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Title: Phonon Conduction in Silicon Nanobeam Labyrinths

Abstract

Here we study single-crystalline silicon nanobeams having 470 nm width and 80 nm thickness cross section, where we produce tortuous thermal paths (i.e. labyrinths) by introducing slits to control the impact of the unobstructed “line-of-sight” (LOS) between the heat source and heat sink. The labyrinths range from straight nanobeams with a complete LOS along the entire length to nanobeams in which the LOS ranges from partially to entirely blocked by introducing slits, s = 95, 195, 245, 295 and 395 nm. The measured thermal conductivity of the samples decreases monotonically from ~47 W m-1K-1 for straight beam to ~31 W m-1 K-1 for slit width of 395 nm. A model prediction through a combination of the Boltzmann transport equation and ab initio calculations shows an excellent agreement with the experimental data to within ~8%. The model prediction for the most tortuous path (s = 395 nm) is reduced by ~14% compared to a straight beam of equivalent cross section. This study suggests that LOS is an important metric for characterizing and interpreting phonon propagation in nanostructures.

Authors:
 [1];  [2];  [3];  [1];  [1]; ORCiD logo [1];  [1];  [1];  [4]; ORCiD logo [5];  [1];  [2];  [1]
  1. Stanford Univ., CA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Stanford Univ., CA (United States); Univ. of Texas, San Antonio, TX (United States)
  4. Stanford Univ., CA (United States); Kyung Hee Univ., Yongin-si (Korea, Republic of)
  5. Purdue Univ., West Lafayette, IN (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Tech., Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1426178
Grant/Contract Number:  
SC0001299
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Park, Woosung, Romano, Giuseppe, Ahn, Ethan C., Kodama, Takashi, Park, Joonsuk, Barako, Michael T., Sohn, Joon, Kim, Soo Jin, Cho, Jungwan, Marconnet, Amy M., Asheghi, Mehdi, Kolpak, Alexie M., and Goodson, Kenneth E. Phonon Conduction in Silicon Nanobeam Labyrinths. United States: N. p., 2017. Web. doi:10.1038/s41598-017-06479-3.
Park, Woosung, Romano, Giuseppe, Ahn, Ethan C., Kodama, Takashi, Park, Joonsuk, Barako, Michael T., Sohn, Joon, Kim, Soo Jin, Cho, Jungwan, Marconnet, Amy M., Asheghi, Mehdi, Kolpak, Alexie M., & Goodson, Kenneth E. Phonon Conduction in Silicon Nanobeam Labyrinths. United States. doi:10.1038/s41598-017-06479-3.
Park, Woosung, Romano, Giuseppe, Ahn, Ethan C., Kodama, Takashi, Park, Joonsuk, Barako, Michael T., Sohn, Joon, Kim, Soo Jin, Cho, Jungwan, Marconnet, Amy M., Asheghi, Mehdi, Kolpak, Alexie M., and Goodson, Kenneth E. Mon . "Phonon Conduction in Silicon Nanobeam Labyrinths". United States. doi:10.1038/s41598-017-06479-3. https://www.osti.gov/servlets/purl/1426178.
@article{osti_1426178,
title = {Phonon Conduction in Silicon Nanobeam Labyrinths},
author = {Park, Woosung and Romano, Giuseppe and Ahn, Ethan C. and Kodama, Takashi and Park, Joonsuk and Barako, Michael T. and Sohn, Joon and Kim, Soo Jin and Cho, Jungwan and Marconnet, Amy M. and Asheghi, Mehdi and Kolpak, Alexie M. and Goodson, Kenneth E.},
abstractNote = {Here we study single-crystalline silicon nanobeams having 470 nm width and 80 nm thickness cross section, where we produce tortuous thermal paths (i.e. labyrinths) by introducing slits to control the impact of the unobstructed “line-of-sight” (LOS) between the heat source and heat sink. The labyrinths range from straight nanobeams with a complete LOS along the entire length to nanobeams in which the LOS ranges from partially to entirely blocked by introducing slits, s = 95, 195, 245, 295 and 395 nm. The measured thermal conductivity of the samples decreases monotonically from ~47 W m-1K-1 for straight beam to ~31 W m-1 K-1 for slit width of 395 nm. A model prediction through a combination of the Boltzmann transport equation and ab initio calculations shows an excellent agreement with the experimental data to within ~8%. The model prediction for the most tortuous path (s = 395 nm) is reduced by ~14% compared to a straight beam of equivalent cross section. This study suggests that LOS is an important metric for characterizing and interpreting phonon propagation in nanostructures.},
doi = {10.1038/s41598-017-06479-3},
journal = {Scientific Reports},
number = 1,
volume = 7,
place = {United States},
year = {2017},
month = {7}
}

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    Works referencing / citing this record:

    Probing ballistic thermal conduction in segmented silicon nanowires
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    • Anufriev, Roman; Gluchko, Sergei; Volz, Sebastian
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