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dc.contributor.authorGonzález Pedro, Victoria
dc.contributor.authorShen, Qing
dc.contributor.authorJovanovski, Vasko
dc.contributor.authorGimenez, Sixto
dc.contributor.authorTena-Zaera, Ramón
dc.contributor.authortoyoda, taro
dc.contributor.authorMora-Sero, Ivan
dc.date.accessioned2014-05-06T18:36:13Z
dc.date.available2014-05-06T18:36:13Z
dc.date.issued2013
dc.identifier.issn0013-4686
dc.identifier.urihttp://hdl.handle.net/10234/91501
dc.description.abstractCombination of inorganic quantum dots (QDs) and organic/metallorganic dyes as supracollectors nanocomposites could have an important role on the development of efficient photovoltaic devices based on the synergistic action of the hybrid-sensitizers. Here we have analyzed the combination of CdSe QDs and polypyridil N719 ruthenium dye. By ultrafast transient grating measurements we show that the cascading structure (type II) of this system takes full advantage to augment electron injection and hole regeneration efficiencies. Co-sensitized TiO2 electrodes lead to an improvement in charge separation, increasing the number of injected electrons from the CdSe QDs to the TiO2 as a consequence of the suppression of back reaction, by fast regeneration of holes by the dye action. The potentiality of this supracollector system has been verified in a complete cell configuration. Sulfide/polysulfide based ionic liquid in which both sensitizers (QD and dye) are stable has been employed as hole conducting media. In spite of the limited efficiencies of the analyzed cells, the higher photocurrents measured for CdSe/N719 co-sensitization compared to the cells sensitized using a single sensitizer constitutes a valid proof of the concept. Impedance spectroscopy unveiled the recombination limitation of the analyzed cells. On the other hand, ionic liquid exhibits an enhanced cell stability maintaining cell efficiency after one week and keeping it at 80% after 21 days. The reported results highlight a huge potential of the synergetic combination of QD and dyes for improving solar cell performance and of novel sulfide/polysulfide ionic liquid-based electrolytes for enhancing long term stability and sustainability of QD sensitizers.ca_CA
dc.format.extent23 p.ca_CA
dc.format.mimetypeapplication/pdfca_CA
dc.language.isoengca_CA
dc.publisherElsevierca_CA
dc.relation.isPartOfElectrochimica Acta, 2013, vol. 100ca_CA
dc.rightsCopyright © 2013 Elsevier Ltd. All rights reserved.ca_CA
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/*
dc.subjectQuantum dot sensitized solar cellsca_CA
dc.subjectIonic liquidca_CA
dc.subjectTiO2ca_CA
dc.subjectCdSeca_CA
dc.subjectDyeca_CA
dc.titleUltrafast characterization of the electron injection from CdSe quantum dots and dye N719 co-sensitizers into TiO2 using sulfide based ionic liquid for enhanced long term stabilityca_CA
dc.typeinfo:eu-repo/semantics/articleca_CA
dc.identifier.doihttp://dx.doi.org/10.1016/j.electacta.2013.03.119
dc.rights.accessRightsinfo:eu-repo/semantics/openAccessca_CA
dc.relation.publisherVersionhttp://www.sciencedirect.com/science/article/pii/S0013468613005318ca_CA
dc.type.versioninfo:eu-repo/semantics/submittedVersion


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