Patent ID: 7952189

Claim:
A wafer-level cavity packaging, comprising: An enclosure on a substrate wafer, with bondpads on the outside of said enclosure, comprising a top cover formed from a cap wafer; a polymer adhesive ring; a bottom formed from said substrate wafer; and a deposited diffusion barrier layer formed from a metal or a ceramic; wherein said polymer adhesive ring serves as a spacer, an adhesive, and part of the sidewall of said enclosure; wherein said adhesive ring bonds the top surface of said substrate to the bottom surface of said cap wafer; wherein substantially the entire outer vertical side surfaces of said enclosure including those of said cap wafer and adhesive ring are directly covered by said diffusion barrier; wherein said diffusion barrier forms and/or covers a stair outside of said enclosure, wherein the stair comprises at least three stair steps of which a top step is formed from a top edge of said cap wafer, a middle step is formed directly on an outer edge of said polymer adhesive ring, and a lower step is formed from an outer edge of said diffusion barrier directly on a top surface of said substrate wafer; wherein said bondpads and the outer vertical side surfaces or edges of said substrate are not covered by said diffusion barrier.