As the particle size in nanocomposites approaches the order of several nanometers that is comparable with the phonon wavelength, the phonon wave interference and particle scattering effect will lead to a much more complicated energy transport. This letter reports the investigation of phonon interference and scattering in Si/Ge nanocomposites by the phonon wave packet simulation. The particle size, particle layer number, and particle shape effects on the phonon transmission are considered. For both cubic and spherical particles, the phonon transmission coefficient fluctuates obviously with the increasing particle size and there are local peaks and valleys of transmission coefficient at certain particle sizes. The transmission decreases with the increasing layers of particle. The optical multi-layer transmission model can be applied to predict the transmission coefficient of Si/Ge nanocomposites with layered particles. The enhancement of thermal conductance is up to 19.1% due to the phonon interference effect.
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18 May 2015
Research Article|
May 20 2015
Detecting the phonon interference effect in Si/Ge nanocomposite by wave packets
Shenghong Ju;
Shenghong Ju
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics,
Tsinghua University
, Beijing 100084, China
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Xingang Liang
Xingang Liang
a)
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics,
Tsinghua University
, Beijing 100084, China
Search for other works by this author on:
a)
Electronic mail: liangxg@tsinghua.edu.cn. Tel./Fax: +86-10-62788702.
Appl. Phys. Lett. 106, 203107 (2015)
Article history
Received:
February 22 2015
Accepted:
May 12 2015
Citation
Shenghong Ju, Xingang Liang; Detecting the phonon interference effect in Si/Ge nanocomposite by wave packets. Appl. Phys. Lett. 18 May 2015; 106 (20): 203107. https://doi.org/10.1063/1.4921576
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