Core-shell nanorods as ultraviolet light emitting diodes

Douglas Cameron, Pierre-Marie Coulon, Simon Fairclough, Gunnar Kusch, Paul R. Edwards, Norman Susilo, Tim Wernicke, Michael Kneissl, Rachel A. Oliver, Philip A. Shields, Robert W. Martin

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
24 Downloads (Pure)

Abstract

Existing barriers to efficient deep ultraviolet (UV) light-emitting diodes (LEDs) may be reduced or overcome by moving away from conventional planar growth and toward three-dimensional nanostructuring. Nanorods have the potential for enhanced doping, reduced dislocation densities, improved light extraction efficiency, and quantum wells free from the quantum-confined Stark effect. Here, we demonstrate a hybrid top-down/bottom-up approach to creating highly uniform AlGaN core-shell nanorods on sapphire repeatable on wafer scales. Our GaN-free design avoids self-absorption of the quantum well emission while preserving electrical functionality. The effective junctions formed by doping of both the n-type cores and p-type caps were studied using nanoprobing experiments, where we find low turn-on voltages, strongly rectifying behaviors and significant electron-beam-induced currents. Time-resolved cathodoluminescence measurements find short carrier liftetimes consistent with reduced polarization fields. Our results show nanostructuring to be a promising route to deep-UV-emitting LEDs, achievable using commercially compatible methods.

Original languageEnglish
Pages (from-to)1451–1458
Number of pages8
JournalNano Letters
Volume23
Issue number4
Early online date7 Feb 2023
DOIs
Publication statusPublished - 22 Feb 2023

Keywords

  • nanorods
  • LEDs
  • UV LED
  • nanowire
  • core-shell
  • AIGaN
  • semiconductors
  • electron microscopy

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