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Enhanced Phonon Boundary Scattering at High Temperatures in Hierarchically Disordered Nanostructures

  • Dhritiman ChakrabortyEmail author
  • Laura de Sousa Oliveira
  • Neophytos Neophytou
Open Access
Topical Collection: International Conference on Thermoelectrics 2018
  • 32 Downloads
Part of the following topical collections:
  1. International Conference on Thermoelectrics 2018

Abstract

Boundary scattering in hierarchically disordered nanomaterials is an effective way to reduce the thermal conductivity of thermoelectric materials and increase their performance. In this work, we investigate thermal transport in silicon-based nanostructured materials in the presence of nanocrystallinity and nanopores at the range of 300–900 K using a Monte Carlo simulation approach. The thermal conductivity in the presence of nanocrystallinity follows the same reduction trend as in the pristine material. We show, however, that the relative reduction is stronger with temperature in the presence of nanocrystallinity, a consequence of the wavevector-dependent (q-dependent) nature of phonon scattering on the domain boundaries. In particular, as the temperature is raised, the proportion of large wavevector phonons increases. Since these phonons are more susceptible to boundary scattering, we show that this q-dependent surface scattering could account for as much as a ∼ 40% reduction in the thermal conductivity of nanocrystalline Si. The introduction of nanopores with randomized positions magnifies this effect, which suggests that hierarchical nanostructuring is actually more effective at high temperatures than previously thought.

Keywords

Thermal conductivity phonon transport boundary scattering thermoelectrics nanotechnology nanocrystalline silicon Monte Carlo simulations 

Notes

Acknowledgments

This work has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 Research and Innovation Programme (Grant Agreement No. 678763). The authors would also like to thank Dr. Patrizio Graziosi at the University of Warwick for useful discussions.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  1. 1.School of EngineeringUniversity of WarwickCoventryUK

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