Journal
APPLIED SURFACE SCIENCE
Volume 396, Issue -, Pages 1164-1169Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2016.11.105
Keywords
Heavy group-IV sheet; Thermal transport property; First-principles BTE calculation
Categories
Funding
- National Natural Science Foundation of China [11474081]
- Zhejiang Provincial Natural Science Foundation of China [LY15A040008]
- Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund
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Thermal transport properties of nanomaterials are essential for their nanodevices and nano-energy applications. Here, utilizing first-principles calculation with the Boltzmann transport equation, we investigate the lattice thermal conductivities and thermoelectric performances of SnSi and SnGe sheets. Their room-temperature lattice thermal conductivities ( kappa(lat)) are found in the magnitude of 5-12 W/mK, which are smaller than the values in elemental silicene, germanene, and stanene sheets. A long phonon mean free path limitation is found for the SnSi system, which causes a ballistic thermal transport in its finite microscale samples, while for the SnGe one, it will still exhibit a diffusive feature instead. Accompanied with the low kappa(lat), their figures of merit are estimated to exceed one in the wide temperature range of 350-800 K, where the peak value can arrive at 1.47 and 1.64 for SnSi and SnGe sheets, respectively. Those merits of thermal transport properties will enable intriguing thermoelectric and other sustain-energy applications for binary SnSi and SnGe systems. (C) 2016 Elsevier B. V. All rights reserved.
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