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Lattice Dynamics Study of Anisotropic Heat Conduction in Superlattices

Published online by Cambridge University Press:  01 February 2011

B. Yang  and
G. Chen
B. Yang
Affiliation:
Mechanical and Aerospace Engineering Department, University of California at Los Angeles, Los Angeles, CA 90095–1597
G. Chen
Affiliation:
Mechanical and Aerospace Engineering Department, University of California at Los Angeles, Los Angeles, CA 90095–1597
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Abstract

Past studies on the thermal conductivity suggest that phonon confinement and the associated group velocity reduction are the causes of the observed drop in the cross-plane thermal conductivity of semiconductor superlattices. In this work, we investigate the contribution of phonon confinement to the in-plane thermal conductivity of superlattices and the anisotropic effects of phonon confinement on the thermal conductivity in different directions, using a lattice dynamics model. We find that the reduced phonon group velocity due to phonon confinement may account for the dramatic reduction in the cross-plane thermal conductivity, but the in-plane thermal conductivity drop, caused by the reduced group velocity, is much less than the reported experimental results. This suggests that the reduced relaxation time due to diffuse interface phonon scattering, dislocation scattering, etc, should make major contribution to the in-plane thermal conductivity reduction.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 626: Symposium Z – Thermoelectric Materials 2000 - The Next Generation Materials for Small-Scale Refrigeration and Power Generation Applications , 2000 , Z8.3
Copyright
Copyright © Materials Research Society 2000

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