Phonon surface scattering controlled length dependence of thermal   conductivity of silicon nanowires

doi:10.1039/c3cp50969a

CORC > 北京大学 > 信息科学技术学院

	Phonon surface scattering controlled length dependence of thermal conductivity of silicon nanowires
	Xie, Guofeng ; Guo, Yuan ; Li, Baohua ; Yang, Liwen ; Zhang, Kaiwang ; Tang, Minghua ; Zhang, Gang
刊名	physical chemistry chemical physics
	2013
关键词	FIELD-EFFECT TRANSISTORS EFFICIENT THERMOELECTRIC-MATERIALS MOLECULAR-DYNAMICS SIMULATION HEAT-CONDUCTION PERFORMANCE TRANSPORT GRAPHENE SI TEMPERATURE CONFINEMENT
DOI	10.1039/c3cp50969a
英文摘要	We present a kinetic model to investigate the anomalous thermal conductivity in silicon nanowires (SiNWs) by focusing on the mechanism of phonon-boundary scattering. Our theoretical model takes into account the anharmonic phonon-phonon scattering and the angle-dependent phonon scattering from the SiNWs surface. For SiNWs with diameter of 27.2 nm, it is found that in the case of specular reflection at lateral boundaries, the thermal conductivity increases as the length increases, even when the length is up to 10 mu m, which is considerably longer than the phonon mean free path (MFP). Thus the phonon-phonon scattering alone is not sufficient for obtaining a normal diffusion in nanowires. However, in the case of purely diffuse reflection at lateral boundaries, the phonons diffuse normally and the thermal conductivity converges to a constant when the length of the nanowire is greater than 100 nm. Our model demonstrates that for observing the length dependence of thermal conductivity experimentally, nanowires with smooth and non-contaminated surfaces, and measuring at low temperature, are preferred.; Chemistry, Physical; Physics, Atomic, Molecular & Chemical; SCI(E); 8; ARTICLE; 35; 14647-14652; 15
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/228052]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	Xie, Guofeng,Guo, Yuan,Li, Baohua,et al. Phonon surface scattering controlled length dependence of thermal conductivity of silicon nanowires[J]. physical chemistry chemical physics,2013.
APA	Xie, Guofeng.,Guo, Yuan.,Li, Baohua.,Yang, Liwen.,Zhang, Kaiwang.,...&Zhang, Gang.(2013).Phonon surface scattering controlled length dependence of thermal conductivity of silicon nanowires.physical chemistry chemical physics.
MLA	Xie, Guofeng,et al."Phonon surface scattering controlled length dependence of thermal conductivity of silicon nanowires".physical chemistry chemical physics (2013).