Chin. Phys. Lett.  2021, Vol. 38 Issue (2): 024401    DOI: 10.1088/0256-307X/38/2/024401
Tuning Thermal Conductivity in Si Nanowires with Patterned Structures
Gui-ping Zhu , Chang-wei Zhao , Xi-wen Wang , and Jian Wang*
College of Physical Science and Technology, Yangzhou University, Yangzhou 225002, China
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Gui-ping Zhu , Chang-wei Zhao , Xi-wen Wang  et al  2021 Chin. Phys. Lett. 38 024401
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Abstract 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.
Received: 10 October 2020      Published: 27 January 2021
PACS:  65.80.-g (Thermal properties of small particles, nanocrystals, nanotubes, and other related systems)  
  63.22.-m (Phonons or vibrational states in low-dimensional structures and nanoscale materials)  
  44.10.+i (Heat conduction)  
Fund: Supported by the National Natural Science Foundation of China (Grant No. 11875047).
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Gui-ping Zhu 
Chang-wei Zhao 
Xi-wen Wang 
and Jian Wang
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