Thermal conductivity and air-mediated losses in periodic porous silicon membranes at high temperatures

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dc.contributor.authorGraczykowski, Bartlomiej
dc.contributor.authorSachat, Alexandros el
dc.contributor.authorReparaz, Juan Sebastián
dc.contributor.authorSledzinska, Marianna
dc.contributor.authorWagner, Markus R.
dc.contributor.authorChávez-Ángel, Emigdio
dc.contributor.authorWu, Y.
dc.contributor.authorVolz, Sebastian
dc.contributor.authorAlzina, Francesc
dc.contributor.authorSotomayor Torres, Clivia M.
dc.date.accessioned2020-05-04T08:16:29Z
dc.date.available2020-05-04T08:16:29Z
dc.date.issued2017-09-04
dc.description.abstractHeat conduction in silicon can be effectively engineered by means of sub-micrometre porous thin free-standing membranes. Tunable thermal properties make these structures good candidates for integrated heat management units such as waste heat recovery, rectification or efficient heat dissipation. However, possible applications require detailed thermal characterisation at high temperatures which, up to now, has been an experimental challenge. In this work we use the contactless two-laser Raman thermometry to study heat dissipation in periodic porous membranes at high temperatures via lattice conduction and air-mediated losses. We find the reduction of the thermal conductivity and its temperature dependence closely correlated with the structure feature size. On the basis of two-phonon Raman spectra, we attribute this behaviour to diffuse (incoherent) phonon-boundary scattering. Furthermore, we investigate and quantify the heat dissipation via natural air-mediated cooling, which can be tuned by engineering the porosity.en
dc.description.sponsorshipEC/FP7/309150/EU/Membrane-based phononic engineering for energy harvesting/MERGINGen
dc.description.sponsorshipEC/FP7/604668/EU/QUANTItative scanning probe microscopy techniques for HEAT transfer management in nanomaterials and nanodevices/QUANTIHEATen
dc.identifier.eissn2041-1723
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/11071
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-9959
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subject.ddc530 Physikde
dc.subject.othernanoscale materialen
dc.subject.otherthermodynamicen
dc.subject.otherheat dissipationen
dc.subject.otherthermal conductivityen
dc.subject.otherhigh temperaturesen
dc.titleThermal conductivity and air-mediated losses in periodic porous silicon membranes at high temperaturesen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.articlenumber415en
dcterms.bibliographicCitation.doi10.1038/s41467-017-00115-4en
dcterms.bibliographicCitation.journaltitleNature Communicationsen
dcterms.bibliographicCitation.originalpublishernameSpringer Natureen
dcterms.bibliographicCitation.originalpublisherplaceLondonen
dcterms.bibliographicCitation.volume8en
tub.accessrights.dnbfreeen
tub.affiliationFak. 2 Mathematik und Naturwissenschaften::Inst. Festkörperphysik::FG Optische Charakterisierung von Halbleiternde
tub.affiliation.facultyFak. 2 Mathematik und Naturwissenschaftende
tub.affiliation.groupFG Optische Charakterisierung von Halbleiternde
tub.affiliation.instituteInst. Festkörperphysikde
tub.publisher.universityorinstitutionTechnische Universität Berlinen

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