Patent ID: 6180523
Filing Date: 2001-01-30
Classification: C23C,H01L

Abstract:
A method of fabrication of a contact to a silicon substrate (10) using electroless deposition comprising the steps of:a) forming a contact hole in an insulating layer exposing a substrate; said contact hole defined by sidewalls of said insulating layer;b) forming an adhesion layer on said sidewalls of said insulating layer and said exposed substrate;(1) said adhesion layer is composed of a material selected from the group consisting of Al, Al alloys, polysilicon, Ni, palladium silicide, and amorphous silicon;c) electrolessly depositing a first barrier layer on said adhesion layer;(1) said first barrier layer is composed of a material selected from the group consisting of Ni, Pd, Co, and alloys of Ni, Pd, Co;d) activating said first barrier layer using a PdCl.sub.2 containing solution;e) selectively electrolessly plating a first metal over said first barrier layer filling said contact hole; said first metal deposited using an electroless plating process; said first metal layer is composed of a material selected from the group consisting Cu, Au and alloys of Cu or Au;f) forming a second insulating layer over said first insulating layer, said first metal, said first barrier layer and said adhesion layer;g) patterning said second insulating layer to form a via hole exposing said first metal;h) forming a second barrier layer over said first metal; said second barrier layer composed of a material selected from the group consisting of Ni, Pd or Co;i) activating said second barrier metal using a PdCl.sub.2 containing solution; andj) selectively electroless plating a second metal over said first metal layer filling said via hole; said second metal comprised of Au or Cu.