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P-type SiGe/Si Superlattice Cooler

Published online by Cambridge University Press:  01 February 2011

Xiaofeng Fan ,
Gehong Zeng ,
Edward Croke ,
Gerry Robinson ,
Chris LaBounty ,
Channing C. Ahn ,
Ali Shakouri  and
John E. Bowers
Xiaofeng Fan
Affiliation:
Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, U.S.A.
Gehong Zeng
Affiliation:
Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, U.S.A.
Edward Croke
Affiliation:
California Institute of Technology, Pasadena, CA 91125, U.S.A.
Gerry Robinson
Affiliation:
Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, U.S.A.
Chris LaBounty
Affiliation:
Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, U.S.A.
Channing C. Ahn
Affiliation:
California Institute of Technology, Pasadena, CA 91125, U.S.A.
Ali Shakouri
Affiliation:
Baskin School of Engineering, University of California, Santa Cruz, CA 95064, U.S.A.
John E. Bowers
Affiliation:
Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, U.S.A.
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Abstract

The fabrication and characterization of single element p-type SiGe/Si superlattice coolers are described. Superlattice structures were used to enhance the device performance by reducing the thermal conductivity between the hot and the cold junctions, and by providing selective emission of hot carriers through thermionic emission. The structure of the samples consisted of a 3 μm thick symmetrically strained Si0.7Ge0.3/Si superlattice grown on a buffer layer designed so that the in-plane lattice constant is approximately that of relaxed Si0.9Ge0.1. Cooling up to 2.7 K at 25 °C and 7.2 K at 150 °C were measured. These p-type coolers can be combined with n-type devices that were demonstrated in our previous work. This is similar to conventional multi element thermoelectric devices, and it will enable us to achieve large cooling capacities with relatively small currents.

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 , Z11.5
Copyright
Copyright © Materials Research Society 2000

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References

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