Patent ID: 7879686

Claim:
A method for manufacturing a semiconductor device, comprising: providing 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 and running 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 trench surface being exposed in an upper portion of the first and second trench sections and being covered with a first insulating layer in a lower portion of the first and second trench sections; forming a second insulating layer at least on the exposed trench surface in the upper portion of the first and second trench sections; forming a conductive layer on the second insulating layer at least in the upper portion of the first and second trench sections, wherein the second insulating layer electrically insulates the conductive layer from the semiconductor substrate; removing the conductive layer in the first trench section without removing the conductive layer in the second trench section; and forming a third insulating layer at least in the first trench section.