Boson Peak Related to Ga Nanoclusters in AlGaN Layers Grown by Plasma-Assisted Molecular Beam Epitaxy at Ga-Rich Conditions View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2019-11-06

AUTHORS

V. Yu. Davydov, V. N. Jmerik, E. M. Roginskii, Yu. E. Kitaev, Y. M. Beltukov, M. B. Smirnov, D. V. Nechaev, A. N. Smirnov, I. A. Eliseyev, P. N. Brunkov, S. V. Ivanov

ABSTRACT

We report the results of systematic Raman spectroscopy studies of AlxGa1 –xN (x ~ 0.75) layers grown using plasma-assisted molecular beam epitaxy at various stoichiometric conditions and growth fluxes. The high-intensity asymmetric low-frequency peak obeying Bose statistics is discovered in Raman spectra of the layers grown by temperature-modulated epitaxy at strongly Ga-enriched conditions. Theoretical model is developed to explain the origin and the high intensity of the observed low-frequency peak, which is attributed to the presence of excessive metallic gallium in AlGaN layers and can be explained by vibrations of gallium clusters with a diameter of ~1 nm. The nature of the low-frequency peak is similar to that of the boson peak in glasses, which occupies the same frequency range in Raman spectra. We demonstrate the capabilities of Raman spectroscopy as an express and non-destructive technique for optimization of growth conditions of AlGaN layers to achieve simultaneously the atomically-smooth droplet-free surface morphology and the high structural quality. More... »

PAGES

1479-1488

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s1063782619110058

DOI

http://dx.doi.org/10.1134/s1063782619110058

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1122360708


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