dc.date.accessioned2016-02-19T11:21:37Zen
dc.date.available2016-02-19T11:21:37Zen
dc.date.issued2012en
dc.identifier.citationPhysical Chemistry Chemical Physics; 14 (44): 15421-15428en
dc.identifier.issn1463-9076en
dc.identifier.issn1463-9084en
dc.identifier.doi10.1039/c2cp43347hen
dc.identifier.urihttp://hdl.handle.net/10149/596692en
dc.description.abstractWe have measured the binding coefficients of iodine to three dyes used in Dye Sensitised Solar Cells (DSSCs). Binding coefficients are quantified via the effect of iodine binding on the UV-vis spectrum of the dye. From iodine titration curves of dye sensitised TiO2 films we find that the binding coefficients of iodine to the dyes C101, N719 and AR24 (vide infra) are in the range of 2000–4000 M−1. From FTIR results and molecular modelling we show the iodine binds to the thiocyanate group in all these dyes. For the AR24 dye we present evidence that iodine also binds to the amine moiety on this dye. With these binding coefficients we show that the dye–iodine complex will be present at much higher concentrations than free iodine in the pore structure of a DSSC. As we have recently shown that iodine (rather than tri-iodide) is the dominant acceptor in electron recombination, the concentration dye–iodine complexes could influence recombination rates and thus Voc. By comparison of recombination data on full cells, we show that AR24 accelerates recombination by a factor of 7 over N719, presumably due to the iodine binding to the amine group. We leave open the question why iodine binding to the amine group seems to have a stronger effect on the recombination than does binding to the thiocyanate.en
dc.language.isoenen
dc.publisherRoyal Society of Chemistryen
dc.relation.urlhttp://xlink.rsc.org/?DOI=c2cp43347hen
dc.rightsAuthor can archive post-print (ie final draft post-refereeing) after 12 month embargo from acceptance. For full details see http://www.sherpa.ac.uk/romeo [Accessed 19/02/2016]en
dc.titleMeasured binding coefficients for iodine and ruthenium dyes; implications for recombination in dye sensitised solar cellsen
dc.typeArticleen
dc.contributor.departmentTeesside University, School of Science & Engineering.en
dc.identifier.journalPhysical Chemistry Chemical Physicsen
or.citation.harvardLi, X.; Reynal, A.; Barnes, P.; Humphry-Baker, R.; Zakeeruddin, S. M.; DeAngelis, F.; O'Regan, B. C. (2012) 'Measured binding coefficients for iodine and ruthenium dyes; implications for recombination in dye sensitised solar cells' Physical Chemistry Chemical Physics; 14 (44): 15421-15428en
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