Enhanced thermoelectric properties of lightly Nb doped SrTiO3 thin films

Novel thermoelectric materials developed for operation at room temperature must have similar or better performance along with being as ecofriendly as those commercially used, e.g., BiTe, in terms of their toxicity and cost. In this work, we present an in-depth study of the thermoelectric properties...

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Autores: Bhansali, Sweta, Khunsin, Worawut, Chatterjee, Arindom|||0000-0002-0861-2058, Santiso, José|||0000-0003-4274-2101, Abad Mayor, Begoña|||0000-0001-7589-7973, Martín González, Marisol, Jakob, Gerhard|||0000-0001-9466-0840, Sotomayor Torres, Clivia M.|||0000-0001-9986-2716, Chávez Ángel, Emigdio|||0000-0002-9783-0806
Tipo de recurso: artículo
Fecha de publicación:2019
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:223233
Acceso en línea:https://ddd.uab.cat/record/223233
https://dx.doi.org/urn:doi:10.1039/c9na00361d
Access Level:acceso abierto
Palabra clave:Different substrates
Doping concentration
Lanthanum Strontium Aluminate
Maximum power factor
Seebeck coefficient measurement
Thermo-Electric materials
Thermoelectric figure of merit
Thermoelectric properties
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spelling Enhanced thermoelectric properties of lightly Nb doped SrTiO3 thin filmsBhansali, SwetaKhunsin, WorawutChatterjee, Arindom|||0000-0002-0861-2058Santiso, José|||0000-0003-4274-2101Abad Mayor, Begoña|||0000-0001-7589-7973Martín González, MarisolJakob, Gerhard|||0000-0001-9466-0840Sotomayor Torres, Clivia M.|||0000-0001-9986-2716Chávez Ángel, Emigdio|||0000-0002-9783-0806Different substratesDoping concentrationLanthanum Strontium AluminateMaximum power factorSeebeck coefficient measurementThermo-Electric materialsThermoelectric figure of meritThermoelectric propertiesNovel thermoelectric materials developed for operation at room temperature must have similar or better performance along with being as ecofriendly as those commercially used, e.g., BiTe, in terms of their toxicity and cost. In this work, we present an in-depth study of the thermoelectric properties of epitaxial Nb-doped strontium titanate (SrTiNbO) thin films as a function of (i) doping concentration, (ii) film thickness and (iii) substrate type. The excellent crystal quality was confirmed by high resolution transmission electron microscopy and X-ray diffraction analysis. The thermoelectric properties were measured by the three-omega method (thermal conductivity) and van der Pauw method (electrical resistivity), complemented by Seebeck coefficient measurements. A maximum power factor of 8.9 × 10 W m K and a thermoelectric figure of merit of 0.49 were measured at room temperature in 50 nm-thick films grown on lanthanum strontium aluminate. The mechanisms behind this high figure of merit are discussed in terms of a possible two-dimensional electron gas, increase of the effective mass of the electrons, electron filtering and change in strain due to different substrates. The overall enhancement of the thermoelectric properties suggests that SrTiNbO is a very promising n-type candidate for room- to high-temperature applications. 22019-01-0120192019-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/223233https://dx.doi.org/urn:doi:10.1039/c9na00361dreponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengEuropean Commission https://doi.org/10.13039/501100000780 645658Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 FIS2015-70862-PMinisterio de Economía y Competitividad https://doi.org/10.13039/501100003329 MAT2016-77100-C2-1-PMinisterio de Economía y Competitividad https://doi.org/10.13039/501100003329 SEV-2017-0706open accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original.https://creativecommons.org/licenses/by-nc/4.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:2232332026-06-06T12:50:31Z
dc.title.none.fl_str_mv Enhanced thermoelectric properties of lightly Nb doped SrTiO3 thin films
title Enhanced thermoelectric properties of lightly Nb doped SrTiO3 thin films
spellingShingle Enhanced thermoelectric properties of lightly Nb doped SrTiO3 thin films
Bhansali, Sweta
Different substrates
Doping concentration
Lanthanum Strontium Aluminate
Maximum power factor
Seebeck coefficient measurement
