Thermal conductivity in disordered porous nanomembranes

In this work we study the effects of disorder on the thermal conductivity of porous 100 nm thick silicon membranes, in which the size, shape and position of the pores were varied randomly. Measurements using two-laser Raman thermometry on both non-patterned and porous membranes revealed more than a...

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Autores: Sledzinska, Marianna, Graczykowski, Bartlomiej, Alzina, Francesc, Melia, Umberto, Termentzidis, Konstantinos, Lacroix, David, Sotomayor Torres, C. M.
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2019
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositório:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/201149
Acesso em linha:http://hdl.handle.net/10261/201149
Access Level:Acceso aberto
Palavra-chave:Silicon nanomembrane
Thermal conductivity
Monte Carlo methods
Disorder
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spelling Thermal conductivity in disordered porous nanomembranesSledzinska, MariannaGraczykowski, BartlomiejAlzina, FrancescMelia, UmbertoTermentzidis, KonstantinosLacroix, DavidSotomayor Torres, C. M.Silicon nanomembraneThermal conductivityMonte Carlo methodsDisorderIn this work we study the effects of disorder on the thermal conductivity of porous 100 nm thick silicon membranes, in which the size, shape and position of the pores were varied randomly. Measurements using two-laser Raman thermometry on both non-patterned and porous membranes revealed more than a 10-fold reduction of the thermal conductivity compared to that of bulk silicon and a six-fold reduction compared to non-patterned membranes for the sample with random pore shapes. Using Monte Carlo methods we solved the Boltzmann transport equation for phonons and compared different possibilities of pore organization and its influence on the thermal conductivity of the samples. The simulations confirmed that the strongest reduction of thermal conductivity is achieved for a distribution of pores with arbitrary shapes that partially overlap. Up to a 15% reduction of the thermal conductivity with respect to the purely circular pores was predicted for a porous membrane with 37% filling fraction. The effect of the pore shape and distribution was further studied. Maps of temperature and heat flux distributions clearly showed that for particular pore placement heat transport can be efficiently blocked and hot spots can be found in narrow channels between pores. These findings have an impact on the fabrication of membrane-based thermoelectric devices, where low thermal conductivity is required. This work shows that for porous membranes with a given filling fraction the thermal conductivity can be further modified by introducing disorder in the shape and placement of the pores.The ICN2 is funded by the CERCA program/Generalitat de Catalunya. ICN2 is supported by the Severo Ochoa program from Spanish MINECO (Grant No. SEV-2017-0706). We acknowledge the financial support from the Spanish MINECO project PHENTOM (FIS2015-70862-P). We acknowledge the financial support from the French ANR with the project MESOPHON (ANR-15-CE30-0019). BG acknowledges the support from the Foundation for Polish Science (Homing/ 2016-1/2 and First Team POIR.04.04.00-00-5D1B/18-00) and ERC AdG SmartPhon (Grant No. 694977).Peer reviewedIOP PublishingAgencia Estatal de Investigación (España)Generalitat de CatalunyaMinisterio de Economía y Competitividad (España)Ministerio de Ciencia, Innovación y Universidades (España)Agence Nationale de la Recherche (France)Foundation for Polish ScienceEuropean CommissionEuropean Research CouncilSledzinska, Marianna [0000-0001-8592-1121]Graczykowski, B. [0000-0003-4787-8622]Alzina, Francesc [0000-0002-7082-0624]Melia, Umberto [0000-0003-3033-0505]Termentzidis, Konstantinos [0000-0002-8521-7107]Lacroix, David [0000-0001-6067-8524]Sotomayor Torres, C. M. [0000-0001-9986-2716]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202020202019info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/201149reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/EC/H2020/694977SEV-2017-0706/AEI/10.13039/501100011033info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/SEV-2017-0706info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2015-70862-Phttps://doi.org/10.1088/1361-6528/ab0ecdSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2011492026-05-22T06:33:51Z
dc.title.none.fl_str_mv Thermal conductivity in disordered porous nanomembranes
title Thermal conductivity in disordered porous nanomembranes
spellingShingle Thermal conductivity in disordered porous nanomembranes
Sledzinska, Marianna
Silicon nanomembrane
Thermal conductivity
Monte Carlo methods
Disorder
title_short Thermal conductivity in disordered porous nanomembranes
title_full Thermal conductivity in disordered porous nanomembranes
title_fullStr Thermal conductivity in disordered porous nanomembranes
title_full_unstemmed Thermal conductivity in disordered porous nanomembranes
title_sort Thermal conductivity in disordered porous nanomembranes
dc.creator.none.fl_str_mv Sledzinska, Marianna
Graczykowski, Bartlomiej
Alzina, Francesc
Melia, Umberto
Termentzidis, Konstantinos
Lacroix, David
Sotomayor Torres, C. M.
