Patent ID: 8753979
Filing Date: 2014-06-17
Classification: H01L

Abstract:
1. A method of forming an interconnect structure comprising: forming at least one opening in a dielectric material of unitary composition utilizing a patterned hard mask located on a surface of said dielectric material of unitary composition as a mask, wherein an undercut is present beneath said patterned hard mask; forming a dense dielectric spacer in said at least one opening and at-least partially on a first portion of exposed sidewalls of said dielectric material of unitary composition wherein an air gap remains in the undercut; forming a diffusion barrier within said at least one opening on at least said dense dielectric spacer, wherein a first surface of the diffusion barrier directly contacts a surface of the dense dielectric spacer and wherein a second surface of the diffusion barrier directly contacts a second portion of said exposed sidewalls of the dielectric material of unitary composition; and forming a conductive material within said at least one opening on said diffusion barrier.