Cited by 129Thermal properties of materialsAdvanced Thermoelectric Materials and DevicesMetal and Thin Film Mechanics

Thermal conductivity of (Zr,W)N/ScN metal/semiconductor multilayers and superlattices

Rawat, Vijay, Koh, Yee Kan, Cahill, David G., Sands, Timothy D.·2009·Journal of Applied Physics

Abstract

The cross-plane thermal conductivities of metal/semiconductor multilayers and epitaxial superlattices have been measured as a function of period by time-domain thermoreflectance at room temperature. (001)-oriented ZrN (metal)/ScN (semiconductor) multilayers and (Zr,W)N/ScN epitaxial superlattices with the rocksalt crystal structure were grown on (001)MgO substrates by reactive magnetron sputtering. A distinct minimum in thermal conductivity at a period of ∼6 nm is observed for ZrN/ScN multilayers. The minimum thermal conductivity of 5.25 W/m K is a factor of ∼2.7 smaller than the mean of the thermal conductivities (including only the lattice contributions) of the values measured for films of the constituent materials, and approximately equal to the lattice component of the thermal conductivity of a Zr0.65Sc0.35N alloy film (∼5 W/m K). Alloying the ZrN layers with WNx reduces the lattice mismatch, yielding epitaxial (Zr,W)N/ScN superlattices. The addition of WNx also reduces the thermal conductivity to ∼2 W/m K, a value that is sufficiently low to suggest promise for these materials as solid-state thermionic generators.

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Crossref · 10.1063/1.3065092

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Authors
Rawat, V., Koh, Y. K., Cahill, D. G., & Sands, T. D.
Affiliations
  • Purdue University West Lafayette (US)
  • University of Illinois Urbana-Champaign (US)
Venue
Journal of Applied Physics
Published
2009-01-15
Volume
105
Issue
2
ISSN
  • 0021-8979 (ISSN-L)
  • 1089-7550
OpenAlex
W2018333973
Cited by
129
References
39
Citations by year
2026: 3 · 2025: 5 · 2024: 3 · 2023: 7 · 2022: 5 · 2021: 7 · 2020: 4 · 2019: 13 · 2018: 10 · 2017: 12 · 2016: 9 · 2015: 7 · 2014: 9 · 2013: 13 · 2012: 4
FWCI
3.54
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Applied Physics (publishedVersion)
  • Purdue e-Pubs (Purdue University System) (submittedVersion)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Thermal properties of materials
  • Physical Sciences › Materials Science › Materials Chemistry › Advanced Thermoelectric Materials and Devices
  • Physical Sciences › Engineering › Mechanics of Materials › Metal and Thin Film Mechanics
Keywords
thermal conductivity, epitaxial superlattices, scandium nitride, zirconium nitride, lattice mismatch, time-domain thermoreflectance, reactive magnetron sputtering, MgO substrate

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