ZnGeSb2: a promising thermoelectric material with tunable ultra-high conductivity

Sreeparvathy, P C and V, Kanchana and Vaitheeswaran, G and Christensen, N E (2016) ZnGeSb2: a promising thermoelectric material with tunable ultra-high conductivity. Physical Chemistry Chemical Physics, 18 (37). pp. 26275-26283. ISSN 1463-9076

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First principles calculations predict the promising thermoelectric material ZnGeSb2 with a huge power factor (S2σ/τ) on the order of 3 × 1017 W m−1 K−2 s−1, due to the ultra-high electrical conductivity scaled by a relaxation time of around 8.5 × 1025 Ω−1 m−1 s−1, observed in its massive Dirac state. The observed electrical conductivity is higher than the well-established Dirac materials, and is almost carrier concentration independent with similar behaviour of both n and p type carriers, which may certainly attract device applications. The low range of thermal conductivity is also evident from the phonon dispersion. Our present study further reports the gradual phase change of ZnGeSb2 from a normal semiconducting state, through massive Dirac states, to a topological semi-metal. The maximum power factor is observed in the massive Dirac states compared to the other two states.

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IITH Creators:
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Item Type: Article
Subjects: Physics
Divisions: Department of Physics
Depositing User: Team Library
Date Deposited: 14 Sep 2016 06:45
Last Modified: 16 Aug 2017 10:49
URI: http://raiith.iith.ac.in/id/eprint/2752
Publisher URL: https://doi.org/10.1039/C6CP05446C
OA policy: http://www.sherpa.ac.uk/romeo/issn/1463-9076/
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