Patent ID: 9299819
Filing Date: 2016-03-29
CPC Classification: H01L

Claim Text:
1. An insulated-gate bipolar transistor (IGBT) in a semiconductor substrate, said IGBT comprising: a collector at a bottom surface of said semiconductor substrate, a drift region having a first conductivity type situated over said collector, and a base layer having a second conductivity type opposite said first conductivity type situated over said drift region; a plurality of deep insulated trenches extending from a semiconductor surface above said base layer to a depth of greater than six micrometers (6.0 μm) to terminate in said drift region; each of said deep insulated trenches having a buried depletion electrode and at least one gate electrode disposed therein; said buried depletion electrode reaching deeper into said deep insulated trench than said at least one gate electrode; an active cell including an emitter adjacent said at least one gate electrode, and an implant zone, situated between adjacent deep insulated trenches; said implant zone being formed below said base layer and having said first conductivity type.