Roles for aluminium indium nitride insertion layers in fabrication of GaN-based microcavities

K. Bejtka, F. Rizzi, P.R. Edwards, R.W. Martin, E. Gu, M.D. Dawson, I.M. Watson, I.R. Sellers, F. Semond

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15 Citations (Scopus)


AlInN alloys achieve an in-plane lattice match to hexagonal GaN at an indium nitride mole fraction of 18%. Meanwhile Al0.82In0.18N displays a refractive index contrast of 7% with GaN at visible wavelengths. We illustrate the use of Al0.82In0.18N insertion layers to control layer thicknesses during homoepitaxial growth of GaN-based microcavities, using in situ optical reflectometry. The structures discussed are 3 /2 microcavities incorporating distributed InGaN quantum wells tailored for emission at 400 nm. As-grown samples have been characterised by techniques including cathodoluminescence spectroscopy. In addition to their role in growth monitoring, there are several post-growth processing steps in which Al0.82In0.18N insertion layers can assist microcavity fabrication. We focus here on a demonstration of the 1:5 etch rate selectivity obtainable between Al0.82In0.18</SUB >N and GaN in reactive ion etching
Original languageEnglish
Pages (from-to)2648-2652
Number of pages4
JournalPhysica Status Solidi A: Applications and Materials Science
Issue number14
Publication statusPublished - 4 Nov 2005


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  • lasers
  • 81.65.Cn
  • 81.15.Gh,
  • 81.05.Ea,
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