Thermal conductivity of sputtered amorphous Ge films

Tianzhuo Zhan, Yibin Xu, Masahiro Goto, Yoshihisa Tanaka, Ryozo Kato, Michiko Sasaki, Yutaka Kagawa

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We measured the thermal conductivity of amorphous Ge films prepared by magnetron sputtering. The thermal conductivity was significantly higher than the value predicted by the minimum thermal conductivity model and increased with deposition temperature. We found that variations in sound velocity and Ge film density were not the main factors in the high thermal conductivity. Fast Fourier transform patterns of transmission electron micrographs revealed that short-range order in the Ge films was responsible for their high thermal conductivity. The results provide experimental evidences to understand the underlying nature of the variation of phonon mean free path in amorphous solids.

Original languageEnglish
Article number027126
JournalAIP Advances
Volume4
Issue number2
DOIs
Publication statusPublished - 2014
Externally publishedYes

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thermal conductivity
acoustic velocity
mean free path
magnetron sputtering
electrons
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Zhan, T., Xu, Y., Goto, M., Tanaka, Y., Kato, R., Sasaki, M., & Kagawa, Y. (2014). Thermal conductivity of sputtered amorphous Ge films. AIP Advances, 4(2), [027126]. https://doi.org/10.1063/1.4867122

Thermal conductivity of sputtered amorphous Ge films. / Zhan, Tianzhuo; Xu, Yibin; Goto, Masahiro; Tanaka, Yoshihisa; Kato, Ryozo; Sasaki, Michiko; Kagawa, Yutaka.

In: AIP Advances, Vol. 4, No. 2, 027126, 2014.

Research output: Contribution to journalArticle

Zhan, T, Xu, Y, Goto, M, Tanaka, Y, Kato, R, Sasaki, M & Kagawa, Y 2014, 'Thermal conductivity of sputtered amorphous Ge films', AIP Advances, vol. 4, no. 2, 027126. https://doi.org/10.1063/1.4867122
Zhan T, Xu Y, Goto M, Tanaka Y, Kato R, Sasaki M et al. Thermal conductivity of sputtered amorphous Ge films. AIP Advances. 2014;4(2). 027126. https://doi.org/10.1063/1.4867122
Zhan, Tianzhuo ; Xu, Yibin ; Goto, Masahiro ; Tanaka, Yoshihisa ; Kato, Ryozo ; Sasaki, Michiko ; Kagawa, Yutaka. / Thermal conductivity of sputtered amorphous Ge films. In: AIP Advances. 2014 ; Vol. 4, No. 2.
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