Patent ID: 9589895
Date: 2017-03-07
CPC Classifications: H01L

Claim:
1. An edge seal structure encircling a product region and located at a perimeter of a wafer, the edge seal structure comprising: a permeable layer on a product area of the wafer, wherein an outer edge of the permeable layer is spaced a first distance from an outer edge of the wafer; a lower metal fillet on the wafer laterally adjacent to an in contact with the permeable layer, wherein an outer edge of the lower metal fillet is spaced a second distance from the outer edge of the wafer, wherein the second distance is smaller than the first distance; a non-permeable dielectric layer on the permeable layer, on the lower metal fillet, and on an outer region of the wafer adjacent to the lower metal fillet, wherein an outer edge of the dielectric layer is spaced a third distance from the outer edge of the wafer, and wherein the third distance is smaller than the second distance; an upper metal fillet on the dielectric layer, wherein an outer edge of the upper metal fillet is vertically aligned with an outer edge of the lower metal fillet such that the outer edge the upper metal fillet is the second distance from the outer edge of the wafer; and a capping layer on the dielectric layer and the upper metal fillet, wherein the capping layer has an outer edge that is vertically aligned with the outer edge of the dielectric layer such that the outer edge of the capping layer is the third distance from the outer edge of the wafer.