Low thermal conductivity of amorphous Si/Si0.75Ge0.25 multilayer films with Au-interlayers

C. Lin; Z. G. Zeng; F. J. Ye; X. Luo; B. J. Shen; X. P. Zhang; L. C. Dai; Z. Y. Hu

doi:10.1209/0295-5075/105/27003

All issues

Volume 105 / No 2 (January 2014)

EPL, 105 2 (2014) 27003

Abstract

Issue		EPL Volume 105, Number 2, January 2014


Article Number		27003
Number of page(s)		5
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/105/27003
Published online		07 February 2014

EPL, 105 (2014) 27003

Low thermal conductivity of amorphous Si/Si_0.75Ge_0.25 multilayer films with Au-interlayers

C. Lin¹^,2, Z. G. Zeng¹^,2, F. J. Ye¹^,2, X. Luo²^,3, B. J. Shen¹^,2, X. P. Zhang¹^,2, L. C. Dai¹^,2 and Z. Y. Hu¹^,2^,4^(a)

¹ Department of Physics, Shanghai University - Shanghai 200444, China
² Institute of NanoMicroEnergy, Shanghai University - Shanghai 200444, China
³ School of Materials Science and Engineering, Shanghai University - Shanghai 200072, China
⁴ Research Institute of Micro/Nano Science Technology, Shanghai Jiao Tong University - Shanghai 200240, China

^(a) zhiyuhu@shu.edu.cn

Received: 25 October 2013
Accepted: 8 January 2014

Abstract

The cross-plane thermal conductivity of amorphous Si/Si_0.75Ge_0.25 multilayer films with Au-interlayers prepared by magnetron sputtering was successfully measured using a differential $3\omega$ technique at room temperature. Though gold has great thermal conductivity, the samples possess a thermal conductivity of 0.53 W/mK, which is about 50% of the amorphous Si/Si_0.75Ge_0.25 multilayer films. The interfacial thermal resistance is the sum of the phonon-phonon interfacial thermal resistance and the electron-phonon thermal resistance. The thermal conductivity of the samples are significantly determined by the electron-phonon coupling in a metal-nonmetal system and can be lower by choosing a convenient thickness of nonmetal and metal layers.

PACS: 74.25.fc – Electric and thermal conductivity / 68.65.Ac – Multilayers / 71.38.-k – Polarons and electron-phonon interactions

© EPLA, 2014

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