Optical characterization of magnesium incorporation in p-GaN layers for core-shell nanorod light-emitting diodes

I. Gîrgel, A. Šatka, J. Priesol, P. M. Coulon, E. D. Le Boulbar, T. Batten, D. W.E. Allsopp, P. A. Shields

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

III-nitride nanostructures are of interest for a new generation of light-emitting diodes (LEDs). However, the characterization of doping incorporation in nanorod (NR) structures, which is essential for creating the p-n junction diodes, is extremely challenging. This is because the established electrical measurement techniques (such as capacitance-voltage or Hall-effect methods) require a simple sample geometry and reliable ohmic contacts, both of which are difficult to achieve in nanoscale devices. The need for homogenous, conformal n-type or p-type layers in core-shell nanostructures magnifies these challenges. Consequently, we demonstrate how a combination of non-contact methods (micro-photoluminescence, micro-Raman and cathodoluminescence), as well as electron-beam-induced-current, can be used to analyze the uniformity of magnesium incorporation in core-shell NRs and make a first estimate of doping levels by the evolution of band transitions, strain and current mapping. These techniques have been used to optimize the growth of core-shell nanostructures for electrical carrier injection, a significant milestone for their use in LEDs.

Original languageEnglish
Article number155103
JournalJournal of Physics D: Applied Physics
Volume51
Issue number15
DOIs
Publication statusPublished - 20 Mar 2018

Fingerprint

Nanorods
Magnesium
nanorods
Light emitting diodes
magnesium
Nanostructures
light emitting diodes
Doping (additives)
junction diodes
Cathodoluminescence
Ohmic contacts
carrier injection
Induced currents
Hall effect
cathodoluminescence
p-n junctions
Nitrides
electrical measurement
nitrides
electric contacts

Keywords

  • cathodoluminescence
  • core-shell
  • doping
  • EBIC
  • nanorod
  • p-GaN

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Cite this

Optical characterization of magnesium incorporation in p-GaN layers for core-shell nanorod light-emitting diodes. / Gîrgel, I.; Šatka, A.; Priesol, J.; Coulon, P. M.; Le Boulbar, E. D.; Batten, T.; Allsopp, D. W.E.; Shields, P. A.

In: Journal of Physics D: Applied Physics, Vol. 51, No. 15, 155103, 20.03.2018.

Research output: Contribution to journalArticle

Gîrgel, I. ; Šatka, A. ; Priesol, J. ; Coulon, P. M. ; Le Boulbar, E. D. ; Batten, T. ; Allsopp, D. W.E. ; Shields, P. A. / Optical characterization of magnesium incorporation in p-GaN layers for core-shell nanorod light-emitting diodes. In: Journal of Physics D: Applied Physics. 2018 ; Vol. 51, No. 15.
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