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Ballistic Phonon Transport in Holey Silicon

Journal Article · · Nano Letters
 [1];  [1];  [2]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Kavli Energy NanoScience Institute, Berkeley, CA (United States); Univ. of California, Irvine, CA (United States)
When the size of semiconductors is smaller than the phonon mean free path, phonons can carry heat with no internal scattering. Ballistic phonon transport has received attention for both theoretical and practical aspects because Fourier's law of heat conduction breaks down and the heat dissipation in nanoscale transistors becomes unpredictable in the ballistic regime. While recent experiments demonstrate room-temperature evidence of ballistic phonon transport in various nanomaterials, the thermal conductivity data for silicon in the length scale of 10-100 nm is still not available due to experimental challenges. In this work, we show ballistic phonon transport prevails in the cross-plane direction of holey silicon from 35 to 200 nm. The thermal conductivity scales linearly with the length (thickness) even though the lateral dimension (neck) is as narrow as 20 nm. We assess the impact of long-wavelength phonons and predict a transition from ballistic to diffusive regime using scaling models. Our results support strong persistence of long-wavelength phonons in nanostructures and are useful for controlling phonon transport for thermoelectrics and potential phononic applications.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1832454
Journal Information:
Nano Letters, Journal Name: Nano Letters Journal Issue: 5 Vol. 15; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (27)

Investigation of phonon coherence and backscattering using silicon nanomeshes journal January 2017
Enhancing Modulation of Thermal Conduction in Vanadium Dioxide Thin Film by Nanostructured Nanogaps journal August 2017
Impact of pore anisotropy on the thermal conductivity of porous Si nanowires journal August 2018
Phononic topological insulators based on six-petal holey silicon structures journal February 2019
Directional Phonon Suppression Function as a Tool for the Identification of Ultralow Thermal Conductivity Materials journal March 2017
Heat guiding and focusing using ballistic phonon transport in phononic nanostructures text January 2016
Thermal Transport in 3D Nanostructures journal August 2019
2D Phononic Crystals: Progress and Prospects in Hypersound and Thermal Transport Engineering journal August 2019
Hollow‐Structured Materials for Thermal Insulation journal July 2018
Heat guiding and focusing using ballistic phonon transport in phononic nanostructures journal May 2017
Ultra-low thermal conductivity of two-dimensional phononic crystals in the incoherent regime journal April 2018
Modelling of thermal transport through a nanocellular polymer foam: toward the generation of a new superinsulating material journal January 2017
Phase-dependent thermal conductivity of electrodeposited antimony telluride films journal January 2018
Role of excess tellurium on the electrical and thermal properties in Te-doped paracostibite journal January 2020
Investigation of thermal conduction in symmetric and asymmetric nanoporous structures journal December 2017
Automatic thermal conductivity measurements with 3-omega technique journal February 2019
Effects of metal silicide inclusion interface and shape on thermal transport in silicon nanocomposites journal July 2019
Phonon-engineered solids constructed from nanocrystals journal August 2019
Kink as a new degree of freedom to tune the thermal conductivity of Si nanoribbons journal October 2019
TSV-integrated thermoelectric cooling by holey silicon for hot spot thermal management journal November 2018
Non-uniaxial stress-assisted fabrication of nanoconstriction on vertical nanostructured Si journal June 2019
Reduction of thermal conductivity by surface scattering of phonons in periodic silicon nanostructures journal January 2016
High-throughput Z T predictions of nanoporous bulk materials as next-generation thermoelectric materials: A material genome approach journal May 2016
Spectral analysis of nonequilibrium molecular dynamics: Spectral phonon temperature and local nonequilibrium in thin films and across interfaces journal May 2017
Influence of amorphous layers on the thermal conductivity of phononic crystals journal March 2018
Monte Carlo phonon transport simulations in hierarchically disordered silicon nanostructures journal September 2018
Phonon-engineered solids constructed from nanocrystals text January 2019

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