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Theory of phonon conductivity of semiconductor superlattices

Published online by Cambridge University Press:  22 August 2011

Gyaneshwar P. Srivastava  and
Steven P. Hepplestone
Gyaneshwar P. Srivastava
Affiliation:
School of Physics, University of Exeter, Stocker Road, Exeter, EX4 4QL, UK
Steven P. Hepplestone
Affiliation:
Department of Physics, University of Surrey, Guildford GU2 7XH, UK
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Abstract

We present a single-mode relaxation-time theory of phonon conductivity of semisonductor superlattices with nanoscale periodicities. Analytic expressions have been obtained for phonon-interface scattering and phonon-phonon scattering taking into consideration the effects of interfaces and the presence of two materials in superlattices. Numerical calculations have been performed by using phonon eigensolutions obtained from an enhanced adiabatic bond charge model and by carrying out Brillouin zone integration using the special q-points scheme. The experimental measured conductivity results for Si(19)/Ge(5) and Si(72)/Ge(30) superlattices have been successfully explained.

Keywords

thermal conductivityspecific heatsemiconducting
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1347: Symposium BB – Nanoscale Heat Transport—From Fundamentals to Devices , 2011 , mrss11-1347-bb01-10
Copyright
Copyright © Materials Research Society 2011

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References

REFERENCES

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