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Ammonia-molecular-beam epitaxial growth and optical properties of GaN/AlGaN quantum wells

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5 Author(s)
Tang, H. ; National Research Council, Institute for Microstructural Sciences, Ottawa, Ontario K1A 0R6, Canada ; Webb, J.B. ; Sikora, P. ; Raymond, S.
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GaN/AlGaN quantum wells on GaN templates have been grown on (0001) sapphire substrates using the ammonia-molecular-beam epitaxy technique. The GaN template layers were of the type used previously for growing high-mobility, heterostructure field-effect transistor structures. The photoluminescence properties of the quantum wells showed strong quantum-confined Stark effect in good agreement with theoretical calculations, as well as evidence of carrier localization due to in-plane well width fluctuation. At low temperature, the quantum well emissions were dominated by two or more localized exciton levels. Carrier thermalization to the lower localized level was observed as the temperature was raised. Evidence of interwell transfer of photocarriers was observed, with the holes appearing to transfer in the direction of the internal field within the AlGaN barrier. © 2002 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:91 ,  Issue: 12 )

Date of Publication:

Jun 2002

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