Patent ID: 8629493

Claim:
A semiconductor device comprising a p-type semiconductor layer, the p-type semiconductor layer having formed thereon: a first n-type semiconductor region, wherein the first n-type semiconductor region is characterized by a first thickness; a first trench having a predetermined depth and extending into the first n-type semiconductor region, thereby defining a first interfacial region disposed between the first n-type semiconductor region and the first trench, wherein the first trench comprises: a first dielectric material disposed in a proximal portion of the first trench and distal portion of the first trench, wherein an intentionally introduced charge is present in at least one of the first dielectric material disposed in the proximal portion of the first trench or the first interfacial region; and a first gate material disposed interior to the first dielectric material in the proximal portion of the first trench; and a second p-type semiconductor region, wherein the second p-type semiconductor region is characterized by a second thickness; a second trench having a second predetermined depth and extending into the second p-type semiconductor region, thereby defining a second interfacial region disposed between the second p-type semiconductor region and the second trench, wherein the second trench comprises: a second dielectric material disposed in a proximal portion of the second trench and distal portion of the second trench, wherein an intentionally introduced charge is provided in at least one of the second dielectric material disposed in the proximal portion of the second trench or the second interfacial region; and a second gate material disposed interior to the second dielectric material in the proximal portion of the second trench; wherein the first dielectric material disposed in the distal portion of the first trench and the second dielectric material disposed in the distal portion of the second trench further comprises a third dielectric material disposed interior to the first dielectric material and the second dielectric material.