Preprint Open Access

Insights into image contrast from dislocations in ADF-STEM

Oveisi, E; Spadaro, M.C.; Rotunno, Enzo; Grillo, Vincenzo; Hébert, C


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    <subfield code="a">&lt;p&gt;Competitive mechanisms contribute to image contrast from dislocations in annular dark-field scanning&amp;nbsp;&lt;a href="https://www.sciencedirect.com/topics/physics-and-astronomy/transmission-electron-microscopy"&gt;transmission electron microscopy&lt;/a&gt;&amp;nbsp;(ADF-STEM). A clear theoretical understanding of the mechanisms underlying the ADF-STEM contrast is therefore essential for correct interpretation of dislocation images. This paper reports on a systematic study of the ADF-STEM contrast from dislocations in a GaN specimen, both experimentally and computationally. Systematic experimental ADF-STEM images of the edge-character dislocations reveal a number of characteristic contrast features that are shown to depend on both the angular detection range and specific position of the dislocation in the sample. A theoretical model based on electron channelling and Bloch-wave scattering theories, supported by numerical simulations based on Grillo&amp;#39;s strain-channelling equation, is proposed to elucidate the physical origin of such complex contrast phenomena.&lt;/p&gt;</subfield>
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