Patent ID: 11908904
Assignee: INFINEON TECHNOLOGIES AUSTRIA AG
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A semiconductor device, comprising:
a semiconductor substrate having a first main surface and a second main surface opposite the first main surface;
a plurality of transistor cells, each transistor cell comprising a source region of a first conductivity type, a drift zone of the first conductivity type, a body region of a second conductivity type separating the source region from the drift zone, a field plate trench extending into the drift zone and including a field plate, and a planar gate on the first main surface and configured to control current through a channel of the body region;
a drain region of the first conductivity type at the second main surface; and
a diffusion barrier structure extending along the channel of the body region, the diffusion barrier structure comprising alternating layers of Si and oxygen-doped Si and a Si capping layer on the alternating layers of Si and oxygen-doped Si.