Papers by Author: Toshiharu Makino

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Authors: Satoshi Tanimoto, Kenichi Ueoka, Takaya Fujita, Sawa Araki, Kazu Kojima, Toshiharu Makino, Satoshi Yamasaki
Abstract: A new rectifier, called SPND or SNPD (Schottky-PN or -NP junction diode) and inherently showing low on-resistance and unipolar operation, was experimentally demonstrated for the first time on 4H-SiC. It is structured with an n or a p region of very low doping that is sandwiched and completely depleted between a Schottky junction and a one-sided PN junction. Either electrons or holes, but not both, contribute to the current conduction process. Clear and sharp rectifying properties are observed over the entire range of applied voltage.
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Authors: Satoshi Tanimoto, Tatsuhiro Suzuki, Sawa Araki, Toshiharu Makino, Hiromitsu Kato, Masahiko Ogura, Satoshi Yamasaki
Abstract: The long-term reliability of Schottky pn diodes (SPNDs) on diamond having widely used Ti/Pt/Au electrodes was investigated at 500°C in order to identify degradation phenomena at higher temperatures. A vital degradation event was observed after the passage of about 100 hours in that both forward and reverse currents were progressively reduced. AES depth profiling and X-STEM-EELS analyses revealed that this occurred because the Ti contact material changed to insulating (or semiconductive) TiO2, causing large series resistance.
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