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Dye assessment in nanostructured TiO2 sensitized films by microprobe techniques [Poster] 

dc.contributor.authorBarreiros, M. Alexandra
dc.contributor.authorMascarenhas, João
dc.contributor.authorCorregidor, V.
dc.contributor.authorAlves, L. C.
dc.contributor.authorGuimarães, Fernanda
dc.contributor.authorTorres, Erica
dc.contributor.authorBrites, Maria João
dc.date.accessioned2015-01-12T15:21:43Z
dc.date.available2015-01-12T15:21:43Z
dc.date.issued2014
dc.description.abstractDye sensitized solar cells (DSCs) have received considerable attention once this technology offers economic and environmental advantages over conventional photovoltaic (PV) devices. The PV performance of a DSC relies on the characteristics of its photoanode, which typically consists of a nanocrystalline porous TiO2 film, enabled with a large adsorptive surface area. Dye molecules that capture photons from light during device operation are attached to the film nanoparticles. The effective loading of the dye in the TiO2 electrode is of utmost importance for controlling and optimizing solar cell parameters. Relatively few methods are known today for quantitative evaluation of the total dye adsorbed on the film. In this work, a new approach combining microprobe techniques namely, Ion Beam Analytical (IBA) techniques using a micro-ion beam (Rutherford Backscattering Spectrometry (RBS) and Particle Induced X-ray Emission (PIXE)) and Electron Probe Micro-Analysis (EPMA) was carried out to assess dye distribution and depth profile in TiO2 films and the dye load based on Ru/Ti mass ratio. Different 1D nanostructured TiO2 films were prepared, morphologically characterised by SEM, sensitized and analysed by the referred techniques. Dye load evaluation in different TiO2 films by three different techniques (PIXE, RBS and EPMA/ wavelength dispersive spectrometry (WDS)) provided similar results of Ru/Ti mass fraction ratio. Moreover, it was possible to assess dye surface distribution and its depth profile, by means of Ru signal, and to visualise the dye distribution in sample cross-section through X-ray mapping by EPMA/ energy dispersive spectrometry (EDS). PIXE maps of Ru and Ti indicated an homogeneous surface distribution. The assessment of ruthenium depth profile by RBS showed that some films have homogeneous Ru depth distribution while others present different Ru concentration in the top layer (2 ìm thickness). These results are consistent with the EPMA/EDS maps obtained. EPMA (WDS and EDS) together with IBA techniques proved to be powerful tools for functional materials characterisation and provided very promising results in the study of nanostructured TiO2 sensitized films.por
dc.identifier.citationBarreiros, M.A.; Mascarenhas, J.; Corregidor, V.; Alves, L.C.; Guimarães, F.; Torres, E.; Brites, M.J. - Dye assessment in nanostructured TiO2 sensitized films by microprobe techniques. In: Workshop on Nanostructures for Solar Cells, Book of Abstracts, Poster, Braga, Portugal, 2-3 October, 2014, 1 p. por
dc.identifier.urihttp://hdl.handle.net/10400.9/2575
dc.language.isoengpor
dc.subjectSolar cellspor
dc.subjectDyespor
dc.subjectNanostructured materialspor
dc.subjectMicroscopypor
dc.titleDye assessment in nanostructured TiO2 sensitized films by microprobe techniques [Poster] por
dc.typeconference object
dspace.entity.typePublication
oaire.citation.conferencePlaceBraga, Portugalpor
oaire.citation.titleWorkshop on Nanostructures for Solar Cellspor
person.familyNameBarreiros
person.familyNameMascarenhas
person.familyNameGuimarães
person.familyNameBrites
person.givenNameMaria Alexandra
person.givenNameJoão
person.givenNameFernanda
person.givenNameMaria João de Sousa
person.identifierL-4674-2014
person.identifier.ciencia-id271D-7B29-E46C
person.identifier.ciencia-idCF18-4E59-B6B9
person.identifier.ciencia-id6710-13F6-3011
person.identifier.orcid0000-0002-0132-4969
person.identifier.orcid0000-0003-0440-8057
person.identifier.orcid0000-0001-6961-9256
person.identifier.orcid0000-0002-1081-7191
person.identifier.ridL-3318-2014
person.identifier.scopus-author-id6603680496
rcaap.rightsopenAccesspor
rcaap.typeconferenceObjectpor
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relation.isAuthorOfPublication.latestForDiscovery3b1e7d6a-3232-443e-a747-f442427dc57a

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