HEAT CONDUCTION IN SI/GE SUPERLATTICES: A MOLECULAR DYNAMICS STUDY

Ji, Pengfei1; Rong, Yiming1; Zhang, Yuwen2; Tang, Yong3

10.1115/IMECE2017-70270

2018

PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2017 VOL 8

8

Tampa, FL, United states

THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA

AMER SOC MECHANICAL ENGINEERS

Owing to the exceptional low thermal conductivity, Si/Ge superlattices becomes an attractive thermoelectric material to convert thermal energy into electric power. The heat conduction process in Si/Ge superlattices is studied by employing the molecular dynamics (MD) simulation in this paper. For the purpose of investigating the role of Si and Ge interface to the contribution of overall thermal conductivity reduction in Si/Ge superlattices, convergent and divergent cone nanostructures are designed as interfaces between Si layer and Ge layer. By keeping fixed temperature difference between the left and right sides of Si/Ge superlattices with constant length, the spatial distribution of temperature and temporal evolution of heat flux flowing through Si/Ge superlattices are calculated. Comparing with the Si/Ge superlattices with even interface, the nanostructured interface contributes to impede the heat conduction between Si and Ge atoms. Si/Ge superlattices with divergent cone interface presents the most excellent performance among all the simulated cases. The design of nanostructured interface paves a promising path to enhance the efficiency of Si/Ge thermoelectric material.

第一 ; 通讯

英语

CPCI-S ; EI

Postdoctoral Science Foundation of China[2017M612653]

Thermodynamics ; Engineering

Thermodynamics ; Engineering, Mechanical

WOS:000428485700071

20180504684348

Heat conduction ; Heat flux ; Interfaces (materials) ; Molecular dynamics ; Nanostructures ; Thermal conductivity ; Thermoelectric equipment

Thermoelectric Energy:615.4 ; Thermodynamics:641.1 ; Heat Transfer:641.2 ; Nanotechnology:761 ; Physical Chemistry:801.4 ; Solid State Physics:933 ; Materials Science:951

Web of Science

1.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China
2.Univ Missouri, Dept Mech & Aerosp Engn, Columbia, MO 65211 USA
3.South China Univ Technol, Sch Mech & Automot Engn, Guang Dong Higher Educ Inst, Key Lab Surface Funct Struct Mfg, Guangzhou 510640, Guangdong, Peoples R China

Ji, Pengfei,Rong, Yiming,Zhang, Yuwen,et al. HEAT CONDUCTION IN SI/GE SUPERLATTICES: A MOLECULAR DYNAMICS STUDY[C]. THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA:AMER SOC MECHANICAL ENGINEERS,2018.