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Photoluminescence study of carrier localization and recombination in nearly strain-balanced non-polar m-plane InGaN/AlGaN superlattices

ORAL

Abstract

The carrier recombination and localization in near strain-balanced InGaN/AlGaN superlattices grown by plasma-assisted molecular-beam epitaxy was investigated by photoluminescence (PL) spectroscopy. Time-resolved PL shows a recombination lifetime of ~0.3ns, much shorter than that in conventional polar c-plane InGaN/(Al)GaN quantum wells. The temperature dependence of PL energies is not monotonic and experimental PL peak energies are lower than inter-band transition energies calculated using structural parameters obtained from high-resolution x-ray diffraction. This indicates the existence of In composition fluctuation. Sites with high In composition act as localization centers. Time-resolved PL in magnetic field indicates that radiative recombination mainly takes place in localization centers. The localization depth is found to be ~13meV, which is much lower than previously reported for m-plane InGaN/GaN quantum wells. Shallow localization potential contributes to narrower transition peak, but reduces the isolation from non-radiative recombination centers. Rapid drop of PL intensity as temperature increases indicates strong non-radiative recombination at room temperature.

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Presenters

  • Yang Cao

    Purdue University

Authors

  • Yang Cao

    Purdue University

  • Brandon Dzuba

    Purdue University

  • Brenden A Magill

    Virginia Tech, Physics, Virginia Tech

  • Alexander Senichev

    Purdue University

  • Trang Nguyen

    Purdue University

  • Rosa Diaz

    Purdue University

  • Michael Manfra

    Purdue University, Purdue Univ, Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA, Department of Physics and Astronomy and Station Q Purdue, Purdue University, Niels Bohr Institute, Microsoft Station Q, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark, Department of Physics and Astronomy, Purdue University, Birck Nanotechnology Center and Microsoft Quantum Purdue, Purdue University

  • Stephen A McGill

    Condensed Matter Science, National High Magnetic Field Laboratory, National High Magnetic Field Laboratory, Florida State

  • Carlos G Garcia

    Physics, National High Magnetic Field Laboratory and Florida State University, National High Magnetic Field Laboratory, Florida State

  • Giti Khodaparast

    Virginia Tech, Physics, Virginia Tech

  • Oana Malis

    Purdue University