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TEM Investigation of Arsenic Precipitates in Semi-Insulating GaAs

Published online by Cambridge University Press:  15 February 2011

S. Yegnasubramanian  and
M. A. Shahid
S. Yegnasubramanian
Affiliation:
AT&T Bell Laboratories Princeton, New Jersey 08540
M. A. Shahid
Affiliation:
AT&T Bell Laboratories Princeton, New Jersey 08540
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Abstract

This paper presents a TEM investigation of undoped, semi-insulating GaAs crystals grown by the VGF (vertical gradient freeze) technique for microstructure and defects characterization. Energy dispersive X-ray spectrometry (EDS) and selected area electron diffraction (SAD) were used to characterize for composition and lattice spacings, respectively. TEM images of dislocations decorated with precipitate particles are presented. The particles were found to be arsenic rich. Regions of fine particulates were identified and a Moire pattern analysis was carried out. The occurrence of such defects in the low dislocation density VGF GaAs of the present study suggests that these are material related and not necessarily dependent on the growth technique.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 225: Symposium G – Materials Reliability Issues in Microelectronics , 1991 , 283
Copyright
Copyright © Materials Research Society 1991

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References

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