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A Detailed Theoretical Study of the Thermal Conductivity of Bi2(Te0.85Se0.15)3 Single Crystals

Published online by Cambridge University Press:  21 February 2012

Ö. Ceyda Yelgel  and
Gyaneshwar P. Srivastava
Ö. Ceyda Yelgel
Affiliation:
School of Physics, University of Exeter, Stocker Road, Exeter, EX4 4QL, UK
Gyaneshwar P. Srivastava
Affiliation:
School of Physics, University of Exeter, Stocker Road, Exeter, EX4 4QL, UK
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Abstract

We present a theoretical investigation of the thermal conductivity for n-type doped Bi2(Te0.85Se0.15)3 single crystals by using the Debye model within the single-mode relaxationtime approximation. A detailed account of alloy, electron-phonon, phonon-phonon and electron-hole pair (bipolar) interactions are included. Different levels (0.1 and 0.05 wt.%) of n-doping from CuBr and SbI3 dopants were considered. The calculated conductivity, by combining lattice (κ ph) and electronic bipolar (κ bp) contributions, successfully explains the experimental results obtained by Hyun et al. [J. Mat. Sci. 33 5595 (1998)]. The κ ph contribution was calculated using Srivastava’s scheme and the κ bp contribution was obtained by employing Price’s theory.

Keywords

thermal conductivitythermoelectricalloy
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1404: Symposium W – Phonons in Nanomaterials–Theory, Experiments and Applications , 2012 , mrsf11-1404-w03-02
Copyright
Copyright © Materials Research Society 2012

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References

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