Patent ID: 7906428
Filing Date: 2011-03-15
Classification: H01L

Abstract:
1. A method of forming an interconnect structure having a modified via bottom structure comprising: forming a second dielectric layer atop a first dielectric layer having a metallic interconnect embedded therein; forming at least one aperture within said second dielectric layer that extends to the metallic interconnect in said first dielectric layer; forming a liner material in said at least one aperture; forming an L-shaped liner by partially removing said liner material at a bottom surface of said at least one aperture and recessing an upper surface of the metal interconnect, wherein a remaining portion of said liner material is located on a portion of the upper surface of said metallic interconnect that is not recessed, wherein the remaining portion of the liner material and the upper surface of the metal interconnect that is recessed defines a kinked interface of said L-shaped liner within a bottom portion of said at least one aperture that protrudes from a sidewall of said at least one aperture, while simultaneously depositing a second liner on an upper surface of said L-shaped liner including atop said kinked interface and the upper surface of the metal interconnect that is recessed; and forming a conductive material in said at least one aperture including said kinked interface.