| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Dislocation or Twinning Formation in Inorganic Semiconductors from Light Irradiation |
| Author(s) |
Yidi Shen, Hongwei Wang, Qi An |
| On-Site Speaker (Planned) |
Yidi Shen |
| Abstract Scope |
Inorganic semiconductors have widespread applications in electronic devices, but they suffer from the brittle failure because of their strong ionic and directional covalent bonding which suppress the mobile dislocations. Therefore, it is essential to improve their ductility for the extended engineering applications. Here, we employed quantum mechanics (QM) simulations to investigate how the photonic excitation affect the plastic deformation in sphalerite ZnS and related II-IV semiconductors. We found that in ZnS the dislocation dominated deformation mode transforms to a twin dominated deformation mode when the electron-hole pair are excited, leading to a brittle failure. While the dislocation dominated mechanism leads to a ductile mechanical behavior under the ground state. These simulation results agree very well with the recent mechanical experiments on single crystal ZnS in which the ductile ZnS under darkness becomes brittle with light illumination. Our results provide the theoretical basis to investigate the photon-mechanical behaviors of semiconductors. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |