Impact of alloy fluctuations and Coulomb effects on the electronic and optical properties of c-plane GaN/AlGaN quantum wells

Roble, A. A. and Patra, S. K. and Massabuau, F. and Frentrup, M. and Leontiadou, M. A. and Dawson, P. and Kappers, M. J. and Oliver, R. A. and Graham, D. M. and Schulz, S. (2019) Impact of alloy fluctuations and Coulomb effects on the electronic and optical properties of c-plane GaN/AlGaN quantum wells. Scientific Reports. ISSN 2045-2322 (In Press)

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Abstract

We report on a combined theoretical and experimental study of the impact of alloy fluctuations and Coulomb effects on the electronic and optical properties ofc-plane GaN/AlGaN multi-quantum well systems. The presence of carrier localization effects in this system was demonstrated by experimental observations, such as the "S-shape" temperature dependence of the photoluminescence (PL) peak energy, and non-exponential PL decay curves that varied across the PL spectra at 10 K. A three-dimensional modified continuum model, coupled with a self-consistent Hartree scheme, was employed to gain insight into the electronic and optical properties of the experimentally studied c-plane GaN/AlGaN quantum wells. This model confirmedthe existence of strong hole localization arising from the combined effects of the built-in polarization field along the growth direction and the alloy fluctuations at the quantum well/barrier interface. However, for electrons these localization effects are less pronounced in comparison to the holes. Furthermore, our calculations show that the attractive Coulomb interaction between electron and hole results in exciton localization. This behavior is in contrast to the picture of independently localized electrons and holes, often used to explain the radiative recombination process in c-plane InGaN/GaN quantum well systems

ORCID iDs

Roble, A. A., Patra, S. K., Massabuau, F. ORCID logoORCID: https://orcid.org/0000-0003-1008-1652, Frentrup, M., Leontiadou, M. A., Dawson, P., Kappers, M. J., Oliver, R. A., Graham, D. M. and Schulz, S.;
  • Item type:Article
    ID code:70116
    Dates:
    Date
    Event
    1 October 2019
    Published
    1 October 2019
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:15 Oct 2019 10:55
    Last modified:11 Nov 2024 12:27
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/70116
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