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Screw Dislocations in MBE GaN Layers Grown on Top of HVPE Layers: Are They Different?

Published online by Cambridge University Press:  11 February 2011

Z. Liliental-Weber ,
D. Zakharov ,
J. Jasinski ,
J. Washburn ,
M. A. O'Keefe  and
H. Morkoc
Z. Liliental-Weber
Affiliation:
Lawrence Berkeley National Laboratory, Berkeley, CA 94720 m/s 62/203
D. Zakharov
Affiliation:
Lawrence Berkeley National Laboratory, Berkeley, CA 94720 m/s 62/203
J. Jasinski
Affiliation:
Lawrence Berkeley National Laboratory, Berkeley, CA 94720 m/s 62/203
J. Washburn
Affiliation:
Lawrence Berkeley National Laboratory, Berkeley, CA 94720 m/s 62/203
M. A. O'Keefe
Affiliation:
Lawrence Berkeley National Laboratory, Berkeley, CA 94720 m/s 62/203
H. Morkoc
Affiliation:
Lawrence Berkeley National Laboratory, Berkeley, CA 94720 m/s 62/203
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Abstract

Transmission Electron Microscopy was applied to study HVPE template and MBE over-layers in plan-view and cross-section. It was observed that screw dislocations in the HVPE layers are decorated by small voids arranged along the screw axis. However, no voids were observed along screw dislocations in MBE overlayers grown with excess Ga, despite the fact that Ga droplets were observed on the layer surface as well as imbedded in the layer. By applying a direct reconstruction of the phase and amplitude of the scattered electron wave from a focal series of high-resolution images, the core structures of screw dislocations in both materials have been studied and show that all screw dislocations have filled cores. Dislocation cores in MBE samples grown Ga-rich and N-rich show no substantial differences and no stoichiometric change compared to the matrix. However, in HVPE materials, single atomic columns show substantial differences in intensities and indicate the possibility of Ga presence. These Ga-rich cores might be responsible for the attraction impurities forming voids in their close vicinity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 743: Symposium L – GaN and Related Alloys , 2002 , L3.48
Copyright
Copyright © Materials Research Society 2003

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References

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