Patent ID: 9443972
Filing Date: 2016-09-13
CPC Classification: H01L

Claim Text:
1. A method of producing a semiconductor device, the method comprising: providing a semiconductor body having a first surface and a dielectric layer arranged on the first surface; forming at least one first trench in the dielectric layer, the at least one first trench extending to the semiconductor body and defining a dielectric mesa region in the dielectric layer; forming a second trench in the dielectric layer, distant to the at least one first trench, leaving portions of the dielectric layer immediately adjacent the second trench in the dielectric mesa region, wherein the second trench is formed such that a bottom of the second trench is arranged within the dielectric layer; forming a semiconductor layer in the at least one first trench, on regions of the semiconductor body that are not covered by the dielectric layer in the at least one first trench; and forming a field electrode in the second trench.