| 研究課題/領域番号 |
22K20438
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| 研究機関 | 豊田工業大学 |
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研究代表者 |
VILLAMIN MARIAEMMA 豊田工業大学, 工学(系)研究科(研究院), ポストドクトラル研究員 (00960874)
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| 研究期間 (年度) |
2022-08-31 – 2025-03-31
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| キーワード | GaN / Laser activation / excimer laser / ArF activation annealing / Mg doped GaN |
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| 研究実績の概要 |
Main goal is to realize GaN SJ device with p-GaN region selectively activated via ArF laser. This will be an original proof of concept for SJ structure fabrication that is difficult to make due to alternating p-&n- layers needed. ArF laser activation of Mg-doped GaN device was investigated. We have achieved laser activation resistivity comparable to thermally activated Mg-doped GaN, which suggest feasibility of laser activation. Our results reveal some insights on the fundamental activation mechanism of laser annealing, that is probable thermal mechanism is responsible for acceptor laser activation. Also, it is still a challenged to achieve good ohmic contact for p-GaN device.So, we also studied Indium as low temperature annealed contact& achieved low contact resistance with In/Au metal
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
3: やや遅れている
理由
We have presented laser activation annealing of an Mg-doped GaN four-point probe small mesa device using ArF excimer laser in SPIE photonics west 2024 (international conference). And just submitted a paper in a journal.
We have also presented some results to domestic conferences and international conference within japan. We also bought the co-doped GaN wafers last year. However, the Gallium export restrictions from Chinese government result to longer delivery lead time. Currently, I am still waiting for the delivery of the co-doped wafer and continuously talking with Enkris about the possible delivery date. This delay on wafer delivery is the only reason for the slightly delayed status.
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| 今後の研究の推進方策 |
While waiting for the co-doped wafer delivery, we are continuously improving the laser activation annealing setup. That is, different program of the programmable laser scanning stage will be investigated in preparation for the fabrication of GaN SJ device. Moreover, if the co-doped wafers will be received, we plan to immediately do laser activation on a small area device and then, scan a bigger area using laser scanning. And if possible, do fabrication of the device.
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| 次年度使用額が生じた理由 |
We bought the third batch of co-doped GaN wafers last year. However, the Gallium export restrictions from Chinese government result to longer delivery lead time. Before the restriction, it took only 1 month for the delivery of the ordered wafers, but now it is indefinite. Currently, I am still waiting for the export license approval, thus wafers are not yet delivered.
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