Control of surface morphology and crystal structure of silicon nanowires and their coherent phonon transport characteristics
DC Field | Value | Language |
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dc.contributor.author | Lee, Seung-Yong | - |
dc.contributor.author | Kim, Gil-Sung | - |
dc.contributor.author | Lim, Jongwoo | - |
dc.contributor.author | Han, Seungwoo | - |
dc.contributor.author | Li, Baowen | - |
dc.contributor.author | Thong, John T. L. | - |
dc.contributor.author | Yoon, Young-Gui | - |
dc.contributor.author | Lee, Sang-Kwon | - |
dc.date.available | 2019-03-08T22:37:25Z | - |
dc.date.issued | 2014-02 | - |
dc.identifier.issn | 1359-6454 | - |
dc.identifier.issn | 1873-2453 | - |
dc.identifier.uri | https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/12534 | - |
dc.description.abstract | We report on the first experimental observation of coherent phonon transport characteristics in silicon nanowires (SiNWs) synthesized by a one-step surface reconstruction growth mechanism. As-grown SiNWs taper down along the growth direction alongside a decrease in both roughness and stacking fault density. Furthermore, by systematically measuring the temperature-dependent thermal conductivity using a conventional thermal bridge method, we found that the measured thermal conductivity values of surface-reconstructed (SR)-SiNWs (13-20W m(-1) K-1) at room temperature are markedly lower than that predicted from the conventional diffuse phonon transport model for given NW diameters. We also observed that the thermal conductivities of SR-SiNWs exhibit an unexpected power law of similar to T-alpha (1.6 <= alpha <= 1.9) in the temperature range of 25-60 K, which cannot be explained by the typical similar to Debye T-3 behavior. Interestingly, our experimental results are consistent with a frequency-dependent model, which can be induced by coherence in the diffuse reflection and backscattering of phonons at the rough surface and stacking faults on SR-SiNWs, resulting in the suppressed thermal conductivity. Therefore, the demonstrated rational synthesis model and measurement technique promise great potential for improving the performance of a wide range of one-dimensional NW-based thermoelectric devices. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. | - |
dc.format.extent | 10 | - |
dc.language | 영어 | - |
dc.language.iso | ENG | - |
dc.publisher | PERGAMON-ELSEVIER SCIENCE LTD | - |
dc.title | Control of surface morphology and crystal structure of silicon nanowires and their coherent phonon transport characteristics | - |
dc.type | Article | - |
dc.identifier.doi | 10.1016/j.actamat.2013.11.042 | - |
dc.identifier.bibliographicCitation | ACTA MATERIALIA, v.64, pp 62 - 71 | - |
dc.description.isOpenAccess | N | - |
dc.identifier.wosid | 000331017800007 | - |
dc.identifier.scopusid | 2-s2.0-84890260061 | - |
dc.citation.endPage | 71 | - |
dc.citation.startPage | 62 | - |
dc.citation.title | ACTA MATERIALIA | - |
dc.citation.volume | 64 | - |
dc.type.docType | Article | - |
dc.publisher.location | 영국 | - |
dc.subject.keywordAuthor | Silicon nanowires | - |
dc.subject.keywordAuthor | Thermal conductivity | - |
dc.subject.keywordAuthor | Stacking fault | - |
dc.subject.keywordAuthor | Phonon boundary scattering | - |
dc.subject.keywordAuthor | Coherent phonon transport | - |
dc.subject.keywordPlus | THERMAL-CONDUCTIVITY | - |
dc.subject.keywordPlus | SI NANOWIRES | - |
dc.subject.keywordPlus | DEPENDENCE | - |
dc.subject.keywordPlus | GROWTH | - |
dc.subject.keywordPlus | GOLD | - |
dc.subject.keywordPlus | MIGRATION | - |
dc.subject.keywordPlus | DIAMETER | - |
dc.subject.keywordPlus | DENSITY | - |
dc.relation.journalResearchArea | Materials Science | - |
dc.relation.journalResearchArea | Metallurgy & Metallurgical Engineering | - |
dc.relation.journalWebOfScienceCategory | Materials Science, Multidisciplinary | - |
dc.relation.journalWebOfScienceCategory | Metallurgy & Metallurgical Engineering | - |
dc.description.journalRegisteredClass | sci | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
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