DOI: 10.1063/1.2894907. Unusually low thermal conductivity of gallium nitride nanowires [Penn]

Unusually low thermal conductivity of gallium nitride nanowires

10.1063/1.2894907

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

We report measurements of thermal conductivity κ on individual gallium nitride nanowires (GaN NWs) with diameters ranging from 97to181nm grown by thermal chemical vapor deposition. We observed unexpectedly small κ values, in the range of 13–19W∕mK at 300K, with very weak diameter dependence. We also observe unusual power law κ∼Tn behavior with n=1.8 at low temperature. Electron-energy-loss-spectroscopy measurements indicate Si and O concentrations in the ranges of 0.1–1 and 0.01–0.1at.%, respectively. Based on extensive numerical calculations, we conclude that both the unexpectedly low κ and the T1.8 dependence are caused by unusually large mass-difference scattering, primarily from Si impurities. Our analysis also suggests that mass-difference scattering rates are significantly enhanced by the reduced phonon group velocity in nanoscale systems. Planar defects running the length of the NW, previously characterized in detail, may also play a role in limiting the phonon mean free path.

Bibliography

Guthy, C., Nam, C.-Y., & Fischer, J. E. (2008). Unusually low thermal conductivity of gallium nitride nanowires. Journal of Applied Physics, 103(6).

Authors 3

Csaba Guthy (first)
Chang-Yong Nam (additional)
John E. Fischer (additional)

References 47 Referenced 92

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Dates

Type	When
Created	17 years, 4 months ago (March 29, 2008, 3:54 a.m.)
Deposited	2 years, 1 month ago (June 30, 2023, 2:12 p.m.)
Indexed	3 weeks, 6 days ago (July 30, 2025, 6:51 a.m.)
Issued	17 years, 5 months ago (March 15, 2008)
Published	17 years, 5 months ago (March 15, 2008)
Published Online	17 years, 4 months ago (March 28, 2008)
Published Print	17 years, 5 months ago (March 15, 2008)

Funders 0

None

BibTeX

@article{Guthy_2008, title={Unusually low thermal conductivity of gallium nitride nanowires}, volume={103}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.2894907}, DOI={10.1063/1.2894907}, number={6}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Guthy, Csaba and Nam, Chang-Yong and Fischer, John E.}, year={2008}, month=mar }

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  "URL": "http://dx.doi.org/10.1063/1.2894907",
  "relation": {},
  "ISSN": [
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    "1089-7550"
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  "subject": [],
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}