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dc.contributor.authorCao, Jianyun
dc.contributor.authorEkren, Dursun
dc.contributor.authorPeng, Yudong
dc.contributor.authorAzough, Feridoon
dc.contributor.authorKinloch, Ian A.
dc.contributor.authorFreer, Robert
dc.date.accessioned2021-06-09T08:41:59Z
dc.date.available2021-06-09T08:41:59Z
dc.date.issued2021en_US
dc.identifier.citationCao, J., Ekren, D., Peng, Y., Azough, F., Kinloch, I. A., & Freer, R. (2021). Modulation of Charge Transport at Grain Boundaries in SrTiO3: Toward a High Thermoelectric Power Factor at Room Temperature. ACS applied materials & interfaces, 13(10), 11879–11890. https://doi.org/10.1021/acsami.0c21699en_US
dc.identifier.urihttps://doi.org/10.1021/acsami.0c21699
dc.identifier.urihttps://hdl.handle.net/20.500.12508/1746
dc.description.abstractModulation of the grain boundary properties in thermoelectric materials that have thermally activated electrical conductivity is crucial in order to achieve high performance at low temperatures. In this work, we show directly that the modulation of the potential barrier at the grain boundaries in perovskite SrTiO3 changes the low-temperature dependency of the bulk material's electrical conductivity. By sintering samples in a reducing environment of increasing strength, we produced La0.08Sr0.9TiO3 (LSTO) ceramics that gradually change their electrical conductivity behavior from thermally activated to single-crystal-like, with only minor variations in the Seebeck coefficient. Imaging of the surface potential by Kelvin probe force microscopy found lower potential barriers at the grain boundaries in the LSTO samples that had been processed in the more reducing environments. A theoretical model using the band offset at the grain boundary to represent the potential barrier agreed well with the measured grain boundary potential dependency of conductivity. The present work showed an order of magnitude enhancement in electrical conductivity (from 85 to 1287 S cm(-1)) and power factor (from 143 to 1745 mu W m(-1) K-2) at 330 K by this modulation of charge transport at grain boundaries. This significant reduction in the impact of grain boundaries on charge transport in SrTiO3 provides an opportunity to achieve the ultimate "phonon glass electron crystal" by appropriate experimental design and processing.en_US
dc.language.isoengen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionof10.1021/acsami.0c21699en_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectCharge transporten_US
dc.subjectGrain boundaryen_US
dc.subjectModulationen_US
dc.subjectSrTiO3en_US
dc.subjectThermoelectricen_US
dc.subject.classificationNanoscience & Nanotechnology
dc.subject.classificationMaterials Science
dc.subject.classificationMultidisciplinary
dc.subject.classificationStrontium Titanium Oxide
dc.subject.classificationThermoelectric
dc.subject.classificationPhonon Scattering
dc.subject.otherCarrier transport
dc.subject.otherElectric conductivity
dc.subject.otherElectric power factor
dc.subject.otherLanthanum compounds
dc.subject.otherModulation
dc.subject.otherPerovskite
dc.subject.otherSingle crystals
dc.subject.otherSintering
dc.subject.otherStrontium titanates
dc.subject.otherTemperature
dc.subject.otherThermoelectric power
dc.subject.otherThermoelectricity
dc.subject.otherElectrical conductivity
dc.subject.otherElectrical conductivity behavior
dc.subject.otherGrain boundary properties
dc.subject.otherKelvin probe force microscopy
dc.subject.otherPhonon-glass electron-crystals
dc.subject.otherPotential barrier at the grain boundaries
dc.subject.otherThermo-Electric materials
dc.subject.otherThermoelectric power factors
dc.titleModulation of Charge Transport at Grain Boundaries in SrTiO3: Toward a High Thermoelectric Power Factor at Room Temperatureen_US
dc.typearticleen_US
dc.relation.journalACS Applied Materials and Interfacesen_US
dc.contributor.departmentMühendislik ve Doğa Bilimleri Fakültesi -- Metalurji ve Malzeme Mühendisliği Bölümüen_US
dc.identifier.volume13en_US
dc.identifier.issue10en_US
dc.identifier.startpage11879en_US
dc.identifier.endpage11890en_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.contributor.isteauthorEkren, Dursun
dc.relation.indexWeb of Science - Scopus - PubMeden_US
dc.relation.indexWeb of Science Core Collection - Science Citation Index Expanded


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