Nucleation of threading dislocations in atomistic simulations of strained layer epitaxy of III-nitrides

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F24%3A00579395" target="_blank" >RIV/68081723:_____/24:00579395 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S1359645423008996?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1359645423008996?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.actamat.2023.119570" target="_blank" >10.1016/j.actamat.2023.119570</a>

Result language
angličtina
Original language name
Nucleation of threading dislocations in atomistic simulations of strained layer epitaxy of III-nitrides
Original language description
The early stage of heteroepitaxial growth of wurtzite III-nitrides on lattice-mismatched substrates producesnepitaxial strain that is relieved by nucleating a network of misfit dislocations. However, these epilayers containnalso a large density of threading dislocations that are nearly perpendicular to the interface, despite the factnthat they do not relieve the epitaxial strain. To shed light onto the mechanism of nucleation of threadingndislocations, we employ atomistic simulations to explore the heteroepitaxy between a GaN nanoisland and anrigid substrate whose lattice parameter is adjusted to produce the desired misfit. We observe that the ends ofnmisfit dislocations experience large image forces that pull them toward the pyramidal facets of the nanoisland.nThis results in bending of the terminating ends of misfit dislocations which constitute segments of threadingndislocations. The spacing of these threading dislocations would increase (and thus their density decrease) ifnthe epitaxial growth could be manipulated such that the film was deposited in a layer-by-layer fashion.n
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
<a href="/en/project/FW01010183" target="_blank" >FW01010183: Next Generation of Integrated Atomic Force and Scanning Electron Microscopy</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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