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Ex Situ and in Situ Methods for Oxide and Carbon Removal from AlN and GaN Surfaces

Published online by Cambridge University Press:  21 February 2011

Sean W. King
Affiliation:
Department of Materials Science and Engineering
Laura L. Smith
Affiliation:
Department of Materials Science and Engineering
John P. Barnak
Affiliation:
Department of Materials Science and Engineering
Ja-Hum Ku
Affiliation:
Department of Physics North Carolina State University, Raleigh, NC 27695.
Jim A. Christman
Affiliation:
Department of Physics North Carolina State University, Raleigh, NC 27695.
Mark C. Benjamin
Affiliation:
Department of Physics North Carolina State University, Raleigh, NC 27695.
Michael D. Bremser
Affiliation:
Department of Materials Science and Engineering
Robert J. Nemanich
Affiliation:
Department of Physics North Carolina State University, Raleigh, NC 27695.
Robert F. Davis
Affiliation:
Department of Materials Science and Engineering
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Abstract

Exposure to numerous acids and bases and UV/O3 oxidation were used to determine the best ex situ cleaning techniques for the (0001) surfaces of AIN and GaN. HF and HCI were the most effective in removing the oxide from AIN and GaN, respectively. However, AES and XPS revealed the surfaces to be terminated with F and CI which inhibited re-oxidation prior to loading into vacuum. TPD showed mat temperatures of 650 and 850°C are necessary to thermally desorb the CI and F, respectively. UV/O3 oxidation in air was not effective in removing hydrocarbons from either surface but was effective for oxide growth. In situ remote hydrogen plasma exposure at 450°C removed halogens and hydrocarbons remaining after ex situ cleaning of both AIN and GaN surfaces; however, oxide free surfaces could not be achieved. Thermal desorption of hydrocarbons from GaN in UHV was achieved at 650°C. Complete thermal desorption of the surface oxide in UHV was only achieved at temperatures > 800°C where some GaN decomposition occurred. Annealing GaN in NH3 at 700°C reduced the surface oxide without loss of surface stoichiometry.

Type
Research Article
Copyright
Copyright © Materials Research Society 1996

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References

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Ex Situ and in Situ Methods for Oxide and Carbon Removal from AlN and GaN Surfaces
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