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Thickness Dependences of the Thermoelectric Properties in (001)KCl/PbTe/SnTe/PbTe Heterostructures

Published online by Cambridge University Press:  01 February 2011

Elena I. Rogacheva
Affiliation:
National Technical University “Kharkov Polytechnic Institute”, 21 Frunze St., Kharkov 61002, UKRAINE
Olga N. Nashchekina
Affiliation:
National Technical University “Kharkov Polytechnic Institute”, 21 Frunze St., Kharkov 61002, UKRAINE
Svetlana G. Lyubchenko
Affiliation:
National Technical University “Kharkov Polytechnic Institute”, 21 Frunze St., Kharkov 61002, UKRAINE
Yegor O. Vekhov
Affiliation:
National Technical University “Kharkov Polytechnic Institute”, 21 Frunze St., Kharkov 61002, UKRAINE
Mildred S. Dresselhaus
Affiliation:
Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, U.S.A.
Gene Dresselhaus
Affiliation:
National Technical University “Kharkov Polytechnic Institute”, 21 Frunze St., Kharkov 61002, UKRAINE
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Abstract

The dependences of the thermoelectric properties of (001)KCl/PbTe/SnTe/PbTe three-layer structures on the SnTe layer thickness (dSnTe = 0.5–6.0 nm) at a fixed thickness of PbTe layers were studied. It was established that the thickness dependences of the Seebeck coefficient, the Hall coefficient, electrical conductivity, charge carrier mobility, and the thermoelectric power factor are distinctly non-monotonic. Two possible reasons for this non-monotonic behavior of the thickness dependences of the thermoelectric properties are considered: the size quantization of the energy spectrum in a SnTe quantum well and / or the formation of edge misfit dislocations at the interfaces after reaching the critical thickness, which corresponds to the transition from a pseudomorphic growth to the introduction of misfit dislocations at the interfaces. It is suggested that the observed effect has a general character and should be taken into account when optimizing thermoelectric properties of superlattices.

Type
Research Article
Copyright
Copyright © Materials Research Society 2004

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References

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Thickness Dependences of the Thermoelectric Properties in (001)KCl/PbTe/SnTe/PbTe Heterostructures
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