Active solid-state devices (e.g. – transistors – solid-state diode – Regenerative type switching device – Bidirectional rectifier with control electrode
Patent
1995-03-15
1997-03-04
Meier, Stephen
Active solid-state devices (e.g., transistors, solid-state diode
Regenerative type switching device
Bidirectional rectifier with control electrode
257122, H01L 2974, H01L 31111
Patent
active
056082363
ABSTRACT:
A semiconductor device includes an emitter region, a collector region provided directly under the emitter region, and a two-region base structure. The first base region is interposed between the emitter and collector regions, and the second base region supports the collector region. The aforementioned regions have a progressively higher impurity concentrations, with the collector region having an impurity concentration higher than that of the first base region, the second base region having an impurity concentration higher than that of the collector region, and the emitter region having an impurity concentration higher than that of the base region. Also included is a resistance region formed, in one embodiment, from a projecting end portion of one of the base layers. The projecting end portion of the base is fabricated so that both base portions contact one another in the resistance region, and consequently both base portions are of the same potential. Electrodes are also provided for ohmicly contacting the emitter, collector, and base regions. The two-region base structure enables the device to achieve a high resistance, and thus to achieve simultaneously a high breakdown voltage and a high frequency (speed) characteristic.
REFERENCES:
patent: 3631311 (1971-12-01), Engbert et al.
patent: 4231056 (1980-10-01), Taylor
patent: 4949153 (1990-08-01), Hirao et al.
patent: 4967246 (1990-10-01), Tanaka
patent: 5293051 (1994-03-01), Mariyama
Arakawa Hidetoshi
Inaba Masamitsu
Sugawara Yoshitaka
Hitachi , Ltd.
Hitachi Haramichi Electronics Co., Ltd.
Meier Stephen
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