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:
-
- Univ. of Virginia, Charlottesville, VA (United States)
- 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. https://doi.org/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. https://doi.org/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 = {Fri Apr 01 00:00:00 EDT 2016},
month = {Fri Apr 01 00:00:00 EDT 2016}
}
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