Enhanced thermoelectric figure-of-merit in thermally robust, nanostructured superlattices based on SrTiO3

Handle URI:
http://hdl.handle.net/10754/564112
Title:
Enhanced thermoelectric figure-of-merit in thermally robust, nanostructured superlattices based on SrTiO3
Authors:
Abutaha, Anas I. ( 0000-0002-8923-5417 ) ; Sarath Kumar, S. R.; Li, Kun; Dehkordi, Arash Mehdizadeh; Tritt, Terry M.; Alshareef, Husam N. ( 0000-0001-5029-2142 )
Abstract:
Thermoelectric (TE) metal oxides overcome crucial disadvantages of traditional heavy-metal-alloy-based TE materials, such as toxicity, scarcity, and instability at high temperatures. Here, we report the TE properties of metal oxide superlattices, composed from alternating layers of 5% Pr3+-doped SrTiO3-δ (SPTO) and 20% Nb5+-doped SrTiO3-δ (STNO) fabricated using pulsed laser deposition (PLD). Excellent stability is established for these superlattices by maintaining the crystal structure and reproducing the TE properties after long-time (20 h) annealing at high temperature (∼1000 K). The introduction of oxygen vacancies as well as extrinsic dopants (Pr3+ and Nb5+), with different masses and ionic radii, at different lattice sites in SPTO and STNO layers, respectively, results in a substantial reduction of thermal conductivity via scattering a wider range of phonon spectrum without limiting the electrical transport and thermopower, leading to an enhancement in the figure-of-merit (ZT). The superlattice composed of 20 SPTO/STNO pairs, 8 unit cells of each layer, exhibits a ZT value of 0.46 at 1000 K, which is the highest among SrTiO3-based thermoelectrics. © 2015 American Chemical Society.
KAUST Department:
Materials Science and Engineering Program; Physical Sciences and Engineering (PSE) Division; Core Labs; Functional Nanomaterials and Devices Research Group
Publisher:
American Chemical Society (ACS)
Journal:
Chemistry of Materials
Issue Date:
24-Mar-2015
DOI:
10.1021/acs.chemmater.5b00144
Type:
Article
ISSN:
08974756
Sponsors:
Research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST).
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorAbutaha, Anas I.en
dc.contributor.authorSarath Kumar, S. R.en
dc.contributor.authorLi, Kunen
dc.contributor.authorDehkordi, Arash Mehdizadehen
dc.contributor.authorTritt, Terry M.en
dc.contributor.authorAlshareef, Husam N.en
dc.date.accessioned2015-08-03T12:32:41Zen
dc.date.available2015-08-03T12:32:41Zen
dc.date.issued2015-03-24en
dc.identifier.issn08974756en
dc.identifier.doi10.1021/acs.chemmater.5b00144en
dc.identifier.urihttp://hdl.handle.net/10754/564112en
dc.description.abstractThermoelectric (TE) metal oxides overcome crucial disadvantages of traditional heavy-metal-alloy-based TE materials, such as toxicity, scarcity, and instability at high temperatures. Here, we report the TE properties of metal oxide superlattices, composed from alternating layers of 5% Pr3+-doped SrTiO3-δ (SPTO) and 20% Nb5+-doped SrTiO3-δ (STNO) fabricated using pulsed laser deposition (PLD). Excellent stability is established for these superlattices by maintaining the crystal structure and reproducing the TE properties after long-time (20 h) annealing at high temperature (∼1000 K). The introduction of oxygen vacancies as well as extrinsic dopants (Pr3+ and Nb5+), with different masses and ionic radii, at different lattice sites in SPTO and STNO layers, respectively, results in a substantial reduction of thermal conductivity via scattering a wider range of phonon spectrum without limiting the electrical transport and thermopower, leading to an enhancement in the figure-of-merit (ZT). The superlattice composed of 20 SPTO/STNO pairs, 8 unit cells of each layer, exhibits a ZT value of 0.46 at 1000 K, which is the highest among SrTiO3-based thermoelectrics. © 2015 American Chemical Society.en
dc.description.sponsorshipResearch reported in this publication was supported by King Abdullah University of Science and Technology (KAUST).en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleEnhanced thermoelectric figure-of-merit in thermally robust, nanostructured superlattices based on SrTiO3en
dc.typeArticleen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentCore Labsen
dc.contributor.departmentFunctional Nanomaterials and Devices Research Groupen
dc.identifier.journalChemistry of Materialsen
dc.contributor.institutionDepartment of Physics and Astronomy, Clemson UniversityClemson, SC, United Statesen
kaust.authorAbutaha, Anas I.en
kaust.authorLi, Kunen
kaust.authorAlshareef, Husam N.en
kaust.authorSarath Kumar, S. R.en
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