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Title

Cathodoluminescence study of Mg activation in non-polar and semi-polar faces of undoped/Mg-doped GaN core-shell nanorods

AuthorsHortelano, V.; Martínez, O.; Cuscó, Ramón ; Artús, Lluís ; Jiménez, Juan
Keywordsacceptor activation
cathodoluminescence
GaN
Mg-doping
nanorods
non-polar faces
Issue Date2016
PublisherInstitute of Physics Publishing
CitationNanotechnology, 27(9): 095706 (2016)
AbstractSpectrally and spatially resolved cathodoluminescence (CL) measurements were carried out at 80 K on undoped/Mg-doped GaN core-shell nanorods grown by selective area growth metalorganic vapor phase epitaxy in order to investigate locally the optical activity of the Mg dopants. A study of the luminescence emission distribution over the different regions of the nanorods is presented. We have investigated the CL fingerprints of the Mg incorporation into the non-polar lateral prismatic facets and the semi-polar facets of the pyramidal tips. The amount of Mg incorporation/activation was varied by using several Mg/Ga flow ratios and post-growth annealing treatment. For lower Mg/Ga flow ratios, the annealed nanorods clearly display a donor-acceptor pair band emission peaking at 3.26-3.27 eV and up to 4 LO phonon replicas, which can be considered as a reliable indicator of effective p-type Mg doping in the nanorod shell. For higher Mg/Ga flow ratios, a substantial enhancement of the yellow luminescence emission as well as several emission subbands are observed, which suggests an increase of disorder and the presence of defects as a consequence of the excess Mg doping.
Publisher version (URL)http://dx.doi.org/10.1088/0957-4484/27/9/095706
URI10261/129533
DOI10.1088/0957-4484/27/9/095706
ISSN0957-4484
E-ISSN1361-6528
Appears in Collections:(ICTJA) Artículos
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