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Optical and structural characterisation of epitaxial nanoporous GaN grown by CVD
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Accepted version
Date
2017-08-21
Authors
Mena, Josue
Carvajal, Joan J.
Martínez, O.
Jiménez, J.
Zubialevich, Vitaly Z.
Parbrook, Peter J.
Diaz, Francesc
Aguilo, Magdalena
Journal Title
Journal ISSN
Volume Title
Publisher
IOP Publishing
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Abstract
In this paper we study the optical properties of nanoporous gallium nitride (GaN) epitaxial layers grown by chemical vapour deposition on non-porous GaN substrates, using photoluminescence, cathodoluminescence, and resonant Raman scattering, and correlate them with the structural characteristic of these films. We pay special attention to the analysis of the residual strain of the layers and the influence of the porosity in the light extraction. The nanoporous GaN epitaxial layers are under tensile strain, although the strain is progressively reduced as the deposition time and the thickness of the porous layer increases, becoming nearly strain free for a thickness of 1.7 μm. The analysis of the experimental data point to the existence of vacancy complexes as the main source of the tensile strain.
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Keywords
GaN , Porous materials , Structural stress , Optical characterisation
Citation
Mena, J., Carvajal, J. J., Martínez, O., Jiménez, J., Zubialevich. V. Z., Parbrook, P. J., Diaz, F. and Aguiló, M. (2017)'Optical and structural characterisation of epitaxial nanoporous GaN grown by CVD', Nanotechnology, 28(37) 375701. doi:10.1088/1361-6528/aa7e9d
Copyright
© 2017 IOP Publishing Ltd. This is an author-created, un-copyedited version of an article accepted for publication in Nanotechnology. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-6528/aa7e9d