Patent ID: 7317233

Claim:
A microelectromechanical device comprising: a substrate; an insulation layer disposed on the substrate; a first semiconductor layer disposed on or above the insulation layer; an anchor that is disposed in an opening in the insulation layer and the first semiconductor layer and contacts the substrate, wherein the anchor includes a material that is different from the insulation layer; a second semiconductor layer disposed on the anchor; a fixed electrode, formed, in part, from the first and second semiconductor layers, wherein the fixed electrode is affixed to the substrate via the anchor; a moveable electrode, formed, in part, from the second semiconductor layer, wherein the moveable electrode is disposed, at least in part, in a chamber; a first encapsulation layer disposed over the moveable electrode, wherein the first encapsulation layer is at least a portion of a wall of the chamber; and a second encapsulation layer, deposited on the first encapsulation layer, to seal the chamber.