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Microscopy techniques for dye distribution in DSCs nanocrystalline TiO2 films 

2015Journal article Open access
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dc.contributor.authorBarreiros, M. Alexandra
dc.contributor.authorSequeira, S.
dc.contributor.authorAlves, L. C.
dc.contributor.authorCorregidor, V.
dc.contributor.authorGuimarães, Fernanda
dc.contributor.authorMascarenhas, João
dc.contributor.authorBrites, Maria João
dc.date.accessioned2016-03-17T17:11:24Z
dc.date.available2016-03-17T17:11:24Z
dc.date.issued2015
dc.description.abstractCapture of sunlight has attracted an increasing interest in the scientific community and triggered the development of efficient and cheap photovoltaic devices. Amongst recent generation technologies for solar energy conversion, dye-sensitized solar cells (DSCs) show an optimal trade-off between high-conversion efficiency and low-cost manufacturing. For the last two decades, significant progress has been made and best energy conversion efficiency of the DSC at the laboratory scale has surpassed 12% [1]. A lot of work has focused on the enlargement of surface areas to enhance the amount of adsorbed dyes by reduction of nanoparticle sizes or utilization of novel structures. Nevertheless there remain some crucial details of DSC operation for which limited information is available, namely dye diffusion and adsorption, surface coverage and dye distribution throughout the nc-TiO2 film. Microprobe techniques can be powerful tools to evaluate the dye load, the dye distribution and dye depth profile in sensitized films. Electron Probe Microanalysis (EPMA) and Ion Beam Analytical (IBA) techniques using a micro-ion beam, namely micro-Particle Induced X-ray Emission ( PIXE) and Rutherford Backscattering Spectrometry (RBS), were used to quantify and to study the distribution of the ruthenium organometallic (N719) dye in TiO2 films, profiting from the different penetration depth and beam sizes of each technique. Two different types of films were prepared and sensitized, mesoporous nanoparticles and 1D nanostructured TiO2 films (figure 1). Despite the low concentration of Ru, the high sensitive analytical techniques used allowed to assess the Ru surface distribution and depth profile. Fig. 2 shows the PIXE maps of Ru and Ti indicating an homogeneous surface distribution. The same figure presents the RBS spectra obtained with a 2 MeV proton beam of the same sample showing that a good spectra fit is obtained considering only two sample layers: the first one with a 1.7 ìm thickness; the second one being the SiO2 substrate. The Ru RBS signal also shows that the dye has an homogeneous depth distribution. Due to the fine spatial resolution of the EPMA/WDS (Wavelength Dispersive Spectroscopy) technique it was possible to visualise the dye distribution in sample cross-section (with micrometer or submicrometer dimensions) as presented in Fig. 3 for the elemental mapping of a mesoporous nanoparticle TiO2 film. Dye load evaluation by two different techniques (ìPIXE and EPMA/WDS) provided similar results (Ru/Ti values around 0.5 %). The distribution analysis of the organometallic dye (N719) was done through ruthenium distribution via X-ray mapping. RBS was used to assess the ruthenium depth profile. This assessment can lead to a better understanding of the device performance.pt_PT
dc.identifier.citationBarreiros, M.A.; Sequeira, S.; Alves, L.C.; Corregidor, V.; Guimarães, F.; Mascarenhas, J.; Brites, M.J. - Microscopy techniques for dye distribution in DSCs nanocrystalline TiO2 films. In: Microscopy and Microanalysis, 2015, Vol. 21, Supplement S6, p. 88-89pt_PT
dc.identifier.doi10.1017/S1431927614014147pt_PT
dc.identifier.issn1431-9276
dc.identifier.urihttp://hdl.handle.net/10400.9/2891
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherCambridge University Presspt_PT
dc.relation.publisherversionhttp://doi.org/10.1017/S1431927614014147pt_PT
dc.subjectTitanium dioxidept_PT
dc.subjectNanostructured materialspt_PT
dc.subjectSolar energy conversionpt_PT
dc.subjectSolar cellspt_PT
dc.subjectDyespt_PT
dc.titleMicroscopy techniques for dye distribution in DSCs nanocrystalline TiO2 films pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage89pt_PT
oaire.citation.startPage88pt_PT
oaire.citation.titleMicroscopy and Microanalysispt_PT
oaire.citation.volume21pt_PT
person.familyNameBarreiros
person.familyNameGuimarães
person.familyNameMascarenhas
person.familyNameBrites
person.givenNameMaria Alexandra
person.givenNameFernanda
person.givenNameJoão
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.orcid0000-0001-6961-9256
person.identifier.orcid0000-0003-0440-8057
person.identifier.orcid0000-0002-1081-7191
person.identifier.ridL-3318-2014
person.identifier.scopus-author-id6603680496
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication3b1e7d6a-3232-443e-a747-f442427dc57a
relation.isAuthorOfPublicationc2c84ba4-fe6b-4c34-8a68-ffc0ad4ab352
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relation.isAuthorOfPublicationafcf1d4c-fc7e-4486-b0f4-58f27acc6834
relation.isAuthorOfPublication.latestForDiscoveryc2c84ba4-fe6b-4c34-8a68-ffc0ad4ab352

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