Patent ID: 8546243

Claim:
A method, comprising: forming a first trench and a second trench in a substrate; forming a first insulator layer within the first trench and the second trench; forming a first electrode material within the first trench and the second trench, on the first insulator layer, and isolated from the substrate by the first insulator layer; forming a second insulator layer within the first trench and the second trench and on the first electrode material; forming a second electrode material within the first trench and the second trench, on the second insulator layer, and isolated from the substrate by the first insulator layer and the second insulator layer, the second electrode material pinching off the second trench; removing a portion of the second electrode material and the second insulator layer at a bottom portion of the first trench; and filling in the first trench with additional second electrode material such that the additional second electrode material is in electrical contact with the second electrode material and the first electrode material.