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Dependence of Optical Properties of Semiconductor Alloys on Long Range Order, Strain and Pressure

Published online by Cambridge University Press:  10 February 2011

Su-Huai Wei ,
Alberto Franceschetti  and
Alex Zunger
Su-Huai Wei
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401
Alberto Franceschetti
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401
Alex Zunger
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401
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Abstract

Many III – V semiconductor alloys exhibit spontaneous (111) alternate monolayer ordering when grown from the vapor phase. We have studied theoretically the ordering induced changes in the optical properties of the semiconductor alloys. We describe (i) the change of the band gap ΔE9, and the valence band splitting ΔE12 as functions of the long range order parameter η, (ii) the consequence of coexistence of (001) epitaxial strain and (111) chemical ordering on the optical properties, (iii) optical anisotropy and spin polarization effects in the ordered alloy, (iv) theory of reflectance-difference spectroscopy in ordered alloy, and (v) the ordering-induced changes on high energy E1 and E2 transitions. Specific, experimentally testable predictions are listed in the summary section.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 417: Symposium EE – Optoelectronic Materials-Ordering, Composition Modulation, and Self-Assembled … , 1995 , 3
Copyright
Copyright © Materials Research Society 1996

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