Patent ID: 7420258

Claim:
A semiconductor device comprising: a substrate having a major surface and a feature to be contacted; a first trench formed in the substrate and extending from the major surface, the first trench having a first blocking layer formed on exposed surfaces of the first trench, and a first conductive material formed over the first blocking layer, wherein the first conductive material contacts the feature through an opening in the first blocking layer; a second trench formed in the substrate and extending from the major surface, the second trench having a second blocking layer formed on exposed surfaces of the second trench, and a second conductive material formed over the second blocking layer, wherein the second conductive material contacts the substrate through an opening in the second blocking layer; a third trench formed in the substrate and extending from the major surface, the third trench having a third blocking layer formed on exposed surfaces of the third trench, and a third conductive material formed over the third blocking layer, wherein the third conductive material contacts the feature through an opening in the third blocking layer, and wherein the third trench is isolated at the major surface.