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Heat dissipation in partially perforated phononic nano-membranes with periodicities below 100 nm
- Source :
- APL Materials, APL Materials, 2022, 10 (5), pp.051113. ⟨10.1063/5.0091539⟩
- Publication Year :
- 2022
- Publisher :
- HAL CCSD, 2022.
-
Abstract
- International audience; Understanding how thermal-phonon paths can be shaped is key for controlling heat dissipation at the nanoscale. Thermophononic crystals are periodic porous nanostructures with thermal conductivity deviating from effective medium theory, which is possible if the characteristic sizes are of the order of phonon mean free paths and/or if phonons are forced to flow in privileged directions. We investigate suspended silicon nanomembranes with a periodic array of partially perforated holes of original paraboloid shape, with all characteristic lengths below 100 nm. Results from scanning thermal microscopy, a thermal sensing technique derived from atomic force microscopy, indicate that partial perforation of the membranes impacts heat conduction moderately, with the holey crystals showing a thermal conductivity reduction by a factor 6 in comparison to the bulk and a factor 2.5 in comparison to the non-perforated membrane. The impact of the phononic shapes is analyzed in light of a complementary Monte Carlo ray-tracing estimate of the effective phonon mean free paths that include multiple phonon reflection and highlights phonon backscattering.
- Subjects :
- Scanning thermal microscopy
General Engineering
Phonon scattering
Monte Carlo methods
Effective medium approximation
Phononic Crystals at Various Frequencies
Condensed Matter::Materials Science
[SPI]Engineering Sciences [physics]
Phononic crystal
Thermal conductivity
Phonons
General Materials Science
Thermal transport
Nanomaterials
Subjects
Details
- Language :
- English
- ISSN :
- 2166532X
- Database :
- OpenAIRE
- Journal :
- APL Materials, APL Materials, 2022, 10 (5), pp.051113. ⟨10.1063/5.0091539⟩
- Accession number :
- edsair.doi.dedup.....1b3f5f1d1165d501ad5797fd9ec2fa1c
- Full Text :
- https://doi.org/10.1063/5.0091539⟩