Patent ID: 8889532

Claim:
A method for forming a semiconductor device comprising the steps of: providing a region of semiconductor material having a major surface; forming a trench extending from the major surface; forming a first layer overlying surfaces of the trench; forming a spacer layer adjacent the first layer, where the spacer layer comprises a material different than the first layer, where the spacer layer is discontinuous in proximity to a lower surface of the trench; forming a first region comprising a material different than the spacer layer in proximity to the lower surface of the trench; forming a first electrode in a lower portion of the trench and adjacent portions of the spacer layer and the first region, where portions of the first layer are between the first electrode and the region of semiconductor material; forming a dielectric layer above the first electrode; and forming a second electrode adjacent the first layer and the dielectric layer, where at least a portion of the second electrode is within the trench.