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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

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Rapid nondestructive analysis of threading dislocations in wurtzite materials using the scanning electron microscope

Gunasekar, Naresh and Hourahine, Benjamin and Edwards, Paul and Day, A.P. and Winkelmann, Aimo and Wilkinson, A.J. and Parbrook, P.J. and England, G. and Trager-Cowan, Carol (2012) Rapid nondestructive analysis of threading dislocations in wurtzite materials using the scanning electron microscope. Physical Review Letters, 108 (13). ISSN 0031-9007

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We describe the use of electron channeling contrast imaging in the scanning electron microscope to rapidly and reliably image and identify threading dislocations (TDs) in materials with the wurtzite crystal structure. In electron channeling contrast imaging, vertical TDs are revealed as spots with black-white contrast. We have developed a simple geometric procedure which exploits the differences observed in the direction of this black-white contrast for screw, edge, and mixed dislocations for two electron channeling contrast images acquired from two symmetrically equivalent crystal planes whose g vectors are at 120° to each other. Our approach allows unambiguous identification of all TDs without the need to compare results with dynamical simulations of channeling contrast.