Thermo-Electric materials
Thermoelectric figure of merit
Thermoelectric properties
title_short Enhanced thermoelectric properties of lightly Nb doped SrTiO3 thin films
title_full Enhanced thermoelectric properties of lightly Nb doped SrTiO3 thin films
title_fullStr Enhanced thermoelectric properties of lightly Nb doped SrTiO3 thin films
title_full_unstemmed Enhanced thermoelectric properties of lightly Nb doped SrTiO3 thin films
title_sort Enhanced thermoelectric properties of lightly Nb doped SrTiO3 thin films
dc.creator.none.fl_str_mv Bhansali, Sweta
Khunsin, Worawut
Chatterjee, Arindom|||0000-0002-0861-2058
Santiso, José|||0000-0003-4274-2101
Abad Mayor, Begoña|||0000-0001-7589-7973
Martín González, Marisol
Jakob, Gerhard|||0000-0001-9466-0840
Sotomayor Torres, Clivia M.|||0000-0001-9986-2716
Chávez Ángel, Emigdio|||0000-0002-9783-0806
author Bhansali, Sweta
author_facet Bhansali, Sweta
Khunsin, Worawut
Chatterjee, Arindom|||0000-0002-0861-2058
Santiso, José|||0000-0003-4274-2101
Abad Mayor, Begoña|||0000-0001-7589-7973
Martín González, Marisol
Jakob, Gerhard|||0000-0001-9466-0840
Sotomayor Torres, Clivia M.|||0000-0001-9986-2716
Chávez Ángel, Emigdio|||0000-0002-9783-0806
author_role author
author2 Khunsin, Worawut
Chatterjee, Arindom|||0000-0002-0861-2058
Santiso, José|||0000-0003-4274-2101
Abad Mayor, Begoña|||0000-0001-7589-7973
Martín González, Marisol
Jakob, Gerhard|||0000-0001-9466-0840
Sotomayor Torres, Clivia M.|||0000-0001-9986-2716
Chávez Ángel, Emigdio|||0000-0002-9783-0806
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Different substrates
Doping concentration
Lanthanum Strontium Aluminate
Maximum power factor
Seebeck coefficient measurement
Thermo-Electric materials
Thermoelectric figure of merit
Thermoelectric properties
topic Different substrates
Doping concentration
Lanthanum Strontium Aluminate
Maximum power factor
Seebeck coefficient measurement
Thermo-Electric materials
Thermoelectric figure of merit
Thermoelectric properties
description Novel thermoelectric materials developed for operation at room temperature must have similar or better performance along with being as ecofriendly as those commercially used, e.g., BiTe, in terms of their toxicity and cost. In this work, we present an in-depth study of the thermoelectric properties of epitaxial Nb-doped strontium titanate (SrTiNbO) thin films as a function of (i) doping concentration, (ii) film thickness and (iii) substrate type. The excellent crystal quality was confirmed by high resolution transmission electron microscopy and X-ray diffraction analysis. The thermoelectric properties were measured by the three-omega method (thermal conductivity) and van der Pauw method (electrical resistivity), complemented by Seebeck coefficient measurements. A maximum power factor of 8.9 × 10 W m K and a thermoelectric figure of merit of 0.49 were measured at room temperature in 50 nm-thick films grown on lanthanum strontium aluminate. The mechanisms behind this high figure of merit are discussed in terms of a possible two-dimensional electron gas, increase of the effective mass of the electrons, electron filtering and change in strain due to different substrates. The overall enhancement of the thermoelectric properties suggests that SrTiNbO is a very promising n-type candidate for room- to high-temperature applications.
publishDate 2019
dc.date.none.fl_str_mv 2
2019-01-01
2019
2019-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/223233
https://dx.doi.org/urn:doi:10.1039/c9na00361d
url https://ddd.uab.cat/record/223233
https://dx.doi.org/urn:doi:10.1039/c9na00361d
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv European Commission https://doi.org/10.13039/501100000780 645658
Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 FIS2015-70862-P
Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 MAT2016-77100-C2-1-P
Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 SEV-2017-0706
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by-nc/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by-nc/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
reponame_str Dipòsit Digital de Documents de la UAB
collection Dipòsit Digital de Documents de la UAB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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