Patent ID: 11908928
Assignee: INFINEON TECHNOLOGIES AUSTRIA AG
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. A semiconductor device, comprising:
a semiconductor substrate;
a gate trench extending from a first main surface of the semiconductor substrate into the semiconductor substrate;
a field plate trench extending from the first main surface into the semiconductor substrate and laterally spaced apart from the gate trench, the field plate trench having one or more sidewalls and a bottom;
a field plate in the field plate trench;
an air gap separating the field plate from the one or more sidewalls and the bottom of the field plate trench;
a space in a central part of the field plate; and
an electrically insulative material occupying the space in the central part of the field plate and anchoring the field plate to the semiconductor substrate by spanning the air gap at the bottom of the field plate trench.