Hybrid top-down/bottom-up fabrication of regular arrays of AlN nanorods for deep-UV core-shell LEDs

Pierre-Marie Coulon, Gunnar Kusch, Emmanuel Le Boulbar, Pierre Chausse, C. G. Bryce, R. W. Martin, Philip Shields

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Abstract

Core–shell nanostructures are predicted to highly improve the efficiency of deep-UV light emitting diodes (LEDs), owing to their low defect density, reduced quantum-confined Stark effect, high-quality non-polar growth and improved extraction efficiency. In this paper, we report on the nanofabrication of high-quality AlN nanorod arrays using a hybrid top-down/bottom-up approach for use as a scaffold for UV LED structures. We describe the use of Displacement Talbot Lithography to fabricate a metallic hard etch mask to allow AlN nanorod arrays to be dry etched from a planar AlN template. In particular, we investigate the impact of etching parameters on the nanorod etch rate, tapering profile and mask selectivity in order to achieve vertical-sided nanorod arrays with high aspect ratios. AlN facet recovery is subsequently explored by means of regrowth using Metal Organic Vapor Phase Epitaxy. Low pressure and high V/III ratio promote straight and smooth sidewall faceting, which results in an improvement of the optical quality compared to the initial AlN template. The promising results open new perspectives for the fabrication of high-efficiency deep-UV-emitting core–shell LEDs.
Original languageEnglish
Article number1700445
Number of pages9
JournalPhysica Status Solidi (B)
Volume255
Issue number5
Early online date30 Nov 2017
DOIs
Publication statusPublished - 1 May 2018

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    Hybrid top-down/bottom-up fabrication of regular arrays of AlN nanorods for deep-UV core-shell LEDs: Dataset

    Coulon, P. (Creator), Kusch, G. (Creator), Kusch, G. (Researcher), Le Boulbar, E. (Researcher), Chausse, P. (Other), Bryce, C. (Other), Martin, R. W. (Project Member) & Shields, P. (Project Leader), University of Bath, 2017

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