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Main Title: Thermal conductivity and air-mediated losses in periodic porous silicon membranes at high temperatures
Author(s): Graczykowski, Bartlomiej
Sachat, Alexandros el
Reparaz, Juan Sebastián
Sledzinska, Marianna
Wagner, Markus R.
Chávez-Ángel, Emigdio
Wu, Y.
Volz, Sebastian
Alzina, Francesc
Sotomayor Torres, Clivia M.
Type: Article
Language Code: en
Abstract: Heat 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.
Issue Date: 4-Sep-2017
Date Available: 4-May-2020
DDC Class: 530 Physik
Subject(s): nanoscale material
heat dissipation
thermal conductivity
high temperatures
Sponsor/Funder: EC/FP7/309150/EU/Membrane-based phononic engineering for energy harvesting/MERGING
EC/FP7/604668/EU/QUANTItative scanning probe microscopy techniques for HEAT transfer management in nanomaterials and nanodevices/QUANTIHEAT
Journal Title: Nature Communications
Publisher: Springer Nature
Publisher Place: London
Volume: 8
Article Number: 415
Publisher DOI: 10.1038/s41467-017-00115-4
EISSN: 2041-1723
Appears in Collections:FG Optische Charakterisierung von Halbleitern » Publications

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