Alloy Disorder Effects In Molecular Beam Epitaxically Grown AlxGa1_xAs Examined Via Raman And Rayleigh Scattering And Near Edge Luminescence

Pudong Lao; Wade C. Tang; A. Madhukar; P. Chen

doi:10.1117/12.947424

9 August 1988 Alloy Disorder Effects In Molecular Beam Epitaxically Grown Al_xGa_1-xAs Examined Via Raman And Rayleigh Scattering And Near Edge Luminescence

Pudong Lao, Wade C. Tang, A. Madhukar, P. Chen

Author Affiliations +

Proceedings Volume 0946, Spectroscopic Characterization Techniques for Semiconductor Technology III; (1988) https://doi.org/10.1117/12.947424
Event: Advances in Semiconductors and Superconductors: Physics and Device Applications, 1988, Newport Beach, CA, United States

Abstract

Raman scattering, Rayleigh scattering and band edge photoluminescence are employed to examine the behavior of alloy disorder in AlxGa1-xAs alloys grown on GaAs(100) under reflection high energy electron diffraction determined growth conditions in molecular beam epitaxy. Evidence is found for the dependence of the short and long range disorder effects on the growth kinetics attendant to chosen growth conditions and on the Al concentration. At high Al concentration (xAl~0.8) evidence is found for the occurrence of atomic scale GaAs-like and AlAs-like regions. In addition, the "AlAs-like" TO mode is observed in the forbidden back scattering geometry and is likely due to strain and/or disorder related breakdown of the usual selection rules.

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Pudong Lao, Wade C. Tang, A. Madhukar, and P. Chen "Alloy Disorder Effects In Molecular Beam Epitaxically Grown Al_xGa_1-xAs Examined Via Raman And Rayleigh Scattering And Near Edge Luminescence", Proc. SPIE 0946, Spectroscopic Characterization Techniques for Semiconductor Technology III, (9 August 1988); https://doi.org/10.1117/12.947424

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