Patent ID: 6936491

Claim:
A method of sealing a chamber of a microelectromechanical device having a micromechanical structure and a contact wherein the micromechanical structure is in a chamber, the method comprising: depositing a sacrificial layer over at least a portion of the micromechanical structure; depositing a first encapsulation layer over the sacrificial layer; forming at least one vent through the first encapsulation layer to allow removal of at least a portion of the sacrificial layer; removing at least a portion of the sacrificial layer to form the chamber; depositing a second encapsulation layer over or in the vent to seal the chamber wherein the second encapsulation layer is a semiconductor material; forming a trench around at least a portion of the contact which is disposed outside the chamber; and depositing an insulating material in the trench to electrically isolate the contact.