Facet recovery and light emission from GaN/InGaN/GaN core-shell structures grown by metal organic vapour phase epitaxy on etched GaN nanorod arrays

Le Boulbar, E D and Gîrgel, I and Lewins, C and Edwards, P R and Martin, R W and Satka, A and Allsopp, D W E and Shields, P A (2013) Facet recovery and light emission from GaN/InGaN/GaN core-shell structures grown by metal organic vapour phase epitaxy on etched GaN nanorod arrays. Journal of Applied Physics, 114. 094302.

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    Abstract

    The use of etched nanorods from a planar template as a growth scaffold for a highly regular GaN/InGaN/GaN core-shell structure is demonstrated. The recovery of m-plane non-polar facets from etched high-aspect-ratio GaN nanorods is studied with and without the introduction of a hydrogen silsesquioxane passivation layer at the bottom of the etched nanorod arrays. This layer successfully prevented c-plane growth between the nanorods, resulting in vertical nanorod sidewalls (∼89.8°) and a more regular height distribution than re-growth on unpassivated nanorods. The height variation on passivated nanorods is solely determined by the uniformity of nanorod diameter, which degrades with increased growth duration. Facet-dependent indium incorporation of GaN/InGaN/GaN core-shell layers regrown onto the etched nanorods is observed by high-resolution cathodoluminescence imaging. Sharp features corresponding to diffracted wave-guide modes in angle-resolved photoluminescence measurements are evidence of the uniformity of the full core-shell structure grown on ordered etched nanorods.

    ORCID iDs

    Le Boulbar, E D, Gîrgel, I, Lewins, C, Edwards, P R ORCID logoORCID: https://orcid.org/0000-0001-7671-7698, Martin, R W ORCID logoORCID: https://orcid.org/0000-0002-6119-764X, Satka, A, Allsopp, D W E and Shields, P A;