材料科学
纳米线
热电效应
热导率
声子
多孔性
热电材料
散射
热传导
声子散射
凝聚态物理
多孔硅
光电子学
无定形固体
热的
纳米技术
复合材料
光学
结晶学
物理
化学
热力学
作者
Guiping Zhu,C. Y. Zhao,Xiwen Wang,Jian Wang
标识
DOI:10.1088/0256-307x/38/2/024401
摘要
Tuning the thermal conductivity of silicon nanowires (Si-NWs) is essential for realization of future thermoelectric devices. The corresponding management of thermal transport is strongly related to the scattering of phonons, which are the primary heat carriers in Si-NWs. Using the molecular dynamics method, we find that the scattering of phonons from internal body defects is stronger than that from surface structures in the low-porosity range. Based on our simulations, we propose the concept of an exponential decay in thermal conductivity with porosity, specifically in the low-porosity range. In contrast, the thermal conductivity of Si-NWs with a higher porosity approaches the amorphous limit, and is insensitive to specific phonon scattering processes. Our findings contribute to a better understanding of the tuning of thermal conductivity in Si-NWs by means of patterned nanostructures, and may provide valuable insights into the optimal design of one-dimensional thermoelectric materials.
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