Bimodality in Arrays of In0.4Ga0.6As Hybrid Quantum-Confined Heterostructures Grown on GaAs Substrates
- Authors: Nadtochiy A.M.1,2,3, Mintairov S.A.3, Kalyuzhnyy N.A.3, Rouvimov S.S.4, Nevedomskii V.N.3, Maximov M.V.1,2,3, Zhukov A.E.1,2
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Affiliations:
- St. Petersburg Academic University—Nanotechnology Research and Education Centre
- Solar Dots, Ltd.
- Ioffe Institute
- University of Notre Dame, Notre Dame
- Issue: Vol 52, No 1 (2018)
- Pages: 53-58
- Section: Semiconductor Structures, Low-Dimensional Systems, and Quantum Phenomena
- URL: https://journals.rcsi.science/1063-7826/article/view/202235
- DOI: https://doi.org/10.1134/S1063782618010153
- ID: 202235
Cite item
Abstract
Hybrid quantum-confined heterostructures grown by metal-organic vapor-phase epitaxy (MOVPE) via the deposition of In0.4Ga0.6As layers with various nominal thicknesses onto vicinal GaAs substrates are studied by photoluminescence spectroscopy and transmission electron microscopy. The photoluminescence spectra of these structures show the superposition of two spectral lines, which is indicative of the bimodal distribution of the size and/or shape of light-emitting objects in an array. The dominant spectral line is attributed to the luminescence of hybrid “quantum well–dot” nanostructures in the form of a dense array of relatively small quantum dots (QDs) with weak electron and hole localization. The second, lower intensity line is attributed to luminescence from a less dense array of comparatively larger QDs. Analysis of the behavior of the spectral line intensities at various temperatures showed that the density of larger QDs grows with increasing thickness of the InGaAs layer.
About the authors
A. M. Nadtochiy
St. Petersburg Academic University—Nanotechnology Research and Education Centre; Solar Dots, Ltd.; Ioffe Institute
Author for correspondence.
Email: al.nadtochy@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021; St. Petersburg, 194021; St. Petersburg, 194021
S. A. Mintairov
Ioffe Institute
Email: al.nadtochy@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021
N. A. Kalyuzhnyy
Ioffe Institute
Email: al.nadtochy@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021
S. S. Rouvimov
University of Notre Dame, Notre Dame
Email: al.nadtochy@mail.ioffe.ru
United States, Indiana, 46556
V. N. Nevedomskii
Ioffe Institute
Email: al.nadtochy@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021
M. V. Maximov
St. Petersburg Academic University—Nanotechnology Research and Education Centre; Solar Dots, Ltd.; Ioffe Institute
Email: al.nadtochy@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021; St. Petersburg, 194021; St. Petersburg, 194021
A. E. Zhukov
St. Petersburg Academic University—Nanotechnology Research and Education Centre; Solar Dots, Ltd.
Email: al.nadtochy@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021; St. Petersburg, 194021