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Nonlinear thermoelectric efficiency of superlattice-structured nanowires

Karbaschi, Hossein; Lovén, John; Courteaut, Klara; Wacker, Andreas LU and Leijnse, Martin LU (2016) In Physical Review B 94(11).
Abstract

We theoretically investigate nonlinear ballistic thermoelectric transport in a superlattice-structured nanowire. By a special choice of nonuniform widths of the superlattice barriers - analogous to antireflection coating in optical systems - it is possible to achieve a transmission which comes close to a square profile as a function of energy. We calculate the low-temperature output power and power-conversion efficiency of a thermoelectric generator based on such a structure and show that the efficiency remains high also when operating at a significant power. To provide guidelines for experiments, we study how the results depend on the nanowire radius, the number of barriers, and on random imperfections in barrier width and separation.... (More)

We theoretically investigate nonlinear ballistic thermoelectric transport in a superlattice-structured nanowire. By a special choice of nonuniform widths of the superlattice barriers - analogous to antireflection coating in optical systems - it is possible to achieve a transmission which comes close to a square profile as a function of energy. We calculate the low-temperature output power and power-conversion efficiency of a thermoelectric generator based on such a structure and show that the efficiency remains high also when operating at a significant power. To provide guidelines for experiments, we study how the results depend on the nanowire radius, the number of barriers, and on random imperfections in barrier width and separation. Our results indicate that high efficiencies can indeed be achieved with today's capabilities in epitaxial nanowire growth.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
94
issue
11
publisher
American Physical Society
external identifiers
  • scopus:84990966865
  • wos:000383234300008
ISSN
1098-0121
DOI
10.1103/PhysRevB.94.115414
language
English
LU publication?
yes
id
8b9b30dc-caf9-4a37-97c0-419d7b427379
date added to LUP
2017-01-10 11:29:03
date last changed
2017-09-18 11:35:38
@article{8b9b30dc-caf9-4a37-97c0-419d7b427379,
  abstract     = {<p>We theoretically investigate nonlinear ballistic thermoelectric transport in a superlattice-structured nanowire. By a special choice of nonuniform widths of the superlattice barriers - analogous to antireflection coating in optical systems - it is possible to achieve a transmission which comes close to a square profile as a function of energy. We calculate the low-temperature output power and power-conversion efficiency of a thermoelectric generator based on such a structure and show that the efficiency remains high also when operating at a significant power. To provide guidelines for experiments, we study how the results depend on the nanowire radius, the number of barriers, and on random imperfections in barrier width and separation. Our results indicate that high efficiencies can indeed be achieved with today's capabilities in epitaxial nanowire growth.</p>},
  articleno    = {115414},
  author       = {Karbaschi, Hossein and Lovén, John and Courteaut, Klara and Wacker, Andreas and Leijnse, Martin},
  issn         = {1098-0121},
  language     = {eng},
  month        = {09},
  number       = {11},
  publisher    = {American Physical Society},
  series       = {Physical Review B},
  title        = {Nonlinear thermoelectric efficiency of superlattice-structured nanowires},
  url          = {http://dx.doi.org/10.1103/PhysRevB.94.115414},
  volume       = {94},
  year         = {2016},
}