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Ultra-high thermoelectric power factors in narrow gap materials with asymmetric bands
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Graziosi, Patrizio and Neophytou, Neophytos (2020) Ultra-high thermoelectric power factors in narrow gap materials with asymmetric bands. The Journal of Physical Chemistry C, 124 (34). pp. 18462-18473. doi:10.1021/acs.jpcc.0c05457
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Official URL: http://dx.doi.org/10.1021/acs.jpcc.0c05457
Abstract
We theoretically unveil the unconventional possibility of achieving extremely high thermoelectric power factors in lightly doped narrow gap semiconductors with asymmetric conduction/valence bands operated in the bipolar transport regime. Specifically, using Boltzmann transport simulations, we show that narrow band gap materials, rather than suffering from performance degradation due to bipolar conduction, if they possess highly asymmetric conduction and valence bands in terms of either effective masses, density of states, or phonon scattering rates, then they can deliver very high power factors. We show that this is achieved because, under these conditions, electronic transport becomes phonon scattering-limited, rather than ionized impurity scattering-limited, which allows large conductivities. We explain why this effect has not been observed so far in the known narrow-gap semiconductors, interpret some recent related experimental findings, and propose a few examples from the half-Heusler materials family, for which this effect can be observed and power factors even up to 50 mW/mK2 can be reached.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QC Physics | |||||||||
| Divisions: | Faculty of Science > Engineering | |||||||||
| Library of Congress Subject Headings (LCSH): | Thermoelectricity , Low-dimensional semiconductors , Transport theory, Phonons -- Scattering | |||||||||
| Journal or Publication Title: | The Journal of Physical Chemistry C | |||||||||
| Publisher: | American Chemical Society | |||||||||
| ISSN: | 1932-7447 | |||||||||
| Official Date: | 27 August 2020 | |||||||||
| Dates: |
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| Volume: | 124 | |||||||||
| Number: | 34 | |||||||||
| Page Range: | pp. 18462-18473 | |||||||||
| DOI: | 10.1021/acs.jpcc.0c05457 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Publisher Statement: | This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.jpcc.0c05457 | |||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||
| RIOXX Funder/Project Grant: |
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