Charge storage in oxygen deficient phases of TiO2: defect Physics without defects

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dc.contributor.authorPadilha, A. C. M.
dc.contributor.authorRaebiger, H.
dc.contributor.authorRocha, A. R. [UNESP]
dc.contributor.authorDalpian, G. M.
dc.contributor.institutionUniversidade Federal do ABC (UFABC)
dc.contributor.institutionYokohama Natl Univ
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-11-26T16:48:15Z
dc.date.available2018-11-26T16:48:15Z
dc.date.issued2016-07-01
dc.description.abstractDefects in semiconductors can exhibit multiple charge states, which can be used for charge storage applications. Here we consider such charge storage in a series of oxygen deficient phases of TiO2, known as Magneli phases. These Magneli phases (TinO2n-1) present well-defined crystalline structures, i.e., their deviation from stoichiometry is accommodated by changes in space group as opposed to point defects. We show that these phases exhibit intermediate bands with an electronic quadruple donor transitions akin to interstitial Ti defect levels in rutile TiO2. Thus, the Magneli phases behave as if they contained a very large pseudo-defect density: 1/2 per formula unit TinO2n-1. Depending on the Fermi Energy the whole material will become charged. These crystals are natural charge storage materials with a storage capacity that rivals the best known supercapacitors.en
dc.description.affiliationUniv Fed ABC, Ctr Ciencias Nat & Humanas, Santo Andre, SP, Brazil
dc.description.affiliationYokohama Natl Univ, Dept Phys, Yokohama, Kanagawa, Japan
dc.description.affiliationUniv Estadual Paulista, Inst Fis Teor, Sao Paulo, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Fis Teor, Sao Paulo, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdFAPESP: 2011/21719-8
dc.description.sponsorshipIdFAPESP: 2015/05830-7
dc.description.sponsorshipIdFAPESP: 2010/16202-3
dc.description.sponsorshipIdFAPESP: 2011/19924-2
dc.description.sponsorshipIdFAPESP: 2016/11429-6
dc.description.sponsorshipIdFAPESP: 2013/22577-8
dc.format.extent7
dc.identifierhttp://dx.doi.org/10.1038/srep28871
dc.identifier.citationScientific Reports. London: Nature Publishing Group, v. 6, 7 p., 2016.
dc.identifier.doi10.1038/srep28871
dc.identifier.fileWOS000378886700001.pdf
dc.identifier.issn2045-2322
dc.identifier.urihttp://hdl.handle.net/11449/161686
dc.identifier.wosWOS:000378886700001
dc.language.isoeng
dc.publisherNature Publishing Group
dc.relation.ispartofScientific Reports
dc.relation.ispartofsjr1,533
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.titleCharge storage in oxygen deficient phases of TiO2: defect Physics without defectsen
dc.typeArtigo
dcterms.rightsHolderNature Publishing Group

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