| 研究課題/領域番号 |
22K14143
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| 研究機関 | 大阪大学 |
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研究代表者 |
LI YAN 大阪大学, 大学院基礎工学研究科, 助教 (70930171)
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| 研究期間 (年度) |
2022-04-01 – 2024-03-31
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| キーワード | Photoindentation / compound semiconductors / oxides / crystal plasticity / dislocations |
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| 研究実績の概要 |
This project aims to elucidate how light affects the mechanical properties of wurtzite semiconductors. Many advanced semiconductor compounds, such as GaN and ZnO, possess wurtzite structure, which consists of two individual hexagonal close-packed sublattices. In FY2022, our studies mainly focused on wurtzite ZnO, a representative third-generation semiconductor material. Photoindentation technique, i.e., in-situ nanoindentation experiments with a controllable light illumination system, was adopted to evaluate the mechanical responses at the nanoscale under different light conditions. Three types of photoindentation experiments were applied on two ZnO single crystals with different orientations. Low-load indentation pop-in tests were performed to investigate the light effects on dislocation nucleation. Middle-load quasi-indentation tests were conducted to verify the photo-hardening effects of different orientations. High-load indentation creep tests were carried out to study the influence of light on dislocation multiplication and motion along different slip planes. It was found that light only shows a slight influence on the dislocation nucleation event, but significantly affects dislocation motion.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
So far, we have studied the influence of light on different slip system in wurtzite ZnO single crystals at the nanoscale using photoindentation technique. Related results have been published in journals and reported at domestic and international conferences. Therefore, we think the project is progressing rather smoothly.
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| 今後の研究の推進方策 |
In FY2023, we will continue to evaluate the effects of light on different slip systems in wurtzite semiconductors. Transmission electron microscopy will be adopted to visualize the light influence on dislocation behaviors. Meanwhile, we will prepare papers on the research results of FY2022, and submit them in mid FY2023.
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| 次年度使用額が生じた理由 |
In the next fiscal year, we need to buy new wurtzite single crystal samples for the follow-up research. A new indenter that could be used under ultra-violet light is also required. In addition, the PI plan to attend 2 domestic conferences and 1 international conference.
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