Lateral heat flow distribution and defect-dependent thermal resistance in an individual silicon nanowire

Nanotechnology
Seung-Yong LeeSang-Kwon Lee

Abstract

Studies aiming to significantly improve thermal properties, such as figure-of-merit, of silicon nanowires (SiNW) have focused on diameter reduction and surface or interface roughness control. However, the mechanism underlying thermal conductivity enhancement of roughness controlled NWs remains unclear. Here, we report a significant influence of stacking faults (SFs) on the lateral thermal conductivity of a single SiNW, using a combination of newly developed in situ spatially-resolved thermal resistance experiments and high-resolution transmission electron microscopy measurements. We used as-grown SiNWs tapered along the growth direction with progressively lower roughness and SFs density. The results clearly confirmed that both surface roughness and twins or SFs densities suppress the thermal conductivity of an individual SiNW. The results and measurement techniques presented here hold great potential for inspecting minute changes in thermal resistance along an individual SiNW, caused by induced SFs on the nanostructure, and for improving one-dimensional nanowire-based thermoelectric device performance.

References

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Apr 17, 2010·Nano Letters·Peidong YangMelissa Fardy
Dec 15, 2010·Nano Letters·Ziqian WangJohn T L Thong
Nov 23, 2011·Journal of Nanoscience and Nanotechnology·Chan-Yang LeeSang-Kwon Lee

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