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Cathodoluminescence and Photoluminescence Spectroscopy Study of Low Temperature Molecular Beam Epitaxy GaAs

Published online by Cambridge University Press:  15 February 2011

R. Enrique Viturro
Affiliation:
Xerox Webster Research Center, 114-41D, Webster, NY 14580
Michael R. Melloch
Affiliation:
School of Electrical Engineering, Purdue University, West Lafayette, IN 47907
Jerry M. Woodall
Affiliation:
IBM Research Division, P. O. Box 218, Yorktown Heights, NY 10598
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Abstract

We report a cathodoluminescence (CL) and photoluminescence (PL) study of molecular beam epitaxy grown GaAs at low substrate temperatures (LT GaAs), and semi-insulating LEC GaAs. The as grown LT GaAs material shows intense deep level emissions which can be associated with an excess concentration of Arsenic. These emissions subside with annealing for a few minutes at temperatures above 450 ° C. CL measurements clearly show an extremelly reduced concentration of traps in the post-growth 600 ° C annealed material. These results account for a diminished role of electronic point defects in controlling the insulative behavior of LT GaAs and strongly support the “buried” Schottky barrier model.

Type
Research Article
Copyright
Copyright © Materials Research Society 1992

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References

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