The restricted random dislocation distribution model to describe ensembles of dislocations with a screw component in ZnO layers with a mosaic structure

By applying the restricted random dislocation distribution model, solved using a discrete Hankel transform approach, it is shown that the shapes and characteristics of the ω-scans of the ZnO 00.2 reflection are mainly determined by the strain field introduced by dislocations with a screw component....

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Bibliographic Details
Published in:Journal of applied physics 2022-08, Vol.132 (5)
Main Authors: Schifano, R., Wierzbicka, A., Dluzewski, P., Domagala, J. Z., Wozniak, W., Kurowska, B., Bazioti, C., Guziewicz, E.
Format: Article
Language:English
Subjects:
Columnar structure
Dislocation density
Zinc oxide
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Summary:By applying the restricted random dislocation distribution model, solved using a discrete Hankel transform approach, it is shown that the shapes and characteristics of the ω-scans of the ZnO 00.2 reflection are mainly determined by the strain field introduced by dislocations with a screw component. On the other hand, no clear evidence of mosaicity or interfacial region contributions is found despite the layers exhibiting a c axis oriented residual columnar structure and a highly defective interface being present. The applied model not only permits a more precise estimation of the densities of dislocations, which present a screw component with respect to methods based on the analysis of the 00.2 peak ω-scan FWHM, but also gives an indication of their distribution characteristics with the extracted values, as well as their homogeneous/quasi-regular spacing, being confirmed by cross-sectional transmission electron microscopy observations.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0086295