Structural Transformations of the Dislocation Cores in Si and Their Relationship with Photoluminescence
As a result of in situ irradiation in a high-resolution electron microscope, structure modelling, and calculation of images, it is shown that the incorporation of self-interstitial atoms into the extension region of the core of any dislocation is accompanied by their ordering in the form of cluster-...
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Published in | Crystallography reports Vol. 66; no. 4; pp. 636 - 643 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Moscow
Pleiades Publishing
01.07.2021
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | As a result of in situ irradiation in a high-resolution electron microscope, structure modelling, and calculation of images, it is shown that the incorporation of self-interstitial atoms into the extension region of the core of any dislocation is accompanied by their ordering in the form of cluster-like {111}, {001}, and {113} defects, which provide core relaxation. This fact made it possible to visualize for the first time the core structure of undissociated 60° dislocations of two types, glide (
) and sessile (
), which coexist at plastic deformation of Si. It is shown that incorporation of self-interstitial atoms into the dislocation core correlates with an increase of only the
D
2 line in the photoluminescence spectrum, while perfect sessile
a
/2〈110〉 dislocations with a core, consisting of paired 5/7-link atomic rings without dangling bonds, are responsible for the rise of the
D
1 line. This universal core occurs at coalescence of two
dislocations during their slip in intersecting planes {111},
→
transition, and transformation of a Frank dislocation into a perfect one. |
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ISSN: | 1063-7745 1562-689X |
DOI: | 10.1134/S1063774521040064 |