Adsorption and desorption kinetics of Ga on GaN(0001): Application of Wolkenstein theory
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2010-08-26
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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.
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Bruno, G, M Losurdo, TH Kim and A Brown (2010). Adsorption and desorption kinetics of Ga on GaN(0001): Application of Wolkenstein theory. Physical Review B - Condensed Matter and Materials Physics, 82(7). p. 75326. 10.1103/PhysRevB.82.075326 Retrieved from https://hdl.handle.net/10161/4255.
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April S. Brown
Dr. April Brown received her B.S.E.E. from North Carolina State University in 1981, her M.S.E.E. and Ph.D. from Cornell University in 1984 and 1985, respectively. She worked at the Hughes Research Laboratories (now HRL LLC) in Malibu, Ca. from 1986-1993, and spent one year at the Army Research Office in the Physics Division (1988). She joined the Georgia Institute of Technology in 1994 as an Associate Professor and was promoted to Professor in 1999. She was Associate Dean in the College of Engineering from 1999-2001 and Executive Assistant to the President from 2001-2002. In addition, she was named Pettit Professor in Microelectronics in 2001. She joined Duke University as Professor and Chair in July 2002.
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