The Origin of gallium desorption transients during AlGaAs/GaAs heterointerface formation by molecular beam epitaxy

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A Monte Carlo simulation study is performed to investigate the Ga desorption behavior at AlGaAs/GaAs heterointerfaces during growth by molecular beam epitaxy. The transients in Ga desorption rate upon opening/closing the Al shutter arise due to both the change in V/III flux ratio and the Al–Ga surface exchange mechanism. It is shown that the desired “steplike” variation in Ga desorption rate at each interface can be attained by a growth procedure employing a constant V/III flux ratio.


III-V semiconductors; Aluminum compounds; Desorption; Epitaxy; Gallium arsenide; Gallium arsenide semiconductors; Heterojunctions; Interface structure; Molecular beam epitaxial growth; Molecular beam epitaxy; Monte Carlo methods; Reaction kinetics; Semiconductors—Junctions; Semiconductor growth; Semiconductor heterojunctions; Surface chemistry; Transition metal compounds


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