Prof. Yoshinao Kumagai Profile

Prof. Yoshinao Kumagai

at Tokyo Univ of Agriculture and Technology

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Publications (6)

Proceedings Article | 1 November 2021 Paper

Terahertz time-domain spectroscopy of wide-bandgap semiconductors GaN and β-Ga2O3

Verdad Agulto, Toshiyuki Iwamoto, Kazuhiro Toya, Valynn Katrine Mag-usara, Masayuki Imanishi, Ken Goto, Hisashi Murakami, Yoshinao Kumagai, Yusuke Mori, Masashi Yoshimura, Makoto Nakajima

Proceedings Volume 12057, 120574M (2021) https://doi.org/10.1117/12.2606988

KEYWORDS: Terahertz radiation, Gallium nitride, Semiconducting wafers, Refractive index, Semiconductors, Terahertz spectroscopy, Ellipsometry

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Proceedings Article | 5 March 2021 Presentation

High-temperature growth of high-purity AlN layers on AlN substrates by HVPE

Nao Takekawa, Ken Goto, Toru Nagashima, Reo Yamamoto, Junji Kotani, Yoshinao Kumagai

Proceedings Volume 11686, 116861F (2021) https://doi.org/10.1117/12.2577988

KEYWORDS: Aluminum nitride, Silicon, Quartz, Crystals, Temperature metrology, Semiconductors, Manufacturing, Glasses, Aluminum

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Proceedings Article | 5 March 2021 Presentation

Mass production of AlN substrates by high speed homoepitaxial growth

Yoshinao Kumagai, Nao Takekawa, Ken Goto, Toru Nagashima, Reo Yamamoto, Junji Kotani

Proceedings Volume 11706, 117060M (2021) https://doi.org/10.1117/12.2577987

KEYWORDS: Aluminum nitride, Deep ultraviolet, Transparency, Viruses, Vapor phase epitaxy, Solid state electronics, Reliability, Optical components, Metals

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Proceedings Article | 10 March 2020 Presentation

Current status of halide vapor phase epitaxy of Ga2O3 and related sesquioxides (Conference Presentation)

Ken Goto, Nao Takekawa, Hisashi Murakami, Akito Kuramata, Shigenobu Yamakoshi, Bo Monemar, Masataka Higashiwaki, Yoshinao Kumagai

Proceedings Volume 11281, 112810E (2020) https://doi.org/10.1117/12.2551598

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Proceedings Article | 5 March 2020 Paper

Charge trapping and degradation of Ga2O3 isolation structures for power electronics

C. De Santi, A. Nardo, M. H. Wong, K. Goto, A. Kuramata, S. Yamakoshi, H. Murakami, Y. Kumagai, M. Higashiwaki, G. Meneghesso, E. Zanoni, M. Meneghini

Proceedings Volume 11281, 112810L (2020) https://doi.org/10.1117/12.2544818

KEYWORDS: Reliability

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Proceedings Article | 23 February 2018 Paper

Latest progress in gallium-oxide electronic devices

Masataka Higashiwaki, Man Hoi Wong, Keita Konishi, Yoshiaki Nakata, Chia-Hung Lin, Takafumi Kamimura, Lingaparthi Ravikiran, Kohei Sasaki, Ken Goto, Akinori Takeyama, Takahiro Makino, Takeshi Ohshima, Akito Kuramata, Shigenobu Yamakoshi, Hisashi Murakami, Yoshinao Kumagai

Proceedings Volume 10533, 105330O (2018) https://doi.org/10.1117/12.2292666

KEYWORDS: Gallium, Field effect transistors, Transistors, Diodes, Silicon, Gamma radiation, Electronic components, Oxides, Silicon carbide, Gallium nitride

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Showing 5 of 6 publications

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