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Adsorption and desorption kinetics of Ga on GaN(0001): Application of Wolkenstein theory

dc.contributor.author Brown, April S
dc.contributor.author Bruno, G
dc.contributor.author Kim, TH
dc.contributor.author Losurdo, M
dc.date.accessioned 2011-06-21T17:27:45Z
dc.date.issued 2010-08-26
dc.identifier.issn 1098-0121
dc.identifier.uri http://hdl.handle.net/10161/4255
dc.description.abstract The kinetics of Ga adsorption/desorption on GaN(0001) surfaces is investigated over the temperature range of 680-750°C using real-time spectroscopic ellipsometry. The adsorption and desorption kinetics are described in the framework of the Wolkenstein theory, which considers not only the equilibrium between Ga adsorbed on the surface and Ga in the gas phase but also the electronic equilibrium at the surface. It is shown that, because of the fixed polarization charge existing at the GaN(0001) surface, Ga adsorption and desorption processes involve neutral and charged Ga states. By considering the GaN surface charge involved in the surface processes, we demonstrate that a second-order kinetics more accurately describes Ga desorption, in comparison with conventional models, and yields an apparent activation energy of 2.85±0.02eV for Ga desorption consistent with experiments. © 2010 The American Physical Society.
dc.language.iso en_US
dc.relation.ispartof Physical Review B - Condensed Matter and Materials Physics
dc.relation.isversionof 10.1103/PhysRevB.82.075326
dc.title Adsorption and desorption kinetics of Ga on GaN(0001): Application of Wolkenstein theory
dc.title.alternative
dc.type Journal article
dc.description.version Version of Record
duke.date.pubdate 2010-8-26
duke.description.issue 7
duke.description.volume 82
dc.relation.journal Physical Review B
pubs.begin-page 75326
pubs.issue 7
pubs.organisational-group Duke
pubs.organisational-group Electrical and Computer Engineering
pubs.organisational-group Pratt School of Engineering
pubs.publication-status Published
pubs.volume 82
dc.identifier.eissn 1550-235X


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