Tuning the dielectric response of HfO 2 nanoparticles by Si-doping

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dc.contributor.authorSALES, T.S.N.
dc.contributor.authorBURIMOVA, A.
dc.contributor.authorCARBONARI, A.W.
dc.contributor.authorBOSCH-SANTOS, B.
dc.contributor.authorPEREIRA, L.F.D.
dc.coverageInternacionalpt_BR
dc.creator.eventoINTERNATIONAL SYMPOSIUM ON NANOPARTICLES-NANOMATERIALS AND APPLICATIONS, 3rdpt_BR
dc.date.accessioned2019-03-11T10:50:06Z
dc.date.available2019-03-11T10:50:06Z
dc.date.eventoJanuary 22-25, 2018pt_BR
dc.description.abstractThe properties of bulk materials and corresponding nanostructures may differ significantly which leads to distinct scopes of their applications. As the miniaturization continues, nanostructures show great potential in microelectronics. Among others, nanostructured hafnium (IV) oxide (hafnia, HfO 2 ) has attracted considerable attention due to its chemical stability and physical characteristics 1 . It has high dielectric constant ( ∼ 25) and is relatively thermally stable (melting point at 3085 K) 2 . These qualities have made hafnia an alternative to SiO 2 for gate oxide layers in field-effect transistors, since the leakage current issue and consequent thickness limitations of silica were hindering miniaturization. Clearly, the features of HfO 2 can be further tuned by doping 3 . Understanding the relation between the macro-properties of such complex systems and their architecture at atomic scale should help select doping parameters adequate for particular applications. In this work 0at%, 5at% and 10at% Si-doped HfO 2 nanoparticles (NPs) were synthesized via sol-gel method. Basic characterization included scanning/transmission electron microscopy, electron backscattering and X-ray diffraction. NPs were demonstrated to have spherical shape, sizes in the range of 10─40nm and monoclinic structure (m-HfO 2 ). Local structure and electronic environment of the samples was probed with perturbed angular correlation (PAC) spectroscopy. Sample irradiation resulted in the formation of 181 Hf isotopes (PAC probes 4 ) at several sites whose decay to 181 Ta is preferentially through an intermediate (metastable) state with lifetime depending strongly on local extra-nuclear fields. Thus, time distribution of decay probability provided information on the ambient of the probe. For undoped sample PAC data has revealed two distinct Hf sites, one of those possessing well-defined quadrupole frequency ν Q ≈ 750 MHz and electric field distribution asymmetry η ≈ 0.36. Site occupation raised with temperature from 16% at T = 473K to 75% at T = 1073K, which agrees with the results found in the literature for the quadrupole interactions of 181 Ta in m-HfO 2 4 . For the doped samples (both Si 5at% and 10at%) additional site was observed. Symmetrical electric field distribution ( η = 0) and a greater site fraction at T = 673─873K allowed to attribute it to a tetragonal phase of hafnia. First principles analysis has shown that doping m-HfO 2 with certain cations can induce the formation of tetragonal phase 5 . We emphasize that this phase is desirable for transistor applications since it is associated with the highest dielectric constant.pt_BR
dc.event.siglaISN2Apt_BR
dc.identifier.citationSALES, T.S.N.; BURIMOVA, A.; CARBONARI, A.W.; BOSCH-SANTOS, B.; PEREIRA, L.F.D. Tuning the dielectric response of HfO 2 nanoparticles by Si-doping. In: INTERNATIONAL SYMPOSIUM ON NANOPARTICLES-NANOMATERIALS AND APPLICATIONS, 3rd, January 22-25, 2018, Caparica, Portugal. <b>Abstract...</b> Disponível em: http://repositorio.ipen.br/handle/123456789/29774.
dc.identifier.orcidaguardandopt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-4499-5949
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/29774
dc.local.eventoCaparica, Portugalpt_BR
dc.rightsopenAccesspt_BR
dc.titleTuning the dielectric response of HfO 2 nanoparticles by Si-dopingpt_BR
dc.typeResumo de eventos científicospt_BR
dspace.entity.typePublication
ipen.autorANASTASIA BURIMOVA
ipen.autorLUCIANO FABRICIO DIAS PEREIRA
ipen.autorBRIANNA BOSCH DOS SANTOS
ipen.autorARTUR WILSON CARBONARI
ipen.autorTATIANE DA SILVA NASCIMENTO
ipen.codigoautor14454
ipen.codigoautor3346
ipen.codigoautor7480
ipen.codigoautor1437
ipen.codigoautor9322
ipen.contributor.ipenauthorANASTASIA BURIMOVA
ipen.contributor.ipenauthorLUCIANO FABRICIO DIAS PEREIRA
ipen.contributor.ipenauthorBRIANNA BOSCH DOS SANTOS
ipen.contributor.ipenauthorARTUR WILSON CARBONARI
ipen.contributor.ipenauthorTATIANE DA SILVA NASCIMENTO
ipen.date.recebimento19-03pt_BR
ipen.event.datapadronizada2018pt_BR
ipen.identifier.ipendoc25561pt_BR
ipen.notas.internasAbstractpt_BR
ipen.type.genreResumo
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relation.isAuthorOfPublicationb6252b5c-6acb-4cd0-bd90-b69988090f74
relation.isAuthorOfPublication8eb536a6-8b2a-449c-aebf-392b54cd208f
relation.isAuthorOfPublication8f236231-e73c-4182-a596-d83e49cd0404
relation.isAuthorOfPublication24b79047-b1bf-4409-a205-0d39870c9cfd
relation.isAuthorOfPublication.latestForDiscovery24b79047-b1bf-4409-a205-0d39870c9cfd
sigepi.autor.atividadeSALES, T.S.N.:9322:310:Spt_BR
sigepi.autor.atividadeBURIMOVA, A.:14454:310:Npt_BR
sigepi.autor.atividadeCARBONARI, A.W.:1437:310:Npt_BR
sigepi.autor.atividadeBOSCH-SANTOS, B.:7480:310:Npt_BR
sigepi.autor.atividadePEREIRA, L.F.D.:3346:310:Npt_BR
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