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Title: Size effects on the thermal conductivity of amorphous silicon thin films

Abstract

In this study, we investigate thickness-limited size effects on the thermal conductivity of amorphous silicon thin films ranging from 3 to 1636 nm grown via sputter deposition. While exhibiting a constant value up to ~100 nm, the thermal conductivity increases with film thickness thereafter. The thickness dependence we demonstrate is ascribed to boundary scattering of long wavelength vibrations and an interplay between the energy transfer associated with propagating modes (propagons) and nonpropagating modes (diffusons). A crossover from propagon to diffuson modes is deduced to occur at a frequency of ~1.8 THz via simple analytical arguments. These results provide empirical evidence of size effects on the thermal conductivity of amorphous silicon and systematic experimental insight into the nature of vibrational thermal transport in amorphous solids.

Authors:
;  [1];  [1];  [2];  [2];  [1];  [2];  [1];  [1];  [1]
  1. Univ. of Virginia, Charlottesville, VA (United States)
  2. Univ. of New Mexico, Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1251626
Alternate Identifier(s):
OSTI ID: 1245039
Report Number(s):
SAND-2015-6735J
Journal ID: ISSN 2469-9950; PRBMDO; 598864
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 14; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Thomas Edwin Beechem, Braun, Jeffrey L., Baker, Christopher H., Elahi, Miraz, Artyushkova, Kateryna, Norris, Pamela M., Leseman, Zayd Chad, Gaskins, John T., Hopkins, Patrick E., and Giri, Ashutosh. Size effects on the thermal conductivity of amorphous silicon thin films. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.140201.
Thomas Edwin Beechem, Braun, Jeffrey L., Baker, Christopher H., Elahi, Miraz, Artyushkova, Kateryna, Norris, Pamela M., Leseman, Zayd Chad, Gaskins, John T., Hopkins, Patrick E., & Giri, Ashutosh. Size effects on the thermal conductivity of amorphous silicon thin films. United States. doi:10.1103/PhysRevB.93.140201.
Thomas Edwin Beechem, Braun, Jeffrey L., Baker, Christopher H., Elahi, Miraz, Artyushkova, Kateryna, Norris, Pamela M., Leseman, Zayd Chad, Gaskins, John T., Hopkins, Patrick E., and Giri, Ashutosh. Fri . "Size effects on the thermal conductivity of amorphous silicon thin films". United States. doi:10.1103/PhysRevB.93.140201. https://www.osti.gov/servlets/purl/1251626.
@article{osti_1251626,
title = {Size effects on the thermal conductivity of amorphous silicon thin films},
author = {Thomas Edwin Beechem and Braun, Jeffrey L. and Baker, Christopher H. and Elahi, Miraz and Artyushkova, Kateryna and Norris, Pamela M. and Leseman, Zayd Chad and Gaskins, John T. and Hopkins, Patrick E. and Giri, Ashutosh},
abstractNote = {In this study, we investigate thickness-limited size effects on the thermal conductivity of amorphous silicon thin films ranging from 3 to 1636 nm grown via sputter deposition. While exhibiting a constant value up to ~100 nm, the thermal conductivity increases with film thickness thereafter. The thickness dependence we demonstrate is ascribed to boundary scattering of long wavelength vibrations and an interplay between the energy transfer associated with propagating modes (propagons) and nonpropagating modes (diffusons). A crossover from propagon to diffuson modes is deduced to occur at a frequency of ~1.8 THz via simple analytical arguments. These results provide empirical evidence of size effects on the thermal conductivity of amorphous silicon and systematic experimental insight into the nature of vibrational thermal transport in amorphous solids.},
doi = {10.1103/PhysRevB.93.140201},
journal = {Physical Review B},
number = 14,
volume = 93,
place = {United States},
year = {2016},
month = {4}
}

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Cited by: 14 works
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    Works referencing / citing this record:

    On the Steady-State Temperature Rise During Laser Heating of Multilayer Thin Films in Optical Pump–Probe Techniques
    journal, February 2018

    • Braun, Jeffrey L.; Szwejkowski, Chester J.; Giri, Ashutosh
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    Boron anomaly in the thermal conductivity of lithium borate glasses
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    On the Steady-State Temperature Rise During Laser Heating of Multilayer Thin Films in Optical Pump–Probe Techniques
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