Fermi level pinning in heavily neutron-irradiated GaN

A. Y. Polyakov, N. B. Smirnov, A. V. Govorkov, A. V. Markov, N. G. Kolin, D. I. Merkurisov, V. M. Boiko, K. D. Shcherbatchev, V. T. Bublik, M. I. Voronova, I. H. Lee, C. R. Lee, S. J. Pearton, A. Dabirian, A. V. Osinsky

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Abstract

Undoped n-GaN grown by two different metallorganic chemical vapor deposition (MOCVD) techniques, standard MOCVD and epitaxial lateral overgrowth, and Mg-doped p-GaN prepared by hydride vapor phase epitaxy and molecular beam epitaxy were irradiated with fast reactor neutrons to the high fluence of 1018 cm-2. In such heavily irradiated samples the Fermi level is shown to be pinned in a narrow interval of Ec - (0.8-0.95) eV, irrespective of the starting sample properties. The Fermi level pinning position correlates with the measured Schottky barrier height in n -type GaN. The results are interpreted from the standpoint of the existence of the charge neutrality level in heavily disordered material. Based on published theoretical calculations and on deep level transient spectroscopy (measurements and lattice parameter measurements in irradiated material), it is proposed that the Fermi level could be pinned between the gallium-interstitial-related deep donors near Ec -0.8 eV and nitrogen-interstitial-related acceptors near Ec -0.9 eV

Original languageEnglish
Article number093715
JournalJournal of Applied Physics
Volume100
Issue number9
DOIs
Publication statusPublished - 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Polyakov, A. Y., Smirnov, N. B., Govorkov, A. V., Markov, A. V., Kolin, N. G., Merkurisov, D. I., Boiko, V. M., Shcherbatchev, K. D., Bublik, V. T., Voronova, M. I., Lee, I. H., Lee, C. R., Pearton, S. J., Dabirian, A., & Osinsky, A. V. (2006). Fermi level pinning in heavily neutron-irradiated GaN. Journal of Applied Physics, 100(9), [093715]. https://doi.org/10.1063/1.2361157