Journal
CHINESE PHYSICS LETTERS
Volume 38, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0256-307X/38/2/024401
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Funding
- National Natural Science Foundation of China [11875047]
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Phonon scattering from internal body defects has a stronger impact on thermal conductivity in Si-NWs than that from surface structures in the low-porosity range. Thermal conductivity shows an exponential decay with porosity in the low-porosity range. Si-NWs with higher porosity approach the amorphous limit in thermal conductivity and are insensitive to specific phonon scattering processes.
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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