author Sledzinska, Marianna
author_facet Sledzinska, Marianna
Graczykowski, Bartlomiej
Alzina, Francesc
Melia, Umberto
Termentzidis, Konstantinos
Lacroix, David
Sotomayor Torres, C. M.
author_role author
author2 Graczykowski, Bartlomiej
Alzina, Francesc
Melia, Umberto
Termentzidis, Konstantinos
Lacroix, David
Sotomayor Torres, C. M.
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Agencia Estatal de Investigación (España)
Generalitat de Catalunya
Ministerio de Economía y Competitividad (España)
Ministerio de Ciencia, Innovación y Universidades (España)
Agence Nationale de la Recherche (France)
Foundation for Polish Science
European Commission
European Research Council
Sledzinska, Marianna [0000-0001-8592-1121]
Graczykowski, B. [0000-0003-4787-8622]
Alzina, Francesc [0000-0002-7082-0624]
Melia, Umberto [0000-0003-3033-0505]
Termentzidis, Konstantinos [0000-0002-8521-7107]
Lacroix, David [0000-0001-6067-8524]
Sotomayor Torres, C. M. [0000-0001-9986-2716]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Silicon nanomembrane
Thermal conductivity
Monte Carlo methods
Disorder
topic Silicon nanomembrane
Thermal conductivity
Monte Carlo methods
Disorder
description In this work we study the effects of disorder on the thermal conductivity of porous 100 nm thick silicon membranes, in which the size, shape and position of the pores were varied randomly. Measurements using two-laser Raman thermometry on both non-patterned and porous membranes revealed more than a 10-fold reduction of the thermal conductivity compared to that of bulk silicon and a six-fold reduction compared to non-patterned membranes for the sample with random pore shapes. Using Monte Carlo methods we solved the Boltzmann transport equation for phonons and compared different possibilities of pore organization and its influence on the thermal conductivity of the samples. The simulations confirmed that the strongest reduction of thermal conductivity is achieved for a distribution of pores with arbitrary shapes that partially overlap. Up to a 15% reduction of the thermal conductivity with respect to the purely circular pores was predicted for a porous membrane with 37% filling fraction. The effect of the pore shape and distribution was further studied. Maps of temperature and heat flux distributions clearly showed that for particular pore placement heat transport can be efficiently blocked and hot spots can be found in narrow channels between pores. These findings have an impact on the fabrication of membrane-based thermoelectric devices, where low thermal conductivity is required. This work shows that for porous membranes with a given filling fraction the thermal conductivity can be further modified by introducing disorder in the shape and placement of the pores.
publishDate 2019
dc.date.none.fl_str_mv 2019
2020
2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/201149
url http://hdl.handle.net/10261/201149
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
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#PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/EC/H2020/694977
SEV-2017-0706/AEI/10.13039/501100011033
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/SEV-2017-0706
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2015-70862-P
https://doi.org/10.1088/1361-6528/ab0ecd
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv IOP Publishing
publisher.none.fl_str_mv IOP Publishing
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
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