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Artificially Atomic-scale Ordered Superlattice Alloys for Thermoelectric Applications

Published online by Cambridge University Press:  01 February 2011

S. Cho ,
Y. Kim ,
A. DiVenere ,
G. K. L. Wong ,
A. J. Freeman ,
J. B. Ketterson ,
L. J. Olafsen ,
I. Vurgaftman ,
J. R. Meyer  and
C. A. Hoffman
...Show all authors
S. Cho
Affiliation:
Dept. of Physics & Astronomy, Northwestern University, Evanston, IL 60208
Y. Kim
Affiliation:
Dept. of Physics & Astronomy, Northwestern University, Evanston, IL 60208
A. DiVenere
Affiliation:
Dept. of Physics & Astronomy, Northwestern University, Evanston, IL 60208
G. K. L. Wong
Affiliation:
Dept. of Physics & Astronomy, Northwestern University, Evanston, IL 60208
A. J. Freeman
Affiliation:
Dept. of Physics & Astronomy, Northwestern University, Evanston, IL 60208
J. B. Ketterson
Affiliation:
Dept. of Physics & Astronomy, Northwestern University, Evanston, IL 60208
L. J. Olafsen
Affiliation:
Naval Research Laboratory, Washington, D.C. 20375–5338
I. Vurgaftman
Affiliation:
Naval Research Laboratory, Washington, D.C. 20375–5338
J. R. Meyer
Affiliation:
Naval Research Laboratory, Washington, D.C. 20375–5338
C. A. Hoffman
Affiliation:
Naval Research Laboratory, Washington, D.C. 20375–5338
G. Chen
Affiliation:
Mechanical & Aerospace Engineering Dept., Univ. of California, Los Angeles, CA 90095.
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Abstract

We report artificially atomic-scale ordered superlattice alloy systems, new scheme to pursue high-ZT materials. We have fabricated Bi/Sb superlattice alloys that are artificially ordered on the atomic scale using MBE, confirmed by the presence of XRD superlattice satellites. We have observed that the electronic structure can be modified from semimetal, through zero-gap, to semiconductor by changing the superlattice period and sublayer thicknesses using electrical resistivity, thermopower, and magneto-transport measurements. InSb/Bi superlattice alloys have also been prepared and studied using XRD and thermopower measurements, which shows that their thermoelectric transport properties can be modified in accordance with structural modification. This superlattice alloy scheme gives us one more tool to control and tune the electronic structure and consequently the thermoelectric properties.

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 , Z2.4
Copyright
Copyright © Materials Research Society 2000

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References

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