Patent ID: 7652334

Claim:
A semiconductor structure, comprising: a semiconductor substrate, wherein said semiconductor substrate comprises a trench formed within a first portion of a first surface of said semiconductor substrate; a first layer of electrically insulative material formed within the trench, wherein the first layer consists of only a single recess; a second layer of electrically insulative material within the single recess; and a third layer of electrically insulative material over said second layer, wherein said third layer comprises a first portion extending laterally over and parallel to a second portion of said first surface of said semiconductor substrate and a second portion extending laterally over and parallel to a third portion of said first surface of said semiconductor substrate, wherein a bottom surface of said third layer is in contact with only said second layer and said first surface of said semiconductor substrate, wherein said first portion of said third layer comprises a first convex surface, and wherein said second portion of said third layer comprises a second convex surface.