Influence of surface/interface stress on thermal conductivity of stressed GaN nanofilms

Linli Zhu, Hao Luo
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引用次数: 1

Abstract

This work investigates the effects of surface/interface stress on phonon thermal conductivity of stressed GaN nanofilms theoretically. The elasticity model is applied to describe the phonon dispersion relations of spatially confined GaN nanofilms. The acoustoelastic effects and surface/interface stress effects are accounted for in calculating the phonon properties and thermal conductivity. Theoretical results show that the surface/interface stress can alter significantly the phonon properties such as the phonon dispersion relations, resulting in the modification of thermal conductivity in GaN nanofilms. In addition, the surface/interface stress can change the dependence of thermal conductivity on the prestress fields and temperature. These results can be useful in controlling the thermal conductivity based on the strain/stress engineering in GaN nanostructures-based electronic devices.
表面/界面应力对应力GaN纳米膜导热性的影响
本文从理论上研究了表面/界面应力对应力GaN纳米膜声子热导率的影响。应用弹性模型描述了空间受限氮化镓纳米膜的声子色散关系。在计算声子性质和导热系数时考虑了声弹性效应和表面/界面应力效应。理论结果表明,表面/界面应力可以显著改变声子色散关系等声子性质,从而导致GaN纳米膜导热性的改变。此外,表面/界面应力可以改变导热系数对预应力场和温度的依赖关系。这些结果可用于基于应变/应力工程的氮化镓纳米结构电子器件的热导率控制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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