Patent ID: 9728614
Date: 2017-08-08
CPC Classifications: H01L

Claim:
1. A method of manufacturing a semiconductor device, the method comprising: forming a gate electrode adjacent to a body region in a semiconductor substrate; forming a field plate trench in a main surface of the semiconductor substrate, the field plate trench having an extension length in a first direction parallel to the main surface; and forming a field electrode in the field plate trench so that the field electrode is insulated from an adjacent drift zone by a field dielectric layer, wherein the extension length of the field plate trench in the first direction is less than double an extension length of the field electrode in a second direction that is perpendicular to the first direction and parallel to the main surface, wherein the extension length in the first direction is more than half the extension length in the second direction, wherein a field plate material of the field electrode has a resistivity in a range from 10