Strain in cracked AlGaN layers
- 1 July 2002
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 92 (1) , 118-123
- https://doi.org/10.1063/1.1481969
Abstract
The strain relaxation due to cracks of different depths in AlGaN layers grown on GaN template layers has been investigated using spatially resolved cathodoluminescence spectroscopy, high-resolution x-ray diffraction and two-dimensional finite element simulations. The experimental data consistently show that the relief of tensile stress increases with decreasing crack spacing. The measured strain profiles between the cracks are well described by the theoretical calculations for small crack spacings; whereas, deviations for larger crack spacings have been found. The latter is discussed in terms of inelastic strain relaxation mechanisms, the reliability of the deformation potential for AlGaN employed in this article, and the spatial variations in the properties of the AlGaN, e.g., its composition.This publication has 18 references indexed in Scilit:
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