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Title: Investigation of phonon coherence and backscattering using silicon nanomeshes

Abstract

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.

Authors:
 [1];  [2];  [3];  [4];  [4];  [4];  [3];  [4];  [5]
+ Show Author Affiliations
  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)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1379671
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; nanoscale materials; thermodynamics

Citation Formats

Lee, Jaeho, Lee, Woochul, Wehmeyer, Geoff, Dhuey, Scott, Olynick, Deirdre L., Cabrini, Stefano, Dames, Chris, Urban, Jeffrey J., and Yang, Peidong. Investigation of phonon coherence and backscattering using silicon nanomeshes. United States: N. p., 2017. Web. doi:10.1038/ncomms14054.
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Lee, Jaeho, Lee, Woochul, Wehmeyer, Geoff, Dhuey, Scott, Olynick, Deirdre L., Cabrini, Stefano, Dames, Chris, Urban, Jeffrey J., & Yang, Peidong. Investigation of phonon coherence and backscattering using silicon nanomeshes. United States. https://doi.org/10.1038/ncomms14054
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Lee, Jaeho, Lee, Woochul, Wehmeyer, Geoff, Dhuey, Scott, Olynick, Deirdre L., Cabrini, Stefano, Dames, Chris, Urban, Jeffrey J., and Yang, Peidong. Wed . "Investigation of phonon coherence and backscattering using silicon nanomeshes". United States. https://doi.org/10.1038/ncomms14054. https://www.osti.gov/servlets/purl/1379671.
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@article{osti_1379671,
title = {Investigation of phonon coherence and backscattering using silicon nanomeshes},
author = {Lee, Jaeho and Lee, Woochul and Wehmeyer, Geoff and Dhuey, Scott and Olynick, Deirdre L. and Cabrini, Stefano and Dames, Chris and Urban, Jeffrey J. and Yang, Peidong},
abstractNote = {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.},
doi = {10.1038/ncomms14054},
journal = {Nature Communications},
number = ,
volume = 8,
place = {United States},
year = {2017},
month = {1}
}
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https://doi.org/10.1038/ncomms14054
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