Indium incorporation in quaternary Inx Aly Ga1-x-y N for UVB-LEDs

Johannes Enslin, Tim Wernicke, Anna Lobanova, Gunnar Kusch, Lucia Spasevski, Tolga Teke, Bettina Belde, Robert W. Martin, Roman Talalaev, Michael Kneissl

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Abstract

Consistent studies of the quaternary composition are rare as it is impossible to fully determine the quaternary composition by X-ray diffraction or deduce it from that of ternary alloys. In this paper we determined the quaternary composition by wavelength dispersive X-ray spectroscopy of Inx Aly layers grown by metal organic vapor phase epitaxy. Further insights explaining the peculiarities of Inx Aly Ga1-x-yN growth in a showerhead reactor were gained by simulations of the precursor decomposition, gas phase adduct formation and indium incorporation including desorption. The measurements and simulations agree very well showing that the indium incorporation in a range from 0% to 2% is limited by desorption which is enhanced by the compressive strain to the relaxed Al0.5Ga0.5N buffer layer as well as indium incorporation into AlN particles forming in the gas phase. Utilizing Inx Aly Ga1-x-yN layers containing 2% of indium for multiple quantum wells (MQWs), it was possible to show an almost five times higher photoluminescence intensity of InAlGaN MQWs in comparison to AlGaN MQWs.

Original languageEnglish
Article numberSC1004
Number of pages5
JournalJapanese Journal of Applied Physics
Volume58
Issue numberSC
Early online date16 Apr 2019
DOIs
Publication statusPublished - 16 Apr 2019

Keywords

  • quaternary composition
  • X-ray spectroscopy
  • X-ray diffraction
  • UVB
  • ultraviolet light
  • light emitting diodes
  • LEDs

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    Enslin, J., Wernicke, T., Lobanova, A., Kusch, G., Spasevski, L., Teke, T., Belde, B., Martin, R. W., Talalaev, R., & Kneissl, M. (2019). Indium incorporation in quaternary Inx Aly Ga1-x-y N for UVB-LEDs. Japanese Journal of Applied Physics, 58(SC), [SC1004]. https://doi.org/10.7567/1347-4065/ab07a4