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DC Field | Value | Language |
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dc.citation.number | 2 | - |
dc.citation.startPage | 022103 | - |
dc.citation.title | APPLIED PHYSICS LETTERS | - |
dc.citation.volume | 113 | - |
dc.contributor.author | Suh, Joonki | - |
dc.contributor.author | Sarkar, Tarapada | - |
dc.contributor.author | Choe, Hwan Sung | - |
dc.contributor.author | Park, Joonsuk | - |
dc.contributor.author | Venkatesan, T. | - |
dc.contributor.author | Wu, Junqiao | - |
dc.date.accessioned | 2023-12-21T20:36:55Z | - |
dc.date.available | 2023-12-21T20:36:55Z | - |
dc.date.created | 2019-07-17 | - |
dc.date.issued | 2018-07 | - |
dc.description.abstract | Electrical and thermal conductivities of epitaxial, high-quality Ta-doped TiO2 (Ta: TiO2) thin films were experimentally investigated in the temperature range of 35-375 K. Structurally identified as the anatase phase, degenerate Ta doping leads to high electrical conductivity in TiO2, reaching > 10(5) (Omega-m)(-1) at 5 at. % of Ta, making it a potential candidate for indium-free transparent conducting oxides. In stark contrast, Ta doping suppresses the thermal conductivity of TiO2 via strong phonon-impurity scattering imposed by the Ta dopant which has a high mass contrast with Ti that it substitutes. For instance, the near-peak value shows a > 50% reduction, from 9.0 down to 4.4 W/m-K, at just 2 at. % doping at 100 K. Interestingly, further Ta doping beyond 2 at. % no longer reduces the measured total thermal conductivity, which is attributed to a high electronic contribution to thermal conduction that compensates the alloy-scattering loss, as well as possibly the renormalization of phonon dispersion relation in the heavy doping regime originating from dopinginduced lattice stiffening. As a result, at high Ta doping, TiO2 exhibits high electrical conductivity without much degradation of thermal conductivity. For example, near room temperature, 5 at. % Ta doped TiO2 shows over 3 orders of magnitude enhancement in electrical conductivity from undoped TiO2, but with only less than 10% reduction in thermal conductivity. The metallic Ta: TiO2 maintaining reasonable good thermal conductivity might find application in energy devices where good conduction to both charge and heat is needed. | - |
dc.identifier.bibliographicCitation | APPLIED PHYSICS LETTERS, v.113, no.2, pp.022103 | - |
dc.identifier.doi | 10.1063/1.5044563 | - |
dc.identifier.issn | 0003-6951 | - |
dc.identifier.scopusid | 2-s2.0-85049785168 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/27078 | - |
dc.identifier.url | https://aip.scitation.org/doi/10.1063/1.5044563 | - |
dc.identifier.wosid | 000438744300012 | - |
dc.language | 영어 | - |
dc.publisher | AMER INST PHYSICS | - |
dc.title | Compensated thermal conductivity of metallically conductive Ta-doped TiO2 | - |
dc.type | Article | - |
dc.description.isOpenAccess | FALSE | - |
dc.relation.journalWebOfScienceCategory | Physics, Applied | - |
dc.relation.journalResearchArea | Physics | - |
dc.type.docType | Article | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordPlus | TITANIUM-DIOXIDE NANOMATERIALS | - |
dc.subject.keywordPlus | ANATASE TIO2 | - |
dc.subject.keywordPlus | RUTILE | - |
dc.subject.keywordPlus | FREQUENCY | - |
dc.subject.keywordPlus | METAL | - |
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