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Media type:
E-Article
Title:
Correlative analysis on InGaN/GaN nanowires: structural and optical properties of self-assembled short-period superlattices
Contributor:
Alonso-Orts, Manuel;
Hötzel, Rudolfo;
Grieb, Tim;
Auf der Maur, Matthias;
Ries, Maximilian;
Nippert, Felix;
März, Benjamin;
Müller-Caspary, Knut;
Wagner, Markus R.;
Rosenauer, Andreas;
Eickhoff, Martin
imprint:
Springer Science and Business Media LLC, 2023
Published in:Discover Nano
Language:
English
DOI:
10.1186/s11671-023-03808-6
ISSN:
2731-9229
Origination:
Footnote:
Description:
<jats:title>Abstract</jats:title><jats:p>The influence of self-assembled short-period superlattices (SPSLs) on the structural and optical properties of InGaN/GaN nanowires (NWs) grown by PAMBE on Si (111) was investigated by STEM, EDXS, <jats:italic>µ</jats:italic>-PL analysis and <jats:bold>k·p</jats:bold> simulations. STEM analysis on single NWs indicates that in most of the studied nanostructures, SPSLs self-assemble during growth. The SPSLs display short-range ordering of In-rich and In-poor In<jats:sub><jats:italic>x</jats:italic></jats:sub>Ga<jats:sub>1-<jats:italic>x</jats:italic></jats:sub>N regions with a period of 2–3 nm that are covered by a GaN shell and that transition to a more homogenous In<jats:sub><jats:italic>x</jats:italic></jats:sub>Ga<jats:sub>1-<jats:italic>x</jats:italic></jats:sub>N core. Polarization- and temperature-resolved PL analysis performed on the same NWs shows that they exhibit a strong parallel polarized red-yellow emission and a predominantly perpendicular polarized blue emission, which are ascribed to different In-rich regions in the nanostructures. The correlation between STEM, <jats:italic>µ</jats:italic>-PL and <jats:bold>k·p</jats:bold> simulations provides better understanding of the rich optical emission of complex III-N nanostructures and how they are impacted by structural properties, yielding the significant impact of strain on self-assembly and spectral emission.</jats:p>
<jats:p><jats:bold>Graphical abstract</jats:bold></jats:p>