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.

*We acknowledge support from NSF grant DMR-1610893, DMR-2004462, ECCS-1607173 and AFOSR Grant FA9550-17-1-0341.

–

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