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Journal of Electronic Materials

, Volume 42, Issue 5, pp 868–874 | Cite as

Toward Discrete Axial pn Junction Nanowire Light-Emitting Diodes Grown by Plasma-Assisted Molecular Beam Epitaxy

  • Matt D. BrubakerEmail author
  • Paul T. Blanchard
  • John B. Schlager
  • Aric W. Sanders
  • Andrew M. Herrero
  • Alexana Roshko
  • Shannon M. Duff
  • Todd E. Harvey
  • Victor M. Bright
  • Norman A. Sanford
  • Kris A. Bertness
Article

In this paper we investigate axial pn junction GaN nanowires grown by plasma-assisted molecular beam epitaxy (MBE), with particular attention to the effect of Mg doping on the device characteristics of individual nanowire light-emitting diodes (LEDs). We observe that a significant fraction of single-nanowire LEDs produce measurable band-gap electroluminescence when a thin AlGaN electron blocking layer (EBL) is incorporated into the device structure near the junction. Similar devices with no EBL typically yield below-detection-limit electroluminescence, despite diode-like IV characteristics and optically measured internal quantum efficiencies (IQEs) of ∼1%. IV measurements of the p-regions in pn junction nanowires, as well as nanowires doped with Mg only, indicate low p-type conductivity and asymmetric Schottky-like p-contacts. These observations suggest that imbalanced carrier injection from the junction and p-contact can produce significant nonradiative losses.

Keywords

Gallium nitride nanowires light-emitting diodes molecular beam epitaxy 

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Copyright information

© TMS (outside the USA) 2013

Authors and Affiliations

  • Matt D. Brubaker
    • 1
    • 2
    Email author
  • Paul T. Blanchard
    • 1
  • John B. Schlager
    • 1
  • Aric W. Sanders
    • 1
  • Andrew M. Herrero
    • 1
  • Alexana Roshko
    • 1
  • Shannon M. Duff
    • 1
  • Todd E. Harvey
    • 1
  • Victor M. Bright
    • 2
  • Norman A. Sanford
    • 1
  • Kris A. Bertness
    • 1
  1. 1.Physical Measurement LaboratoryNational Institute of Standards and TechnologyBoulderUSA
  2. 2.Department of Mechanical EngineeringUniversity of ColoradoBoulderUSA

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