The Library
Enhanced phonon boundary scattering at high temperatures in hierarchically disordered nanostructures
Tools
Chakraborty, Dhritiman, de Sousa Oliveira, Laura and Neophytou, Neophytos (2019) Enhanced phonon boundary scattering at high temperatures in hierarchically disordered nanostructures. Journal of Electronic Materials, 48 . pp. 1909-1916. doi:10.1007/s11664-019-06959-4 ISSN 0361-5235.
|
PDF
WRAP-enhanced-phonon-boundary-scattering-high-temperatures-Neophytou-2019.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (1502Kb) | Preview |
Official URL: http://dx.doi.org/10.1007/s11664-019-06959-4
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.
Item Type: | Journal Article | ||||||||
---|---|---|---|---|---|---|---|---|---|
Subjects: | Q Science > QC Physics | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||
Library of Congress Subject Headings (LCSH): | Phonons -- Scattering, Nanostructures | ||||||||
Journal or Publication Title: | Journal of Electronic Materials | ||||||||
Publisher: | Springer New York LLC | ||||||||
ISSN: | 0361-5235 | ||||||||
Official Date: | 15 April 2019 | ||||||||
Dates: |
|
||||||||
Volume: | 48 | ||||||||
Page Range: | pp. 1909-1916 | ||||||||
DOI: | 10.1007/s11664-019-06959-4 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Description: | International Conference on Thermoelectrics 2018 |
||||||||
Date of first compliant deposit: | 18 February 2019 | ||||||||
Date of first compliant Open Access: | 19 February 2019 | ||||||||
RIOXX Funder/Project Grant: |
|
Request changes or add full text files to a record
Repository staff actions (login required)
View Item |
Downloads
Downloads per month over past year