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Effect of template morphology on the efficiency of InGaN/GaN quantum wells and light-emitting diodes grown by molecular-beam epitaxy

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5 Author(s)
Tang, H. ; Institute for Microstructural Sciences, National Research Council Canada, Ottawa, Ontario, Canada K1A 0R6 ; Haffouz, S. ; Powell, A. ; Bardwell, J.A.
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The pronounced enhancement of indium incorporation efficiency for InGaN/GaN quantum wells due to the rough, faceted surface of the GaN template grown in situ by ammonia-molecular-beam epitaxy is reported. The InGaN/GaN quantum wells are grown by plasma-assisted molecular-beam epitaxy. Unlike the smooth (0002) surface of GaN template layers grown by metalorganic chemical vapor deposition, the surface of the template layers grown by ammonia-molecular-beam epitaxy is defined by {10-1m} pyramidal facets causing significant surface roughness. The drastically enhanced indium incorporation rate associated with the rough templates allows the InGaN/GaN quantum wells to be grown at higher temperatures as it compensates for the increased thermal decomposition. High luminescence efficiency is achieved as a result. Using such efficient InGaN/GaN quantum wells, light-emitting diodes have been grown entirely by molecular-beam epitaxy on sapphire substrates, demonstrating output power of 0.22 mW for 20 mA injection current.

Published in:

Applied Physics Letters  (Volume:86 ,  Issue: 12 )

Date of Publication:

Mar 2005

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