High Thermal Conductivity of a Hydrogenated Amorphous Silicon Film
Abstract
We measured the thermal conductivity kappa of an 80 microm thick hydrogenated amorphous silicon film prepared by hot-wire chemical-vapor deposition with the 3omega (80-300 K) and the time-domain thermo-reflectance (300 K) methods. The kappa is higher than any of the previous temperature dependent measurements and shows a strong phonon mean free path dependence. We also applied a Kubo based theory using a tight-binding method on three 1000 atom continuous random network models. The theory gives higher kappa for more ordered models, but not high enough to explain our results, even after extrapolating to lower frequencies with a Boltzmann approach. Our results show that this material is more ordered than any amorphous silicon previously studied.
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More recent simulations and experiments have also pointed to the existence of long mean free path phonon-like modes in a-Si.
“More recent simulations and experiments have also pointed to the existence of long MFP phonon-like modes in a-Si 34,[36][37][38] .”
From Broadband phonon mean free path contributions to thermal conductivity measured using frequency domain thermoreflectance (2013) · cites this paper as [34]
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Regner, K. T., Sellan, D. P., Su, Z., Amon, C. H., McGaughey, A. J. H., & Malen, J. A. (2013) · Nature Communications · doi:10.1038/ncomms2630 · Cited by 646 · see citing works
Pernot, G., Stoffel, M., Savic, I., Pezzoli, F., Chen, P., Savelli, G., Jacquot, A., Schumann, J., Denker, U., Mönch, I., et al. (2010) · Nature Materials · doi:10.1038/nmat2752 · Cited by 375 · see citing works
Nonlocal theory for heat transport at high frequencies
Koh, Y. K., Cahill, D. G., & Sun, B. (2014) · Physical Review B · doi:10.1103/physrevb.90.205412 · Cited by 60 · see citing works
Self-citation
- Authors
- Liu, X., Feldman, J. L., Cahill, D. G., Crandall, R. S., Bernstein, N., Photiadis, D. M., Mehl, M. J., & Papaconstantopoulos, D. A.
- Affiliations
- United States Naval Research Laboratory (US)
- University of Illinois Urbana-Champaign (US)
- National Laboratory of the Rockies (US)
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2009-01-21
- Volume
- 102
- Issue
- 3
- Pages
- 035901-035901
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2015308619
- Cited by
- 84
- References
- 0
- Citations by year
- 2026: 2 · 2025: 4 · 2024: 6 · 2023: 4 · 2022: 6 · 2021: 9 · 2020: 6 · 2019: 3 · 2018: 3 · 2017: 9 · 2016: 4 · 2015: 5 · 2014: 7 · 2013: 3 · 2012: 1
- FWCI
- 2.09
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Physical Review Letters (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Thermal properties of materials
- Physical Sciences › Materials Science › Materials Chemistry › Material Dynamics and Properties
- Physical Sciences › Engineering › Mechanics of Materials › Thermography and Photoacoustic Techniques
- Keywords
- hydrogenated amorphous silicon, thermal conductivity, phonon mean free path, hot filament chemical vapor deposition, random network model, tight-binding model, Kubo theory, phonon transport
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