Tomoaki Sumi

Pressure-Dependent Raman Scattering Spectrum of Piezoelectric (Li,Na,K)NbO₃ Lead-Free Ceramics

Ken‐ichi Kakimoto, Tomoaki Sumi, Isao Kagomiya · Japanese Journal of Applied Physics · 2010 · 38 citations

Natural Sciences, Materials Science, Physics +15

Development of a 2-inch GaN wafer by using the oxide vapor phase epitaxy method

Junichi Takino, Tomoaki Sumi, Yoshio Okayama et al. · Japanese Journal of Applied Physics · 2019 · 38 citations

Engineering, Materials Engineering, Materials Science +17

Vapor-phase epitaxial growth of GaN films using Ga2O vapor and NH3

Mamoru Imade, Yuan Bu, Tomoaki Sumi et al. · Journal of Crystal Growth · 2011 · 27 citations

Natural Sciences, Materials Engineering, Materials Science +15

Extreme reduction of on-resistance in vertical GaN p–n diodes by low dislocation density and high carrier concentration GaN wafers fabricated using oxide vapor phase epitaxy method

Junichi Takino, Tomoaki Sumi, Yoshio Okayama et al. · Applied Physics Express · 2020 · 27 citations · Full text

Engineering, Electrical Engineering, Materials Science +17

Floral design GaN crystals: low-resistive and low-dislocation-density growth by oxide vapor phase epitaxy

Junichi Takino, Tomoaki Sumi, Yoshio Okayama et al. · Japanese Journal of Applied Physics · 2021 · 14 citations · Full text

Engineering, Materials Engineering, Materials Science +16