Patent ID: 9324829
Filing Date: 2016-04-26
CPC Classification: H01L

Claim Text:
1. A method for producing a semiconductor device, the method comprising: forming a trench extending from a first surface of a semiconductor body into the semiconductor body such that the trench has a first trench section and at least one second trench section adjoining the first trench section; forming, in the at least one second trench section, a first electrode dielectrically insulated from first semiconductor regions of the semiconductor body by a first dielectric layer; forming, in the at least one second trench section, an inter-electrode dielectric layer on the first electrode; and forming, in the at least one second trench section on the inter-electrode dielectric layer, and in the first trench section, a second electrode, such that the second electrode at least in the first trench section is dielectrically insulated from second semiconductor regions of the semiconductor body by a second dielectric layer, wherein the first trench section is wider than the at least one second trench section in plan view of the semiconductor body that is parallel with the first surface, and wherein the trench comprises tapered sidewalls connecting two substantially parallel sidewalls of the first trench section to two substantially parallel sidewalls of the at least one second trench section in the plan view.