Patent ID: 9318375
Filing Date: 2016-04-19
CPC Classification: H01L

Claim Text:
1. A structure, comprising: a substrate; a dielectric etch stop layer in direct physical contact with a top surface of said substrate; a dielectric layer in direct physical contact with a top surface of said dielectric etch stop layer; a dielectric profile modulation layer in direct physical contact with a top surface of said dielectric layer, said dielectric layer between said dielectric etch stop layer and said dielectric profile modulation layer; an additional dielectric layer in direct physical contact with a top surface of said dielectric profile modulation layer; wherein said dielectric etch stop layer and said dielectric profile modulation layer each independently have respective thicknesses at least five times less than either a thickness of said dielectric layer or a thickness of said additional dielectric layer; and wherein a total thickness of said dielectric etch stop layer, said dielectric layer, said dielectric profile modulation layer and said additional dielectric layer is greater than or equal to about 1 micron; an opening having an upper region and an abutting lower region, said upper region extending from a top surface of said additional dielectric layer to said top surface of said profile modulation layer, said lower region extending from said top surface of said dielectric profile modulation layer to said top surface of said substrate; a first width of said opening measured in first direction parallel to said top surface of said dielectric layer at said top surface of said additional dielectric layer is greater than a second width of said opening measured in said first direction at said top surface of said profile modulation layer and greater than a third width of said opening measured in said first direction at said top surface of said substrate, said second width greater than or equal to said third width; a ratio of a depth of said opening measured in a second direction perpendicular to said first direction from said top surface of said additional dielectric layer to said top surface of said substrate to said third width is equal to or greater than five; and an electrical conductor completely filling said opening.