Please use this identifier to cite or link to this item: https://doi.org/10.1021/nl403750s
Title: Extreme low thermal conductivity in nanoscale 3D Si phononic crystal with spherical pores
Authors: Yang, L.
Yang, N.
Li, B. 
Keywords: molecular dynamics
phonon localization
Phononic crystal
thermal conductivity
thermoelectric material
thermoelectrics
Issue Date: 9-Apr-2014
Citation: Yang, L., Yang, N., Li, B. (2014-04-09). Extreme low thermal conductivity in nanoscale 3D Si phononic crystal with spherical pores. Nano Letters 14 (4) : 1734-1738. ScholarBank@NUS Repository. https://doi.org/10.1021/nl403750s
Abstract: In this work, we propose a nanoscale three-dimensional (3D) Si phononic crystal (PnC) with spherical pores, which can reduce the thermal conductivity of bulk Si by a factor up to 10,000 times at room temperature. Thermal conductivity of Si PnCs depends on the porosity, for example, the thermal conductivity of Si PnCs with porosity 50% is 300 times smaller than that of bulk Si. The phonon participation ratio spectra demonstrate that more phonons are localized as the porosity increases. The thermal conductivity is insensitive to the temperature changes from room temperature to 1100 K. The extreme-low thermal conductivity could lead to a larger value of ZT than unity as the periodic structure affects very little the electric conductivity. © 2014 American Chemical Society.
Source Title: Nano Letters
URI: http://scholarbank.nus.edu.sg/handle/10635/96583
ISSN: 15306992
DOI: 10.1021/nl403750s
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