Shigeo Ohira
Tohoku University
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Publication
Featured researches published by Shigeo Ohira.
Applied Physics Express | 2008
Takayoshi Oshima; Takeya Okuno; Naoki Arai; Norihito Suzuki; Shigeo Ohira; Shizuo Fujita
A vertical-type Schottky photodetector based on a (100)-oriented β-Ga2O3 substrate has been fabricated with simple processes of thermal annealing and vacuum evaporation. The photodetector exhibited a rectification ratio higher than 106 at ±3 V, and showed deep-ultraviolet-light detection at reverse bias. The spectral response showed solar-blind sensitivity with high photoresponsivities of 2.6–8.7 A/W at wavelengths of 200–260 nm. These values were 35–150 times higher than those derived assuming the internal quantum efficiency to be unity. This fact is attributed to the carrier multiplication occurring in the highly resistive surface region that is subject to a high internal electric field of about 1.0 MV/cm at the reverse bias of 10 V.
Physica Status Solidi (c) | 2007
N. Suzuki; Shigeo Ohira; Miyoko Tanaka; Takamasa Sugawara; Kazuo Nakajima; T. Shishido
Thin Solid Films | 2008
Takayoshi Oshima; Naoki Arai; Norihito Suzuki; Shigeo Ohira; Shizuo Fujita
Thin Solid Films | 2008
Shigeo Ohira; Norihito Suzuki; Naoki Arai; Masahiko Tanaka; Takamasa Sugawara; Kazuo Nakajima; Toetsu Shishido
Thin Solid Films | 2006
Shigeo Ohira; Masayuki Yoshioka; Takamasa Sugawara; Kazuo Nakajima; Toetsu Shishido
Physica Status Solidi (c) | 2008
Shigeo Ohira; Naoki Arai
Physica Status Solidi (c) | 2007
Shigeo Ohira; Noriji Suzuki; H. Minami; K. Takahashi; Tsutomu Araki; Yasushi Nanishi
Journal of Alloys and Compounds | 2005
Shigeo Ohira; Takamasa Sugawara; Kazuo Nakajima; Toetsu Shishido
Archive | 2007
Naoki Arai; Shizuo Fujita; Shigeo Ohira; Takahito Oshima; 孝仁 大島; 重男 大平; 直樹 新井; 静雄 藤田
Applied Surface Science | 2008
Shigeo Ohira; Naoki Arai; Takayoshi Oshima; Shizuo Fujita
