Phonon and electron contributions to the thermal conductivity of v Nx epitaxial layers

Qiye Zheng, Antonio B. Mei, Mohit Tuteja, Davide G. Sangiovanni, Lars Hultman, Ivan Petrov, J. E. Greene, David G. Cahill

Research output: Contribution to journalArticle

Abstract

Thermal conductivities of VNx/MgO(001) (0.76≤x≤1.00) epitaxial layers, grown by reactive magnetron sputter deposition, are measured in the temperature range 300<T<1000K using time-domain thermoreflectance (TDTR). Data for the total thermal conductivity are compared to the electronic contribution to the thermal conductivity calculated from the measured electrical conductivity, the Wiedemann-Franz law, and an estimate of the temperature dependence of the Lorenz number L(T). The total thermal conductivity is dominated by electron contribution and varies between 13Wm-1K-1 at x=0.76 and 20Wm-1K-1 at x=1.00 for T=300K and between 25 and 35Wm-1K-1 for T=1000K. The lattice thermal conductivity vs x ranges from 5 to 7Wm-1K-1 at 300 K and decreases by 20% at 500 K. The low magnitude and weak temperature dependence of the lattice thermal conductivity are attributed to strong electron-phonon coupling in VN.

Original languageEnglish (US)
Article number065002
JournalPhysical Review Materials
Volume1
Issue number6
DOIs
StatePublished - Nov 20 2017

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

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    Zheng, Q., Mei, A. B., Tuteja, M., Sangiovanni, D. G., Hultman, L., Petrov, I., Greene, J. E., & Cahill, D. G. (2017). Phonon and electron contributions to the thermal conductivity of v Nx epitaxial layers. Physical Review Materials, 1(6), [065002]. https://doi.org/10.1103/PhysRevMaterials.1.065002