A. Bentien et al 2007 EPL 80 17008 doi:10.1209/0295-5075/80/17008
Colossal Seebeck coefficient in strongly correlated semiconductor FeSb2
A. Bentien1, S. Johnsen2, G. K. H. Madsen2, B. B. Iversen2 and F. Steglich1
Show affiliationsFor more than a decade strongly correlated semiconductors and Kondo insulators have been considered as potential thermoelectric materials. Such materials have large d- or f-character of the electronic band structure close to the Fermi level that theoretically leads to Seebeck coefficients (S) with large magnitudes. In this work it is shown for the first time that the strongly correlated semiconductor FeSb2 exhibits a colossal Seebeck coefficient of ~−45000 μVK−1 at 10 K. The thermoelectric power factor PF=S2
ρ−1, where ρ is the electrical resistivity, reaches a record high value of ~2300 μWK−2 cm−1 at 12 K and is 65 times larger than that of the state-of-the-art Bi2Te3-based thermoelectric materials. However, due to a large lattice thermal conductivity the dimensionless thermoelectric figure of merit is only 0.005 at 12 K. Nonetheless, the potential of FeSb2 as a future solid-state thermoelectric cooling device at cryogenic temperatures is underlined.
- PACS
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72.20.-i Conductivity phenomena in semiconductors and insulators
- Subjects
- Dates
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Issue 1 (October 2007)
Received 15 August 2007, accepted for publication 16 August 2007
Published 17 September 2007
An Erratum for this article has been published in 2007 EPL 80 39901
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Colossal Seebeck coefficient in strongly correlated semiconductor FeSb2
A. Bentien et al 2007 EPL 80 17008
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