Patent ID: 7645698
Filing Date: 2010-01-12
Classification: H01L

Abstract:
1. A method for forming a barrier layer, comprising: providing a conductive layer; forming a first dielectric layer on said conductive layer, said first dielectric layer having a via therein; forming a first barrier metal layer covering said first dielectric layer and said conductive layer; forming a barrier layer of metallized materials on said first barrier metal layer; removing said barrier layer of metallized materials above said first barrier metal layer on said via bottom in said first dielectric layer, and leaving said barrier layer of metallized materials remaining on a whole sidewall of said via in said first dielectric layer without removing said first barrier metal on said via bottom; and forming a second barrier metal layer covering said barrier layer of metallized materials, wherein the first barrier metal layer and the second barrier metal layer are formed on the via bottom and the first barrier metal layer, the barrier layer of metallized materials and the second barrier metal layer are placed on the whole sidewall of the via.