Patent ID: 8114743

Claim:
A method of producing an integrated circuit device, comprising: forming a trench structure having trench walls in a semiconductor body for a cell field and an edge trench in an edge region; forming mesa structures for drift zones of a first conduction type in the cell field; applying an oxide layer forming a field plate isolation on the trench walls and a field oxide in the edge region of a front side of the semiconductor body; introducing field plate material into the trench structure and the edge trench; exposing upper regions of the trench walls in the cell field; applying a gate oxide to the exposed upper region of the trench walls; introducing a gate electrode material into the upper regions of the trench structure; and ion implantation of doping materials for a complementary conduction type accompanied by the formation of body zones on the mesa structures in the cell field and by the formation of an edge zone of a complementary conduction type with doping materials of the body zone below the field oxide in the edge region within and outside the edge trench.