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Title: Investigation of phonon coherence and backscattering using silicon nanomeshes

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms14054· OSTI ID:1379671
 [1];  [2];  [3];  [4];  [4];  [4];  [3];  [4];  [5]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Irvine, CA (United States). Dept. of Mechanical and Aerospace Engineering
  2. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry
  3. Univ. of California, Berkeley, CA (United States). Dept. of Mechanical Engineering
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
  5. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry, Dept. of Materials Science and Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Kavli Energy NanoScience Inst., Berkeley, CA (United States)

Phonons can display both wave-like and particle-like behaviour during thermal transport. While thermal transport in silicon nanomeshes has been previously interpreted by phonon wave effects due to interference with periodic structures, as well as phonon particle effects including backscattering, the dominant mechanism responsible for thermal conductivity reductions below classical predictions still remains unclear. Here we isolate the wave-related coherence effects by comparing periodic and aperiodic nanomeshes, and quantify the backscattering effect by comparing variable-pitch nanomeshes. We measure identical (within 6% uncertainty) thermal conductivities for periodic and aperiodic nanomeshes of the same average pitch, and reduced thermal conductivities for nanomeshes with smaller pitches. Ray tracing simulations support the measurement results. We conclude phonon coherence is unimportant for thermal transport in silicon nanomeshes with periodicities of 100 nm and higher and temperatures above 14 K, and phonon backscattering, as manifested in the classical size effect, is responsible for the thermal conductivity reduction.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1379671
Journal Information:
Nature Communications, Vol. 8; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 120 works
Citation information provided by
Web of Science

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Cited By (31)

Thermal Transport in 3D Nanostructures journal August 2019
Heat conduction measurements in ballistic 1D phonon waveguides indicate breakdown of the thermal conductance quantization journal October 2018
Ultra-low thermal conductivity of two-dimensional phononic crystals in the incoherent regime journal April 2018
Electron–phonon scattering effect on the lattice thermal conductivity of silicon nanostructures journal January 2017
Reduction of thermal conductivity in silicene nanomesh: insights from coherent and incoherent phonon transport journal January 2018
Impact of thermally dead volume on phonon conduction along silicon nanoladders journal January 2018
Thermal transport through fishbone silicon nanoribbons: unraveling the role of Sharvin resistance journal January 2019
Phonon transport and thermal conductivity of diamond superlattice nanowires: a comparative study with SiGe superlattice nanowires journal January 2020
Investigation of thermal conduction in symmetric and asymmetric nanoporous structures journal December 2017
Modulating thermal conduction via phonon spectral coupling journal September 2018
Reevaluating the suppression function for phonon transport in nanostructures by Monte Carlo techniques journal January 2019
Towards ultimate impedance of phonon transport by nanostructure interface journal January 2019
Electron Monte Carlo simulations of nanoporous Si thin films—The influence of pore-edge charges journal February 2019
Effects of metal silicide inclusion interface and shape on thermal transport in silicon nanocomposites journal July 2019
Modeling ballistic phonon transport from a cylindrical electron beam heat source journal September 2019
Kink as a new degree of freedom to tune the thermal conductivity of Si nanoribbons journal October 2019
Phonon and heat transport control using pillar-based phononic crystals journal August 2018
Geometrical effect of thermal conductivity in 2D silicon films with periodic nanopores journal July 2018
TSV-integrated thermoelectric cooling by holey silicon for hot spot thermal management journal November 2018
Minimizing Coherent Thermal Conductance by Controlling the Periodicity of Two-Dimensional Phononic Crystals journal July 2019
Origins of significant reduction of lattice thermal conductivity in graphene allotropes journal October 2019
Monte Carlo phonon transport simulations in hierarchically disordered silicon nanostructures journal September 2018
Akhiezer mechanism limits coherent heat conduction in phononic crystals journal October 2018
Spectrally Resolved Specular Reflections of Thermal Phonons from Atomically Rough Surfaces journal October 2018
Heat conduction tuning by wave nature of phonons journal August 2017
Radiative metasurface for thermal camouflage, illusion and messaging journal January 2020
Minimizing coherent thermal conductance by controlling the periodicity of two-dimensional phononic crystals text January 2019
Effect of wave versus particle phonon nature in thermal transport through nanostructures journal July 2020
Phonon Conduction in Silicon Nanobeam Labyrinths journal July 2017
Enhancing Thermal Transport in Layered Nanomaterials journal January 2018
Thermal Studies of Nanoporous Si Films with Pitches on the Order of 100 nm —Comparison between Different Pore-Drilling Techniques journal June 2018

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