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Lateral Composition Modulation in Mixed Anion Short Period Superlattices

  • C. Dorin (a1), C. Wauchope (a2) and J. Mirecki Millunchick (a1)

Abstract

In this work, we demonstrate for the first time lateral composition modulation in GaAs/GaSb short period superlattices (SPS). Several different structures were investigated in order to study the role of Group V overpressure on the final composition and uniformity of the structure. Cross sectional transmission electron diffraction and xray diffraction reciprocal space maps reveal that the film is indeed phase separated. The composition modulation observed in these films is a result of the SPS growth and not due to spinodal decomposition, as evidenced by the fact that an alloy grown at the same conditions results in a homogeneous layer.

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[1]Millunchick, J. Mirecki., Twesten, R. D., Follstaedt, D. M., Lee, S. R., Jones, E.D., Ahrenkiel, S. P., Zhang, Y., Mascarenhas, A., Applied Physics Letters, 70, 1402 (1997)
[2] Cheng, K. Y., Hsieh, K. C., Baillargeon, J. N., Appl. Phys. Lett, 60 (23), 2892, 1992,
[3] Norman, A., , G, Ahrenkiel, S. P., Moutinho, H., Al-Jassim, M. M., Mascarenhas, A., Millunchick, J. Mirecki, Lee, S. R., Twesten, R. D., Follstaedt, D. M., Reno, J. L, Jones, E.D., Applied Physics Letters, 73, 1844 (1998)
[4] Blank, H.R, Mathis, S., Hall, E., Bhargava, S., Behres, A., Heuken, M., Kroemer, H., Narayanamurti, V., Journal of Crystal Growth, 187,18 (1998)]

Lateral Composition Modulation in Mixed Anion Short Period Superlattices

  • C. Dorin (a1), C. Wauchope (a2) and J. Mirecki Millunchick (a1)

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