Patent ID: 7859113
Filing Date: 2010-12-28
Classification: H01L

Abstract:
1. A structure comprising: a metal wire having a liner-less interface; a dielectric layer located above the liner-less interface of the metal wire; a via extending upwardly from the metal wire through the dielectric layer; a refractory metal collar extending from a side of the via and partially along the liner-less interface, the refractory metal collar having a slit-shaped cross section with a substantially uniform thickness extending downward from the liner-less interface and a substantially uniform width extending radially outward from the side of the via along the liner-less interface, wherein the substantially uniform thickness of the slit-shaped cross section is less than the substantially uniform width of the slit-shaped cross section; and a first liner that is continuous about the via including the bottom of the via and the refractory metal collar, wherein the first liner is provided against an internal wall surface of the via including the bottom of the via, wherein a portion of the internal wall surface of the via is the surface of the dielectric layer, wherein the first liner runs continuously against the internal wall surface of the via as the via extends through the dielectric layer and the metal wire, wherein the first liner includes a second refractory metal that is the same as the refractory metal used in the refractory metal collar.