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  Large Seebeck effect by charge-mobility engineering

Sun, P., Wei, B., Zhang, J., Tomczak, J. M., Strydom, A. M., Sondergaard, M., et al. (2015). Large Seebeck effect by charge-mobility engineering. Nature Communications, 6: 7475, pp. 1-5. doi:10.1038/ncomms8475.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-B17B-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-1CDA-B
Genre: Journal Article

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Sun, Peijie1, Author
Wei, Beipei1, Author
Zhang, Jiahao1, Author
Tomczak, Jan M.1, Author
Strydom, A. M.2, Author              
Sondergaard, M.1, Author
Iversen, Bo B.1, Author
Steglich, Frank3, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

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 Abstract: The Seebeck effect describes the generation of an electric potential in a conducting solid exposed to a temperature gradient. In most cases, it is dominated by an energy-dependent electronic density of states at the Fermi level, in line with the prevalent efforts towards superior thermoelectrics through the engineering of electronic structure. Here we demonstrate an alternative source for the Seebeck effect based on charge-carrier relaxation: a charge mobility that changes rapidly with temperature can result in a sizeable addition to the Seebeck coefficient. This new Seebeck source is demonstrated explicitly for Ni-doped CoSb3, where a marked mobility change occurs due to the crossover between two different charge-relaxation regimes. Our findings unveil the origin of pronounced features in the Seebeck coefficient of many other elusive materials characterized by a significant mobility mismatch. When utilized appropriately, this effect can also provide a novel route to the design of improved thermoelectric materials.

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 Dates: 2015-06-252015-06-25
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1038/ncomms8475
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 6 Sequence Number: 7475 Start / End Page: 1 - 5 Identifier: ISSN: 2041-1723
CoNE: /journals/resource/2041-1723