Effect of the barrier growth mode on the luminescence and conductivity micron scale uniformity of InGaN light emitting diodes

M. J. Wallace, P. R. Edwards, M. J. Kappers, M. A. Hopkins, F. Oehler, S. Sivaraya, R. A. Oliver, C. J. Humphreys, D. W. E. Allsopp, R. W. Martin

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Abstract

In this paper we present a combined cathodoluminescence and electron beam induced current study of the optical and electrical properties of InGaN LEDs grown using different active region growth methods. In one device, both the quantum wells and quantum barriers were deposited at their optimum temperatures (2T) whereas in the other device, each barrier was grown in a two step process, with the first few nanometers at a lower temperature (Q2T). It was found that, in the Q2T sample, small micron scale domains of lower emission intensity correlate strongly to a lower EBIC signal, whereas in the 2T sample which has a more uniform emission pattern and an anti-correlation exists between CL emission intensity and EBIC signal.
Original languageEnglish
Article number115705
Number of pages6
JournalJournal of Applied Physics
Volume 117
Issue number11
Early online date20 Mar 2015
DOIs
Publication statusPublished - 2015

Keywords

  • cathodoluminescence
  • light emitting diode
  • electron beams

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