Journal
JOURNAL OF APPLIED PHYSICS
Volume 128, Issue 23, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.5141804
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Funding
- NSF EFRI 2-DARE [EFMA-1542864]
- Solid State Solar-Thermal Energy Conversion Center (S3TEC), an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Office of Basic Science [DE-SC0001299]
- Severo Ochoa Centres of Excellence program - Spanish Research Agency (AEI) [SEV-2017-0706]
- Spanish National Project SIP [PGC2018-101743-B-100]
- AGAUR [2017SGR806]
- VINN Excellence Center for Functional Nanoscale Materials (FunMat-2) [2016-05156]
- Knut and Alice Wallenberg Foundation [2018.0194]
- Caixa Foundation MISTI Global Seed Fund program [LCF/PR/MIT18/11830008]
- CERCA program/Generalitat de Catalunya
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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 120nm and 250nm, 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 100nm.
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