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Thermal conductivity reduction in silicon fishbone nanowires

Semiconductor nanowires are potential building blocks for future thermoelectrics because of their low thermal conductivity. Recent theoretical works suggest that thermal conductivity of nanowires can be further reduced by additional constrictions, pillars or wings. Here, we experimentally study heat...

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Autores principales: Maire, Jeremie, Anufriev, Roman, Hori, Takuma, Shiomi, Junichiro, Volz, Sebastian, Nomura, Masahiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5849754/
https://www.ncbi.nlm.nih.gov/pubmed/29535335
http://dx.doi.org/10.1038/s41598-018-22509-0
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author Maire, Jeremie
Anufriev, Roman
Hori, Takuma
Shiomi, Junichiro
Volz, Sebastian
Nomura, Masahiro
author_facet Maire, Jeremie
Anufriev, Roman
Hori, Takuma
Shiomi, Junichiro
Volz, Sebastian
Nomura, Masahiro
author_sort Maire, Jeremie
collection PubMed
description Semiconductor nanowires are potential building blocks for future thermoelectrics because of their low thermal conductivity. Recent theoretical works suggest that thermal conductivity of nanowires can be further reduced by additional constrictions, pillars or wings. Here, we experimentally study heat conduction in silicon nanowires with periodic wings, called fishbone nanowires. We find that like in pristine nanowires, the nanowire cross-section controls thermal conductivity of fishbone nanowires. However, the periodic wings further reduce the thermal conductivity. Whereas an increase in the wing width only slightly affects the thermal conductivity, an increase in the wing depth clearly reduces thermal conductivity, and this reduction is stronger in the structures with narrower nanowires. Our experimental data is supported by the Callaway-Holland model, finite element modelling and phonon transport simulations.
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spelling pubmed-58497542018-03-21 Thermal conductivity reduction in silicon fishbone nanowires Maire, Jeremie Anufriev, Roman Hori, Takuma Shiomi, Junichiro Volz, Sebastian Nomura, Masahiro Sci Rep Article Semiconductor nanowires are potential building blocks for future thermoelectrics because of their low thermal conductivity. Recent theoretical works suggest that thermal conductivity of nanowires can be further reduced by additional constrictions, pillars or wings. Here, we experimentally study heat conduction in silicon nanowires with periodic wings, called fishbone nanowires. We find that like in pristine nanowires, the nanowire cross-section controls thermal conductivity of fishbone nanowires. However, the periodic wings further reduce the thermal conductivity. Whereas an increase in the wing width only slightly affects the thermal conductivity, an increase in the wing depth clearly reduces thermal conductivity, and this reduction is stronger in the structures with narrower nanowires. Our experimental data is supported by the Callaway-Holland model, finite element modelling and phonon transport simulations. Nature Publishing Group UK 2018-03-13 /pmc/articles/PMC5849754/ /pubmed/29535335 http://dx.doi.org/10.1038/s41598-018-22509-0 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Maire, Jeremie
Anufriev, Roman
Hori, Takuma
Shiomi, Junichiro
Volz, Sebastian
Nomura, Masahiro
Thermal conductivity reduction in silicon fishbone nanowires
title Thermal conductivity reduction in silicon fishbone nanowires
title_full Thermal conductivity reduction in silicon fishbone nanowires
title_fullStr Thermal conductivity reduction in silicon fishbone nanowires
title_full_unstemmed Thermal conductivity reduction in silicon fishbone nanowires
title_short Thermal conductivity reduction in silicon fishbone nanowires
title_sort thermal conductivity reduction in silicon fishbone nanowires
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5849754/
https://www.ncbi.nlm.nih.gov/pubmed/29535335
http://dx.doi.org/10.1038/s41598-018-22509-0
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