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- W2469492045 abstract "III-nitride semiconductors are emerging as highly promising candidates for the fabrication of wide band-gap electronic and opto-electronic devices. Sapphire ({alpha}-Al{sub 2}O{sub 3}) is currently one of the primary substrates of choice for the growth of GaN despite a large lattice mismatch. Significant improvements in the quality of III-nitride layers have been demonstrated by exposure of the substrate to reactive nitrogen species followed by deposition of a low temperature AlN or GaN buffer layer. In this paper the authors present a study of the evolution of surface topography and defect microstructure of nitrided {alpha}-Al{sub 2}O{sub 3} substrates and AlN buffer layers deposited by reactive molecular beam epitaxy (RMBE). Their influence on the morphology and properties of GaN layers is also discussed. Both nitridation time and AlN deposit thickness were varied systematically, at different temperatures and buffer growth rates. The microstructures were characterized using the atomic force microscope (AFM) and transmission electron microscope (TEM). Initial growth studies are ideally suited to in-situ experiments, and further investigations are also in progress using a unique UHV TEM with the facility for in-situ RMBE." @default.
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- W2469492045 date "1997-12-31" @default.
- W2469492045 modified "2023-09-25" @default.
- W2469492045 title "Microstructures of AlN buffer layers for the growth of GaN on (0001) Al{sub 2}O{sub 3}" @default.
- W2469492045 hasPublicationYear "1997" @default.
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