About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Materials Processing and Kinetic Phenomena: From Thin Films and Micro/Nano Systems to Advanced Manufacturing
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Presentation Title |
Dislocation Formation in the Heteroepitaxial Growth of PbSe/PbTe Systems |
Author(s) |
Yang Li, Boyang Gu, Adrian Diaz, Simon Phillpot, David L. McDowell, Youping Chen |
On-Site Speaker (Planned) |
Yang Li |
Abstract Scope |
In this talk, we present a multiscale study on the heteroepitaxial growth of the PbSe/PbTe(111) and the PbTe/PbSe(001) systems using the Concurrent Atomistic-Continuum method as the simulation tool. Experimentally observed growth modes and dislocation networks are reproduced in the simulations. Nucleation of dislocations and formation of misfit dislocations in both systems have been visualized. Specifically, dislocation half-loops are observed to nucleate from the epilayer surfaces; these half-loops extend towards the interface by climb or glide motions, interact with other half-loops, and form misfit dislocations and threading dislocations. The dominant types of misfit dislocations in both systems are those with Burgers vectors parallel to the interfaces, whereas the misfit dislocations with Burgers vectors inclined to the interface have a low likelihood of generation and tend to annihilate. The size of the substrate has been demonstrated to significantly affect the formation and evolution of dislocations on the growth of PbSe on PbTe(111). |
Proceedings Inclusion? |
Planned: |
Keywords |
Thin Films and Interfaces, Modeling and Simulation, Computational Materials Science & Engineering |