Simultaneous observation of luminescence and dissociation processes of Mg–H complex for Mg-doped GaN

Both luminescence properties and dissociation kinetics of Mg–H complex for as-grown Mg-doped GaN are simultaneously investigated by low-energy electron-excited nanoluminescence (LEEN) spectroscopy. Ultraviolet luminescence at 3.2–3.3 eV and blue luminescence at 2.8–2.9 eV are observed as predominant...

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Veröffentlicht in:Journal of applied physics 2002-10, Vol.92 (7), p.3657-3661
Hauptverfasser: Koide, Yasuo, Walker, D. E., White, B. D., Brillson, L. J., Murakami, Masanori, Kamiyama, S., Amano, H., Akasaki, I.
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Sprache:eng
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Zusammenfassung:Both luminescence properties and dissociation kinetics of Mg–H complex for as-grown Mg-doped GaN are simultaneously investigated by low-energy electron-excited nanoluminescence (LEEN) spectroscopy. Ultraviolet luminescence at 3.2–3.3 eV and blue luminescence at 2.8–2.9 eV are observed as predominant LEEN emissions. In-depth profiles of LEEN emission show that the blue luminescence is the predominant emission for highly Mg-doped GaN. Electron-beam exposure less than 50 mC/cm2 produces an increase of the ultraviolet luminescence intensity and reduction of the blue luminescence intensity. These characteristics suggest that the blue luminescence is due to a transition from hydrogen-related deep donor to Mg acceptor and that the ultraviolet luminescence is due to transitions from conduction band and/or shallow hydrogen donor to Mg acceptor. We propose a kinetic model for dissociation reactions of Mg–H complex during electron exposure, and the reaction rate is evaluated to be (3.5±0.3)×10−3 s−1 for electron beams with 3.1×10−5 A/cm2 at 5.0 keV.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1505988