Thermal transport in nanoporous holey silicon membranes investigated with optically induced transient thermal gratings
Duncan, Ryan A. (Massachusetts Institute of Technology. Department of Chemistry)
Romano, Giuseppe (Massachusetts Institute of Technology. Department of Mechanical Engineering)
Sledzinska, Marianna (Institut Català de Nanociència i Nanotecnologia)
Maznev, Alexei A. (Massachusetts Institute of Technology. Department of Chemistry)
Péraud, Jean-Philippe M. (Lawrence Berkeley National Laboratory. Computational Research Division)
Hellman, Olle (California Institute of Technology. Department of Applied Physics and Materials Science)
Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia)
Nelson, Keith A. (Massachusetts Institute of Technology. Department of Chemistry)

Fecha:	2020
Resumen:	In this study, we use transient thermal gratings-a non-contact, laser-based thermal metrology technique with intrinsically high accuracy-to investigate room-temperature phonon-mediated thermal transport in two nanoporous holey silicon membranes with limiting dimensions of 120 nm and 250 nm, respectively. We compare the experimental results with ab initio calculations of phonon-mediated thermal transport according to the phonon Boltzmann transport equation (BTE) using two different computational techniques. We find that the calculations conducted within the Casimir framework, i. e. , based on the BTE with the bulk phonon dispersion and diffuse scattering from surfaces, are in quantitative agreement with the experimental data and thus conclude that this framework is adequate for describing phonon-mediated thermal transport in silicon nanostructures with feature sizes of the order of 100 nm.
Ayudas:	Agencia Estatal de Investigación SEV-2017-0706 Ministerio de Ciencia e Innovación PGC2018-101743-B-I00 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-806
Nota:	Altres ajuts: ICN2 is supported by the CERCA Programme/Generalitat de Catalunya.
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió acceptada per publicar
Materia:	Nonequilibrium statistical mechanics ; Thermal conductivity ; Computational methods ; Ab-initio methods ; Phonons ; Nanomaterials ; Thermal transport ; Laser optics
Publicado en:	Journal of applied physics, Vol. 128, issue 23 (Dec. 2020) , art. 235106, ISSN 1089-7550

DOI: 10.1063/1.5141804

Postprint 21 p, 1.9 MB

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Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > Institut Català de Nanociència i Nanotecnologia (ICN2)
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