Patent ID: 8580596

Claim:
A method of forming one or more micro cavities, each micro cavity comprising a micro electrical mechanical system (MEMS), in a process further forming at least one semiconductor component in parallel with the micro cavity and having process steps in common, comprising: releasing the micro cavity after the formation of the at least one semiconductor component is finished; providing a plurality of release openings through a backside of a substrate at the micro cavity, wherein a total area of the release openings through the backside of the substrate at the micro cavity is about 50% or less of the corresponding area of the micro cavity, and a density of the release openings is about 0.25 or less per μm 2 ; and depositing a hermetic sealing layer on the backside of the substrate to seal the micro cavity formed by etching, wherein at least part of the hermetic sealing layer is deposited by sputtering metal on the backside of the substrate, wherein the hermetic sealing layer is in physical contact with the entire backside of the substrate, and wherein sidewalls of the openings are essentially free of the hermetic sealing layer.