Reduction of Thermal Conductivity by Nanoscale 3D Phononic Crystal

被引：49

作者：

Yang, Lina ^{[1
,2
]}

Yang, Nuo ^{[3
]}

Li, Baowen ^{[1
,2
,3
,4
]}

机构：

[1] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore

[2] Natl Univ Singapore, Ctr Computat Sci & Engn, Singapore 117542, Singapore

[3] Tongji Univ, Sch Phys Sci & Engn, Ctr Phonon & Thermal Energy Sci, Shanghai 200092, Peoples R China

[4] Natl Univ Singapore, NUS Grad Sch Integrat Sci & Engn, Singapore 117456, Singapore

来源：

SCIENTIFIC REPORTS | 2013年 / 3卷

基金：

中国国家自然科学基金;

关键词：

SIMULATION;

D O I：

10.1038/srep01143

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We studied how the period length and the mass ratio affect the thermal conductivity of isotopic nanoscale three-dimensional (3D) phononic crystal of Si. Simulation results by equilibrium molecular dynamics show isotopic nanoscale 3D phononic crystals can significantly reduce the thermal conductivity of bulk Si at high temperature (1000 K), which leads to a larger ZT than unity. The thermal conductivity decreases as the period length and mass ratio increases. The phonon dispersion curves show an obvious decrease of group velocities in 3D phononic crystals. The phonon's localization and band gap is also clearly observed in spectra of normalized inverse participation ratio in nanoscale 3D phononic crystal.

引用

页数：5

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