Effect of oxygen vacancy distribution on the thermoelectric properties of La-doped SrTiO3 epitaxial thin films

Handle URI:
http://hdl.handle.net/10754/552819
Title:
Effect of oxygen vacancy distribution on the thermoelectric properties of La-doped SrTiO3 epitaxial thin films
Authors:
Sarath Kumar, S. R.; Abutaha, Anas I. ( 0000-0002-8923-5417 ) ; Hedhili, Mohamed N. ( 0000-0002-3624-036X ) ; Alshareef, Husam N. ( 0000-0001-5029-2142 )
Abstract:
A detailed study of the role of oxygen vacancies in determining the effective mass and high temperature (300–1000 K) thermoelectricproperties of La-doped epitaxial SrTiO3 thin films is presented. It is observed that at intermediate temperatures, a transition from degenerate to non-degenerate behavior is observed in the Seebeck coefficient, but not electrical conductivity, which is attributed to heterogeneous oxygen non-stoichiometry. Heikes formula is found to be invalid for the films with oxygen vacancies. By fitting the spectroscopic ellipsometry (SE) data, obtained in the range 300–2100 nm, using a Drude-Lorentz dispersion relation with two Lorentz oscillators, the electrical and optical properties of the films are extracted. Using the excellent agreement between the transport properties extracted from SE modeling and direct electrical measurements, we demonstrate that an increase in concentration of oxygen vacancies results in a simultaneous increase of both carrier concentration and electron effective mass, resulting in a higher power factor.
KAUST Department:
Materials Science and Engineering Program
Citation:
Effect of oxygen vacancy distribution on the thermoelectric properties of La-doped SrTiO3 epitaxial thin films 2012, 112 (11):114104 Journal of Applied Physics
Publisher:
AIP Publishing
Journal:
Journal of Applied Physics
Issue Date:
3-Dec-2012
DOI:
10.1063/1.4767840
Type:
Article
ISSN:
00218979
Additional Links:
http://scitation.aip.org/content/aip/journal/jap/112/11/10.1063/1.4767840
Appears in Collections:
Articles; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorSarath Kumar, S. R.en
dc.contributor.authorAbutaha, Anas I.en
dc.contributor.authorHedhili, Mohamed N.en
dc.contributor.authorAlshareef, Husam N.en
dc.date.accessioned2015-05-14T08:30:38Zen
dc.date.available2015-05-14T08:30:38Zen
dc.date.issued2012-12-03en
dc.identifier.citationEffect of oxygen vacancy distribution on the thermoelectric properties of La-doped SrTiO3 epitaxial thin films 2012, 112 (11):114104 Journal of Applied Physicsen
dc.identifier.issn00218979en
dc.identifier.doi10.1063/1.4767840en
dc.identifier.urihttp://hdl.handle.net/10754/552819en
dc.description.abstractA detailed study of the role of oxygen vacancies in determining the effective mass and high temperature (300–1000 K) thermoelectricproperties of La-doped epitaxial SrTiO3 thin films is presented. It is observed that at intermediate temperatures, a transition from degenerate to non-degenerate behavior is observed in the Seebeck coefficient, but not electrical conductivity, which is attributed to heterogeneous oxygen non-stoichiometry. Heikes formula is found to be invalid for the films with oxygen vacancies. By fitting the spectroscopic ellipsometry (SE) data, obtained in the range 300–2100 nm, using a Drude-Lorentz dispersion relation with two Lorentz oscillators, the electrical and optical properties of the films are extracted. Using the excellent agreement between the transport properties extracted from SE modeling and direct electrical measurements, we demonstrate that an increase in concentration of oxygen vacancies results in a simultaneous increase of both carrier concentration and electron effective mass, resulting in a higher power factor.en
dc.publisherAIP Publishingen
dc.relation.urlhttp://scitation.aip.org/content/aip/journal/jap/112/11/10.1063/1.4767840en
dc.rightsArchived with thanks to Journal of Applied Physicsen
dc.titleEffect of oxygen vacancy distribution on the thermoelectric properties of La-doped SrTiO3 epitaxial thin filmsen
dc.typeArticleen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.identifier.journalJournal of Applied Physicsen
dc.eprint.versionPublisher's Version/PDFen
kaust.authorSarath Kumar, S. R.en
kaust.authorAbutaha, Anas I.en
kaust.authorHedhili, Mohamed N.en
kaust.authorAlshareef, Husam N.en
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