The Effect of Nanostructure on Near-Infrared Absorption in M-Plane AlGaN/(In)GaN Heterostructures

ORAL

Abstract

Near infrared intersubband (ISB) absorption of nonpolar AlxGa1-xN/(In)GaN is studied due to its broad potential applications into optoelectronic devices. Above 60% Al-composition, m-plane AlGaN alloy becomes kinetically unstable during the plasma-assisted molecular beam epitaxy growth generating unique nanostructures. The nanostructures are imaged with energy dispersive x-ray spectroscopy and scanning transmission electron microscopy. They consist of platforms of higher than expected Al-composition and islands of lower Al-composition AlGaN. We discuss the consequences of these nanostructures on ISB absorption energy and linewidth. We are also investigating strain-balanced AlxGa1-xN/InGaN (x<0.6) as an alternative to AlxGa1-xN/GaN (x>0.6).

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Presenters

  • Trang Nguyen

    Purdue University, Physics and Astronomy, Purdue University

Authors

  • Trang Nguyen

    Purdue University, Physics and Astronomy, Purdue University

  • MohammadAli Shirazi-Hosseini-Dokht

    Purdue University, Physics and Astronomy, Purdue University

  • Yang Cao

    Purdue University, Physics and Astronomy, Purdue University

  • Alexander Senichev

    Purdue University, Birck Nano Technology Center, Purdue University

  • Brandon Dzuba

    Purdue University, Physics and Astronomy, Purdue University

  • Rosa Diaz

    Purdue University, Birck Nano Technology Center, Purdue University, Birck Nanotechnology Center, Purdue University

  • Geoffrey Gardner

    Department of Physics and Astronomy, Purdue University, Purdue University, Birck Nano Technology Center, Purdue University, Dept. of Physics, Purdue University, Department of Physics and Astronomy and Station Q Purdue, Purdue University, Department of Physics and Astronomy, Station Q Purdue, and Birck Nanotechnology Center, Purdue University

  • Oana Malis

    Purdue University, Physics and Astronomy, Purdue University

  • Michael Manfra

    Purdue University, Microsoft, Department of Physics and Astronomy and Station Q Purdue, Purdue University, Department of Physics and Astronomy, Purdue University, Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907 USA, Microsoft Station Q Purdue, Physics and Astronomy, Purdue University, Department of Physics and Astronomy, School of Materials Engineering and School of Electrical and Computer Engineering, Purdue University, Station Q Purdue and Department of Physics and Astronomy, Purdue University, Dept. of Physics, Purdue University, Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA, Dept. of Physics and Astronomy, Purdue, Purdue University, Station Q Purdue, Department of Physics and Astronomy, Station Q Purdue, and Birck Nanotechnology Center, Purdue University