Title

Effect of Grain Boundary Angle on the Thermal Conductivity of Nanostructured Bicrystal ZnO based on the Molecular Dynamics Simulation Method

Abstract

ZnO is a widely used semiconductor material due to its excellent physical and mechanical properties. The thermal transport behavior across a single grain boundary (GB) of bicrystal ZnO with varying tilt angles from 5.45° to 67.38° was investigated using a nonequilibrium molecular dynamics simulation. The GB energy and Kapitza resistance as a function of tilt angle were determined and parameters of the extended Read-Shockley model were calculated. The Kapitza resistance varied monotonically with a GB angle < 36° and was nearly constant when the angle was > 36°. Furthermore, effective thermal conductivity and Kapitza resistance were found to depend strongly on the sample length and temperature. Finally, we compared the phonon density of states of the two types of GBs and found a mismatch in the low frequency that might explain the effect of the GBs structures on heat conduction.

Department(s)

Physics

Comments

The authors gratefully acknowledge funding support from the National Natural Science Foundation of China (51576066, 51301069), Natural Science Foundation of Hebei Province (E2014502073), and the Fundamental Research Funds for the Central Universities (2017MS123).

Keywords and Phrases

Grain Boundary; Kapitza Resistance; Phonon Density Of States; Thermal Conductivity

International Standard Serial Number (ISSN)

0017-9310

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2019 Elsevier Ltd, All rights reserved.

Publication Date

01 Dec 2019

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