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

Claim 0:
1. A power semiconductor device comprising:
a semiconductor layer of silicon carbide (SiC);
at least one trench extending in one direction and recessed into the semiconductor layer from a surface of the semiconductor layer;
a gate insulating layer disposed on at least an inner wall of the at least one trench;
at least one gate electrode layer disposed on the gate insulating layer and disposed in the at least one trench;
a drift region disposed in the semiconductor layer at least on one side of the at least one gate electrode layer and having a first conductivity type;
a well region disposed in the semiconductor layer to be deeper than the at least one gate electrode layer, so as to be in contact with at least a part of the drift region and to surround a bottom surface of the at least one gate electrode layer at least at one end of the at least one gate electrode layer, and having a second conductivity type;
a source region disposed in the well region and having the first conductivity type; and
at least one channel region disposed in the semiconductor layer of one side of the at least one gate electrode layer between the drift region and the source region, and having the second conductivity type,
wherein the drift region includes a vertical portion vertically extending in the semiconductor layer of the one side of the at least one gate electrode layer,
wherein the at least one channel region is disposed in the semiconductor layer between the vertical portion of the drift region and the source region, and
wherein the well region, the source region, and the channel region are disposed in the semiconductor layer so as to be located on opposite sides of the vertical portion of the drift region.