Effects of quantum well growth temperature on the recombination efficiency of InGaN/GaN multiple quantum wells that emit in the green and blue spectral regions

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Hammersley, S and Kappers, M. J. and Massabuau, F. C.-P. and Sahonta, S and Dawson, P and Oliver, R. A. and Humphreys, C. J. (2015) Effects of quantum well growth temperature on the recombination efficiency of InGaN/GaN multiple quantum wells that emit in the green and blue spectral regions. Applied Physics Letters, 107 (132106). 132106. ISSN 0003-6951

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Abstract

nGaN-based light emitting diodes and multiple quantum wells designed to emit in the green spectral region exhibit, in general, lower internal quantum efficiencies than their blue-emitting counter parts, a phenomenon referred to as the “green gap.” One of the main differences between green-emitting and blue-emitting samples is that the quantum well growth temperature is lower for structures designed to emit at longer wavelengths, in order to reduce the effects of In desorption. In this paper, we report on the impact of the quantum well growth temperature on the optical properties of InGaN/GaN multiple quantum wells designed to emit at 460 nm and 530 nm. It was found that for both sets of samples increasing the temperature at which the InGaN quantum well was grown, while maintaining the same indium composition, led to an increase in the internal quantum efficiency measured at 300 K. These increases in internal quantum efficiency are shown to be due reductions in the non-radiative recombination rate which we attribute to reductions in point defect incorporation.

ORCID iDs

Hammersley, S, Kappers, M. J., Massabuau, F. C.-P. ORCID logoORCID: https://orcid.org/0000-0003-1008-1652, Sahonta, S, Dawson, P, Oliver, R. A. and Humphreys, C. J.;
  • Item type:Article
    ID code:79441
    Dates:
    Date
    Event
    1 October 2015
    Published
    22 September 2015
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:03 Feb 2022 11:54
    Last modified:11 Nov 2024 13:22
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/79441
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