Patent ID: 7473636
Filing Date: 2009-01-06
Classification: H01L

Abstract:
1. A method of forming an interconnect member in an interlevel dielectric in the back end of the line portion of an integrated circuit comprising the steps of: forming an aperture extending along an interconnect axis in said interlevel dielectric, said aperture having a bottom surface, top corners and aperture sidewalls connecting said bottom surface with said top corners; depositing a non-conformal liner layer in said aperture such that said non-conformal liner has a first thickness along said sidewalls and a second thickness, larger than said first thickness, at said top corners; depositing a conformal liner in said aperture, said conformal liner having a conformal thickness on said sidewalls that combines with said first thickness to form a combined liner sidewall thickness, wherein said conformal liner selected from the group comprising Ta and TaN; filling said aperture with a metal interconnect material; and planarizing said interconnect member, whereby the distance along a transverse axis perpendicular to said interconnect axis between said metal fill and said top corners is greater than a corresponding distance along a transverse axis between said metal fill and said aperture sidewalls.