Dr. Kohei K. Shima Profile

Dr. Kohei K. Shima

at Tohoku Univ

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Author

Publications (4)

Proceedings Article | 13 March 2024 Presentation

Operation-induced short-term degradation mechanisms of 275-nm-band AlGaN-based deep-ultraviolet light-emitting diodes on a sapphire substrate

Shigefusa Chichibu, Koji Okuno, Masaki Oya, Yoshiki Saito, Hisanori Ishiguro, Tetsuya Takeuchi, Kohei Shima

Proceedings Volume PC12906, PC129060C (2024) https://doi.org/10.1117/12.3000963

KEYWORDS: Sapphire, Light emitting diodes, Deep ultraviolet, Polonium, Internal quantum efficiency, Quantum wells, Quantum operations, Quantum efficiency, Photoluminescence, Nitrogen

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Proceedings Article | 9 March 2024 Presentation

Low-pressure acidic ammonothermal (LPAAT) growth of large diameter nearly bowing-free GaN crystals

Shigefusa Chichibu, Kouhei Kurimoto, Quanxi Bao, Yutaka Mikawa, Makoto Saito, Daisuke Tomida, Tohru Ishiguro, Kohei Shima

Proceedings Volume PC12886, PC1288601 (2024) https://doi.org/10.1117/12.3001028

KEYWORDS: Gallium nitride, Crystals, Semiconducting wafers, Physical coherence, Manufacturing, Gallium, Electronic components, Chip manufacturing

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Proceedings Article | 21 March 2023 Presentation

Impacts of vacancy clusters on the recombination dynamics in Mg-implanted GaN on GaN structures

Shigefusa Chichibu, Kohei Shima, Hiroko Iguchi, Tetsuo Narita, Keita Kataoka, Hideki Sakurai, Michal Bockowski, Jun Suda, Tetsu Kachi, Shinya Takashima, Ryo Tanaka, Katsunori Ueno, Masaharu Edo, Shoji Ishibashi, Akira Uedono

Proceedings Volume PC12421, (2023) https://doi.org/10.1117/12.2646375

KEYWORDS: Gallium nitride, Luminescence, Ultraviolet radiation, Magnesium, Gallium, Doping, Annealing

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Proceedings Article | 16 February 2020 Paper

Origin and dynamic properties of major intrinsic nonradiative recombination centers in wide bandgap nitride semiconductors

Shigefusa Chichibu, Kohei Shima, Kazunobu Kojima, Shoji Ishibashi, Akira Uedono

Proceedings Volume 11280, 112800B (2020) https://doi.org/10.1117/12.2545409

KEYWORDS: Gallium nitride, Semiconductors, Aluminum nitride, Magnesium, Doppler effect, Luminescence, Light emitting diodes

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