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Single-crystal growth and thermoelectric properties of Ge(Bi,Sb)4Te7


von Rohr, Fabian; Schilling, Andreas; Cava, Robert J (2013). Single-crystal growth and thermoelectric properties of Ge(Bi,Sb)4Te7. Journal of Physics: Condensed Matter, 25(7):075804.

Abstract

The thermoelectric properties between 10 and 300 K and the growth of single crystals of n-type and p-type GeBi4Te7, GeSb4Te7 and Ge(Bi1−xSbx)4Te7 solid solution are reported. Single crystals were grown by the modified Bridgman method, and p-type behavior was achieved by the substitution of Bi by Sb in GeBi4Te7. The thermopower in the Ge(Bi1−xSbx)4Te7 solid solution ranges from −117 to +160 μV K−1. The crossover from n-type to p-type is continuous with increasing Sb content and is observed at x ≈0.15. The highest thermoelectric efficiencies among the tested n-type and p-type samples are ZnT = 0.11 and ZpT = 0.20, respectively. For an optimal n–p couple in this alloy system the composite figure of merit is ZnpT = 0.17 at room temperature.

Abstract

The thermoelectric properties between 10 and 300 K and the growth of single crystals of n-type and p-type GeBi4Te7, GeSb4Te7 and Ge(Bi1−xSbx)4Te7 solid solution are reported. Single crystals were grown by the modified Bridgman method, and p-type behavior was achieved by the substitution of Bi by Sb in GeBi4Te7. The thermopower in the Ge(Bi1−xSbx)4Te7 solid solution ranges from −117 to +160 μV K−1. The crossover from n-type to p-type is continuous with increasing Sb content and is observed at x ≈0.15. The highest thermoelectric efficiencies among the tested n-type and p-type samples are ZnT = 0.11 and ZpT = 0.20, respectively. For an optimal n–p couple in this alloy system the composite figure of merit is ZnpT = 0.17 at room temperature.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2013
Deposited On:22 Mar 2013 13:15
Last Modified:07 Dec 2017 19:05
Publisher:IOP Publishing
ISSN:0953-8984
Additional Information:This is an author-created, un-copyedited version of an article accepted for publication in Journal of Physics: Condensed Matter. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at dx.doi.org/10.1088/0953-8984/25/7/075804.
Publisher DOI:https://doi.org/10.1088/0953-8984/25/7/075804

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