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Title: Minimum thermal conductivity in superlattices: A first-principles formalism

Abstract

The thermal conductivity of silicon-germanium superlattices is computed here from density-functional perturbation theory using relaxation times that include both anharmonic and interface roughness effects. A decrease in the group velocity of low-frequency phonons in addition to the interface-disorder-induced scattering of high-frequency phonons drives the superlattice thermal conductivity to below the alloy limit. At short periods, interplay between decrease in group velocity and increase in phonon lifetimes with increase in superlattice period leads to a minimum in the cross-plane thermal conductivity. Increasing the mass mismatch between the constituent materials in the superlattice further lowers the thermal conductivity below the alloy limit, pointing to avenues for higher efficiency thermoelectric materials.

Authors:
 [1];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Mechanical Engineering
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1160689
Grant/Contract Number:  
SC0001299; FG02-09ER46577
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 87; Journal Issue: 14; Related Information: S3TEC partners with Massachusetts Institute of Technology (lead); Boston College; Oak Ridge National Laboratory; Rensselaer Polytechnic Institute; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Garg, Jivtesh, and Chen, Gang. Minimum thermal conductivity in superlattices: A first-principles formalism. United States: N. p., 2013. Web. doi:10.1103/PhysRevB.87.140302.
Garg, Jivtesh, & Chen, Gang. Minimum thermal conductivity in superlattices: A first-principles formalism. United States. doi:10.1103/PhysRevB.87.140302.
Garg, Jivtesh, and Chen, Gang. Fri . "Minimum thermal conductivity in superlattices: A first-principles formalism". United States. doi:10.1103/PhysRevB.87.140302. https://www.osti.gov/servlets/purl/1160689.
@article{osti_1160689,
title = {Minimum thermal conductivity in superlattices: A first-principles formalism},
author = {Garg, Jivtesh and Chen, Gang},
abstractNote = {The thermal conductivity of silicon-germanium superlattices is computed here from density-functional perturbation theory using relaxation times that include both anharmonic and interface roughness effects. A decrease in the group velocity of low-frequency phonons in addition to the interface-disorder-induced scattering of high-frequency phonons drives the superlattice thermal conductivity to below the alloy limit. At short periods, interplay between decrease in group velocity and increase in phonon lifetimes with increase in superlattice period leads to a minimum in the cross-plane thermal conductivity. Increasing the mass mismatch between the constituent materials in the superlattice further lowers the thermal conductivity below the alloy limit, pointing to avenues for higher efficiency thermoelectric materials.},
doi = {10.1103/PhysRevB.87.140302},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 14,
volume = 87,
place = {United States},
year = {2013},
month = {4}
}

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Works referenced in this record:

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