Vapour Liquid Solid Growth Effects on InGaN Epilayers Composition Uniformity in Presence of Metal Droplets

Mani Azadmand; Stefano Vichi; Federico Guido Cesura; Sergio Bietti; Daniel Chrastina; Emiliano Bonera; Giovanni Maria Vanacore; Shiro Tsukamoto; Stefano Sanguinetti

doi:10.3390/nano12213887

,

and

¹

Department of Materials Science, University of Milano-Bicocca, 20100 Milano, Italy

²

INFN, Sezione di Milano-Bicocca, 20100 Milano, Italy

³

L-NESS, Physics Department, Politecnico di Milano, Via Anzani 42, 22100 Como, Italy

^*

Author to whom correspondence should be addressed.

Nanomaterials2022, 12(21), 3887;https://doi.org/10.3390/nano12213887

This article belongs to the Section Synthesis, Interfaces and Nanostructures

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Abstract

We investigated the composition uniformity of InGaN epilayers in presence of metal droplets on the surface. We used Plasma Assisted MBE to grow an InGaN sample partially covered by metal droplets and performed structural and compositional analysis. The results showed a marked difference in indium incorporation between the region under the droplets and between them. Based on this observation we proposed a theoretical model able to explain the results by taking into account the vapour liquid solid growth that takes place under the droplet by direct impingement of nitrogen adatoms.

Keywords:

InGaN; molecular beam epitaxy; metal droplets; vapor–liquid–solid

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