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Insights into image contrast from dislocations in ADF-STEM

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


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{
  "description": "<p>Competitive mechanisms contribute to image contrast from dislocations in annular dark-field scanning&nbsp;<a href=\"https://www.sciencedirect.com/topics/physics-and-astronomy/transmission-electron-microscopy\">transmission electron microscopy</a>&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&#39;s strain-channelling equation, is proposed to elucidate the physical origin of such complex contrast phenomena.</p>", 
  "license": "https://creativecommons.org/licenses/by/4.0/legalcode", 
  "creator": [
    {
      "affiliation": "EPFL", 
      "@type": "Person", 
      "name": "Oveisi, E"
    }, 
    {
      "affiliation": "EPFL", 
      "@type": "Person", 
      "name": "Spadaro, M.C."
    }, 
    {
      "affiliation": "CNR", 
      "@type": "Person", 
      "name": "Rotunno, Enzo"
    }, 
    {
      "affiliation": "CNR", 
      "@type": "Person", 
      "name": "Grillo, Vincenzo"
    }, 
    {
      "affiliation": "EPFL", 
      "@type": "Person", 
      "name": "H\u00e9bert, C"
    }
  ], 
  "headline": "Insights into image contrast from dislocations in ADF-STEM", 
  "image": "https://zenodo.org/static/img/logos/zenodo-gradient-round.svg", 
  "datePublished": "2020-05-20", 
  "url": "https://zenodo.org/record/3836149", 
  "@context": "https://schema.org/", 
  "identifier": "https://doi.org/10.1016/j.ultramic.2019.02.004", 
  "@id": "https://doi.org/10.1016/j.ultramic.2019.02.004", 
  "@type": "ScholarlyArticle", 
  "name": "Insights into image contrast from dislocations in ADF-STEM"
}
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