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Electron Transport in InAs/AlSb Quantum Wells: Interface Sequencing Effects

Published online by Cambridge University Press:  28 February 2011

Gary Tuttle,
Herbert Kroemer and
John H. English
Gary Tuttle
Affiliation:
Department of Electrical and Computer Engineering University of California, Santa Barbara, California 93106
Herbert Kroemer
Affiliation:
Department of Electrical and Computer Engineering University of California, Santa Barbara, California 93106
John H. English
Affiliation:
Department of Electrical and Computer Engineering University of California, Santa Barbara, California 93106
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Abstract

We present data on electron transport in AlSb/InAs/AlSb quantum wells grown by molecular beam epitaxy. Because both anion and cation change across an InAs/Alsb interface, it is possible to grow such wells with two different types of interfaces, one with an InSb-like bond configuration, the other AlAs-like. Electron mobility and concentration were found to depend very strongly on the manner in which the quantum well's interfaces were grown, with high mobilities seen only if the bottom interface is InSb-like. An As-on-Al sites antisite defect model is postulated for bottom AlAs-like interfaces.

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