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Use of field-effect density modulation to increase ZT for Si nanowires : a simulation study
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Neophytou, Neophytos, Karamitaheri, Hossein and Kosina, Hans (2015) Use of field-effect density modulation to increase ZT for Si nanowires : a simulation study. Journal of Electronic Materials, 44 (6). pp. 1599-1605. doi:10.1007/s11664-014-3488-4 ISSN 0361-5235.
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Official URL: http://dx.doi.org/10.1007/s11664-014-3488-4
Abstract
Modulation doping is a promising means of increasing the electrical conductivity of thermoelectric (TE) materials and achieving a high figure of merit (ZT). We compared, qualitatively and quantitatively, the TE performance of a field-effect density modulated Si nanowire channel of diameter D = 12 nm with that of its doped counterpart, by use of self-consistent atomistic tight-binding simulations coupled to the Boltzmann transport equation. We describe the simulation model, and show that as a result of a large improvement in electrical conductivity, gating, rather than doping, can result in greater than three-fold improvement of the TE power factor. Despite the large increase in the electronic part of the thermal conductivity, the total thermal conductivity is still dominated by phonons. Thus, a ZT more than three-fold higher can also be achieved in the gated channel compared with the doped channel. Finally, we show that the power factor peak is obtained when the Fermi level resides ∼k B T below the band edge, as is observed for doped channels.
Item Type: | Journal Article | ||||||||||
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Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||||
Library of Congress Subject Headings (LCSH): | Silicon -- Electric properties, Nanowires, Transport theory, Thermoelectricity | ||||||||||
Journal or Publication Title: | Journal of Electronic Materials | ||||||||||
Publisher: | Springer New York LLC | ||||||||||
ISSN: | 0361-5235 | ||||||||||
Official Date: | June 2015 | ||||||||||
Dates: |
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Volume: | 44 | ||||||||||
Number: | 6 | ||||||||||
Page Range: | pp. 1599-1605 | ||||||||||
DOI: | 10.1007/s11664-014-3488-4 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||
Date of first compliant deposit: | 2 March 2016 | ||||||||||
Date of first compliant Open Access: | 3 March 2016 | ||||||||||
Funder: | Seventh Framework Programme (European Commission) (FP7), Fonds zur Förderung der Wissenschaftlichen Forschung (Austria) (FWF) | ||||||||||
Grant number: | 263306 (FP7), P25368 (FWF) |
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