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AlGaN Nanostructures with Extremely High Room-Temperature Internal Quantum Efficiency of Emission Below 300 nm
Ioffe Institute, Russia.
Ioffe Institute, Russia.
Ioffe Institute, Russia.
Ioffe Institute, Russia.
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2017 (English)In: Journal of Electronic Materials, ISSN 0361-5235, E-ISSN 1543-186X, Vol. 46, no 7, 3888-3893 p.Article in journal (Refereed) Published
Abstract [en]

We present theoretical optimization of the design of a quantum well (QW) heterostructure based on AlGaN alloys, aimed at achievement of the maximum possible internal quantum efficiency of emission in the mid-ultraviolet spectral range below 300 nm at room temperature. A sample with optimized parameters was fabricated by plasma-assisted molecular beam epitaxy using the submonolayer digital alloying technique for QW formation. High-angle annular dark-field scanning transmission electron microscopy confirmed strong compositional disordering of the thus-fabricated QW, which presumably facilitates lateral localization of charge carriers in the QW plane. Stress evolution in the heterostructure was monitored in real time during growth using a multibeam optical stress sensor intended for measurements of substrate curvature. Time-resolved photoluminescence spectroscopy confirmed that radiative recombination in the fabricated sample dominated in the whole temperature range up to 300 K. This leads to record weak temperature-induced quenching of the QW emission intensity, which at 300 K does not exceed 20% of the low-temperature value.

Place, publisher, year, edition, pages
SPRINGER , 2017. Vol. 46, no 7, 3888-3893 p.
Keyword [en]
AlGaN; quantum wells; excitons; molecular beam epitaxy
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-138882DOI: 10.1007/s11664-016-5091-3ISI: 000403016800012OAI: oai:DiVA.org:liu-138882DiVA: diva2:1115956
Note

Funding Agencies|Russian Foundation for Basic Research [15-02-05206a]

Available from: 2017-06-27 Created: 2017-06-27 Last updated: 2017-06-27

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Thin Film PhysicsFaculty of Science & Engineering
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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
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  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
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