Demonstration of electron filtering to increase the Seebeck coefficient in ${\mathrm{In}}_{0.53}{\mathrm{Ga}}_{0.47}\mathrm{As}∕{\mathrm{In}}_{0.53}{\mathrm{Ga}}_{0.28}{\mathrm{Al}}_{0.19}\mathrm{As}$ superlattices

Demonstration of electron filtering to increase the Seebeck coefficient in ${In}_{0.53} {Ga}_{0.47} As ∕ {In}_{0.53} {Ga}_{0.28} {Al}_{0.19} As$ superlattices

J. M. O. Zide, D. Vashaee, Z. X. Bian, G. Zeng, J. E. Bowers, A. Shakouri, and A. C. Gossard

Phys. Rev. B 74, 205335 – Published 30 November 2006

Abstract

In this paper, we explore electron filtering as a technique to increase the Seebeck coefficient and the thermoelectric power factor of heterostructured materials over that of the bulk. We present a theoretical model in which the Seebeck coefficient and the power factor can be increased in an ${In}_{0.53} {Ga}_{0.47} As$ -based composite material. Experimental measurements of the cross-plane Seebeck coefficient are presented and confirm the importance of the electron filtering technique to decouple the electrical conductivity and Seebeck coefficient to increase the thermoelectric power factor.

Received 17 April 2006

DOI:https://doi.org/10.1103/PhysRevB.74.205335

Authors & Affiliations

J. M. O. Zide¹, D. Vashaee², Z. X. Bian², G. Zeng³, J. E. Bowers³, A. Shakouri², and A. C. Gossard¹

¹Materials Department, University of California, Santa Barbara, California 93106-5050, USA
²Jack Baskin School of Engineering, University of California, Santa Cruz, California 95064, USA
³Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106, USA

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Vol. 74, Iss. 20 — 15 November 2006

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Physical Review B

covering condensed matter and materials physics

Demonstration of electron filtering to increase the Seebeck coefficient in ${In}_{0.53} {Ga}_{0.47} As ∕ {In}_{0.53} {Ga}_{0.28} {Al}_{0.19} As$ superlattices

J. M. O. Zide, D. Vashaee, Z. X. Bian, G. Zeng, J. E. Bowers, A. Shakouri, and A. C. Gossard

Phys. Rev. B 74, 205335 – Published 30 November 2006

Abstract

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Physical Review B

covering condensed matter and materials physics

Demonstration of electron filtering to increase the Seebeck coefficient in In0.53Ga0.47As∕In0.53Ga0.28Al0.19As superlattices

J. M. O. Zide, D. Vashaee, Z. X. Bian, G. Zeng, J. E. Bowers, A. Shakouri, and A. C. Gossard

Phys. Rev. B 74, 205335 – Published 30 November 2006

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Demonstration of electron filtering to increase the Seebeck coefficient in ${In}_{0.53} {Ga}_{0.47} As ∕ {In}_{0.53} {Ga}_{0.28} {Al}_{0.19} As$ superlattices