Patent ID: 11961903
Assignee: HYUNDAI MOBIS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A power semiconductor device comprising:
a semiconductor layer of silicon carbide (SiC);
a plurality of trenches extending in parallel in one direction and recessed into the semiconductor layer from a surface of the semiconductor layer;
a gate insulating layer disposed on at least inner walls of the trenches;
a gate electrode layer disposed on the gate insulating layer and including a plurality of portions respectively disposed in the plurality of trenches;
a drift region including a plurality of vertical portions disposed in the semiconductor layer between the plurality of portions of the gate electrode layer, and having a first conductivity type;
a well region disposed in the semiconductor layer to be deeper than the plurality of portions of the gate electrode layer, so as to be in contact with the plurality of vertical portions of the drift region and to surround bottom surfaces of the plurality of portions of the gate electrode layer at opposite ends of the plurality of portions of the gate electrode layer, and having a second conductivity type;
a source region disposed in the well region and having the first conductivity type; and
a plurality of channel regions disposed in the semiconductor layer of opposite sides of the plurality of portions of the gate electrode layer between the plurality of vertical portions of the drift region and the source region, and having the second conductivity type,
wherein the gate electrode layer continuously extends from one of the plurality of trenches to another of the plurality of trenches so as to continuously cover an upper surface of the source region between the one of the plurality of trenches and the another of the plurality of trenches.