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Proceedings Paper

Defect and emission distributions in bulk GaN grown in polar and nonpolar directions: a comparative analysis
Author(s): T. Paskova; A. Hanser; E. Preble; K. Evans; R. Kröger; F. Tuomisto; R. Kersting; R. Alcorn; S. Ashley; C. Pagel; E. Valcheva; P. P. Paskov; B. Monemar
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Paper Abstract

We have investigated bulk GaN material grown by HVPE either in the conventional polar [0001] direction and subsequently sliced with nonpolar surfaces or grown in the nonpolar [11-20] direction. Spatially resolved techniques such as cathodoluminescence imaging and transmission electron microscopy, as well as profile measuring techniques such as positron annihilation spectroscopy and secondary ion mass spectroscopy were employed to directly visualize the extended structural defects, and point defect (impurity and vacancy) distributions along the growth axes. A comparative analysis of the results shows a distinctive difference in the distribution of all kind of defects along the growth axes. A significant decrease in the defect density in material grown along the polar direction, in contrast to the constant behavior of the high defect density in material grown along the nonpolar direction points out the low-defect superior quality of the former material and indicates the preferable way of producing high-quality GaN substrates with nonpolar surfaces.

Paper Details

Date Published: 15 February 2008
PDF: 7 pages
Proc. SPIE 6894, Gallium Nitride Materials and Devices III, 68940D (15 February 2008); doi: 10.1117/12.767628
Show Author Affiliations
T. Paskova, Kyma Technologies, Inc. (United States)
A. Hanser, Kyma Technologies, Inc. (United States)
E. Preble, Kyma Technologies, Inc. (United States)
K. Evans, Kyma Technologies, Inc. (United States)
R. Kröger, Univ. of York (United Kingdom)
F. Tuomisto, Helsinki Univ. of Technology (Finland)
R. Kersting, Tascon GmbH (Germany)
R. Alcorn, NSWC Crane (United States)
S. Ashley, NSWC Crane (United States)
C. Pagel, NSWC Crane (United States)
E. Valcheva, Linköping Univ. (Sweden)
P. P. Paskov, Linköping Univ. (Sweden)
B. Monemar, Linköping Univ. (Sweden)

Published in SPIE Proceedings Vol. 6894:
Gallium Nitride Materials and Devices III
Hadis Morkoç; Cole W. Litton; Jen-Inn Chyi; Yasushi Nanishi; Euijoon Yoon, Editor(s)

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