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  1. No Access

    Article

    A Novel Surface Preparation and Post-Etch Removal Technique for InGaAs Sidewalls

    This paper describes in detail a surface preparation, and post-etch removal technique developed for InGaAs sidewalls. It illustrates the results demonstrating the effect of sidewall post-etch, surface preparat...

    S. A. Tabatabaei, G. A. Porkolab, S. Agarwala… in MRS Online Proceedings Library (1997)

  2. No Access

    Article

    Optical Characterization of AlInP/GaAs Heterostructures

    A 45 period GaAs/Al0.54In0.46P superlattice was grown by molecular beam epitaxy using valved solid-sources to supply both the arsenic (As4) and the phosphorus (P2) group V fluxes. The room temperature optical tra...

    F.G. Johnson, G.E. Kohnke, G.W. Wicks in MRS Online Proceedings Library (1993)

  3. No Access

    Article

    Tilted superlattice composition profile determined by photoluminescence and thermal disordering

    The composition profile of an (AlAs)1/2(GaAs)1/2 tilted superlattice is characterized for the first time. The tilted superlattice sample is thermally disordered, and the energy of the direct band gap photolumines...

    F. G. Johnson, B. L. Olmsted, Samuel Chen, G. W. Wicks in Journal of Electronic Materials (1993)

  4. No Access

    Article

    Use of Valved, Solid Group V Sources for the Growth of GaAs/GaInP Heterostructures by Molecular Beam Epitaxy

    We report on the first growth of GaAs/Ga0.5In0.5P heterostructures by conventional molecular beam epitaxy using solid-source valved crackers to supply both the arsenic and the phosphorus fluxes. By regulating the...

    F. G. Johnson, G. W. Wicks, R. E. Viturro, R. Laforce in MRS Online Proceedings Library (1992)

  5. No Access

    Article

    GaInP and AlInP grown by elemental source molecular beam epitaxy

    We report on the use of a new, valved, solid phosphorus cracker source for the growth of phosphides by molecular beam epitaxy. The source avoids the relatively high expense and high level of toxicity associate...

    J. A. Varriano, M. W. Koch, F. G. Johnson, G. W. Wicks in Journal of Electronic Materials (1992)

  6. No Access

    Article

    The sediment column as a record of trophic status: examples from Bosherston Lakes, SW Wales

    Bosherston Lakes are a series of interconnected, mesotrophic to hypereutrophic, artificially-created coastal marl lakes in Dyfed, South West Wales. Progressive eutrophication of the lake system has been produc...

    A. W. G. Rees, G. C. F. Hinton, F. G. Johnson, P. E. O'Sullivan in Hydrobiologia (1991)

  7. No Access

    Chapter and Conference Paper

    The sediment column as a record of trophic status: examples from Bosherston Lakes, SW Wales

    Bosherston Lakes are a series of interconnected, mesotrophic to hypereutrophic, artificially-created coastal marl lakes in Dyfed, South West Wales. Progressive eutrophication of the lake system has been produc...

    A. W. G. Rees, G. C. F. Hinton, F. G. Johnson… in Environmental History and Palaeolimnology (1991)