Patent ID: 8287956
Filing Date: 2012-10-16
Classification: C23C,H01L

Abstract:
1. A method of sealing a chamber of an electromechanical device having a mechanical structure overlying a substrate, wherein the mechanical structure is in the chamber, the method comprising: (a) iterating the following multiple times to form a sacrificial oxide layer: (b) depositing a first encapsulation layer over the sacrificial oxide layer; (c) forming at least one vent through the first encapsulation layer to allow removal of at least a portion of the sacrificial oxide layer; (d) removing at least a portion of the sacrificial oxide layer to form the chamber; and (e) depositing a second encapsulation layer over or in the vent to seal the chamber, wherein the second encapsulation layer is a semiconductor material; wherein each sub-layer of the sacrificial oxide layer is formed with a compressive stress.