Patent ID: 8188567

Claim:
A semiconductor device, comprising: a semiconductor substrate comprising a first substrate surface and at least one trench comprising at least one trench surface, the trench extending from the first substrate surface into the semiconductor substrate, in a longitudinal direction and comprising a first trench section and a second trench section which is arranged adjacent, in the longitudinal direction, to the first trench section; a first insulating layer covering the trench surface in a lower portion of the first and second trench sections; a second insulating layer covering the trench surface in an upper portion of the first and second trench sections, the second insulating layer being thinner than the first insulating layer; a conductor region on the second insulating layer in the second trench section, the conductor region extending from an upper surface or edge of the first insulating layer at least to the first substrate surface; and a third insulating layer on the second insulating layer in the first trench section, the third insulating layer extending from an upper surface or edge of the first insulating layer at least to the first substrate surface.