Power semiconductor devices having discontinuous emitter regions

Active solid-state devices (e.g. – transistors – solid-state diode – Regenerative type switching device – Combined with field effect transistor

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257152, 257164, 257342, 257401, H01L 29745

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active

06111278&

ABSTRACT:
Power semiconductor devices having discontinuous emitter regions therein include a semiconductor substrate containing therein a collector region of second conductivity type, a buffer region of first conductivity type which forms a first P-N junction with the collector region and a drift region of first conductivity type which forms a non-rectifying junction with the buffer region. A base region of second conductivity type is also provided in the drift region and forms a second P-N junction therewith. In addition, a base contact region of second conductivity type is provided in the base region of second conductivity type. The base contact region typically has a much higher second conductivity type doping concentration therein than the base region. A preferred emitter region is also provided in the substrate. This preferred emitter region comprises an emitter contact region which is entirely surrounded in the substrate by the highly doped base contact region and a carrier emitting region. This emitter contact region may comprise the central portion of an S, H or C-shaped emitter or one side of an L-shaped emitter. An insulated gate electrode is also provided. The insulated gate electrode provides turn-on and turn-off control by enabling the formation of a highly conductive inversion-layer channel of first conductivity type in the base region. This inversion-layer channel electrically connects the carrier emitting region to the drift region. A first electrode is also electrically coupled to the base contact region and the emitter contact region, and a second electrode is electrically coupled to the collector region.

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