Effects of surface charges on phonon properties and thermal conductivity in GaN nanofilms

doi:10.1088/1674-1056/28/8/086501

Abstract

Surface charges can modify the elastic modulus of nanostructure, leading to the change of the phonon and thermal properties in semiconductor nanostructure. In this work, the influence of surface charges on the phonon properties and phonon thermal conductivity of GaN nanofilm are quantitatively investigated. In the framework of continuum mechanics, the modified elastic modulus can be derived for the nanofilm with surface charges. The elastic model is presented to analyze the phonon properties such as the phonon dispersion relation, phonon group velocity, density of states of phonons in nanofilm with the surface charges. The phonon thermal conductivity of nanofilm can be obtained by considering surface charges. The simulation results demonstrate that surface charges can significantly change the phonon properties and thermal conductivity in a GaN nanofilm. Positive surface charges reduce the phonon energy and phonon group velocity but increase the density of states of phonons. The surface charges can change the size and temperature dependence of phonon thermal conductivity of GaN nanofilm. Based on these theoretical results, one can adjust the phonon properties and temperature/size dependent thermal conductivity in GaN nanofilm by changing the surface charges.

Keywords: surface charges GaN nanofilm elastic model phonon properties thermal conductivity

Received: 22 May 2019
Revised: 16 June 2019
Accepted manuscript online:

PACS:	65.80.-g	(Thermal properties of small particles, nanocrystals, nanotubes, and other related systems)
	63.22.-m	(Phonons or vibrational states in low-dimensional structures and nanoscale materials)
	43.35.Gk	(Phonons in crystal lattices, quantum acoustics)
	44.10.+i	(Heat conduction)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 11772294, 11621062, and 11302189) and the Fundamental Research Funds for the Central Universities, China (Grant No. 2017QNA4031).

Corresponding Authors: Lin-Li Zhu
E-mail: llzhu@zju.edu.cn

Cite this article:

Shu-Sen Yang(杨树森), Yang Hou(侯阳), Lin-Li Zhu(朱林利) Effects of surface charges on phonon properties and thermal conductivity in GaN nanofilms 2019 Chin. Phys. B 28 086501

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Effects of surface charges on phonon properties and thermal conductivity in GaN nanofilms

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