X-ray diffraction peak profiles from threading dislocations in GaN epitaxial films

Details X-ray diffraction peak profiles from threading dislocations in GaN epitaxial films X-ray diffraction peak profiles from threading dislocations in GaN epitaxial films

2004-10-20

arxiv.org/abs/cond-mat/0410510v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevB.72.045423

We analyze the lineshape of x-ray diffraction profiles of GaN epitaxial layers with large densities of randomly distributed threading dislocations. The peaks are Gaussian only in the central, most intense part of the peak, while the tails obey a power law. The $q^{-3}$ decay typical for random dislocations is observed in double-crystal rocking curves. The entire profile is well fitted by a restricted random dislocation distribution. The densities of both edge and screw threading dislocations and the ranges of dislocation correlations are obtained.

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