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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2503.19189 |
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| _version_ | 1866910014865670144 |
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| author | Li, Mingqiang Luo, Kun Ma, Xiumei Kumral, Boran Gao, Peng Filleter, Tobin An, Qi Zou, Yu |
| author_facet | Li, Mingqiang Luo, Kun Ma, Xiumei Kumral, Boran Gao, Peng Filleter, Tobin An, Qi Zou, Yu |
| contents | Photo-plasticity in semiconductors, wherein their mechanical properties such as strength, hardness and ductility are influenced by light exposure, has been reported for several decades. Although such phenomena have drawn significant attention for the manufacturability and usage of deformable semiconductor devices, their underlying mechanisms are not well understood due to the lack of direct evidence. Here we provide experimental observation and atomic insights into the reduced mobility of dislocations in zinc sulfide, as a model material, under light. Using photo-nanoindentation and transmission electron microscopy, we observe that dislocations glide shorter distances under light than those in darkness and there are no apparent deformation twins in both conditions. By atomic-scale simulations, we demonstrate that the decreased dislocation mobility is attributed to the increased Peierls stress for dislocation motion and enhanced stress fields around dislocation cores due to photoexcitation. This study improves the understanding of photo-plastic effects in inorganic semiconductors, offering the opportunities for modulating their mechanical properties using light. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_19189 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Direct evidence and atomic-scale mechanisms of reduced dislocation mobility in an inorganic semiconductor under illumination Li, Mingqiang Luo, Kun Ma, Xiumei Kumral, Boran Gao, Peng Filleter, Tobin An, Qi Zou, Yu Materials Science Computational Physics Photo-plasticity in semiconductors, wherein their mechanical properties such as strength, hardness and ductility are influenced by light exposure, has been reported for several decades. Although such phenomena have drawn significant attention for the manufacturability and usage of deformable semiconductor devices, their underlying mechanisms are not well understood due to the lack of direct evidence. Here we provide experimental observation and atomic insights into the reduced mobility of dislocations in zinc sulfide, as a model material, under light. Using photo-nanoindentation and transmission electron microscopy, we observe that dislocations glide shorter distances under light than those in darkness and there are no apparent deformation twins in both conditions. By atomic-scale simulations, we demonstrate that the decreased dislocation mobility is attributed to the increased Peierls stress for dislocation motion and enhanced stress fields around dislocation cores due to photoexcitation. This study improves the understanding of photo-plastic effects in inorganic semiconductors, offering the opportunities for modulating their mechanical properties using light. |
| title | Direct evidence and atomic-scale mechanisms of reduced dislocation mobility in an inorganic semiconductor under illumination |
| topic | Materials Science Computational Physics |
| url | https://arxiv.org/abs/2503.19189 |