Is Reduced Strontium Titanate a Semiconductor or a Metal?

dc.bibliographicCitation.firstPage744eng
dc.bibliographicCitation.issue7eng
dc.bibliographicCitation.volume11eng
dc.contributor.authorRodenbücher, Christian
dc.contributor.authorGuguschev, Christo
dc.contributor.authorKorte, Carsten
dc.contributor.authorBette, Sebastian
dc.contributor.authorSzot, Kristof
dc.date.accessioned2022-01-18T09:42:10Z
dc.date.available2022-01-18T09:42:10Z
dc.date.issued2021
dc.description.abstractIn recent decades, the behavior of SrTiO3 upon annealing in reducing conditions has been under intense academic scrutiny. Classically, its conductivity can be described using point defect chemistry and predicting n-type or p-type semiconducting behavior depending on oxygen activity. In contrast, many examples of metallic behavior induced by thermal reduction have recently appeared in the literature, challenging this established understanding. In this study, we aim to resolve this contradiction by demonstrating that an initially insulating, as-received SrTiO3 single crystal can indeed be reduced to a metallic state, and is even stable against room temperature reoxidation. However, once the sample has been oxidized at a high temperature, subsequent reduction can no longer be used to induce metallic behavior, but semiconducting behavior in agreement with the predictions of point defect chemistry is observed. Our results indicate that the dislocation-rich surface layer plays a decisive role and that its local chemical composition can be changed depending on annealing conditions. This reveals that the prediction of the macroscopic electronic properties of SrTiO3 is a highly complex task, and not only the current temperature and oxygen activity but also the redox history play an important role.eng
dc.description.versionpublishedVersioneng
dc.identifier.urihttps://oa.tib.eu/renate/handle/123456789/7841
dc.identifier.urihttps://doi.org/10.34657/6882
dc.language.isoengeng
dc.publisherBasel : MDPIeng
dc.relation.doihttps://doi.org/10.3390/cryst11070744
dc.relation.essn2073-4352
dc.relation.ispartofseriesCrystals : open access journal 11 (2021), Nr. 7eng
dc.rights.licenseCC BY 4.0 Unportedeng
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/eng
dc.subjectInsulator–metal transitioneng
dc.subjectPoint defect chemistryeng
dc.subjectRedox reactionseng
dc.subjectStrontium titanateeng
dc.subjectThermal reductioneng
dc.subject.ddc540eng
dc.titleIs Reduced Strontium Titanate a Semiconductor or a Metal?eng
dc.typearticleeng
dc.typeTexteng
dcterms.bibliographicCitation.journalTitleCrystals : open access journaleng
tib.accessRightsopenAccesseng
wgl.contributorIKZeng
wgl.subjectChemieeng
wgl.typeZeitschriftenartikeleng
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