Patent ID: 6713377
Filing Date: 2004-03-30
Classification: C23C,H01L,H05K

Abstract:
A method of forming a metal line using an electroless deposition of Cu or Ni over a adhesion layer composed of polysilicon, Al, or Ti, comprising:a) providing a semiconductor structure; b) depositing a barrier metal layer over said semiconductor structure; (b-1) said barrier metal layer is composed of a material selected from the group consisting of TiW, TiN, MoN, WN, and TaN; c) depositing an adhesion layer over said barrier metal layer, said adhesion layer composed of a material selected from the group consisting of polysilicon, Al, and Ti; d) forming a photoresist pattern over said adhesion layer, said photoresist layer having openings that define an interconnect pattern; e) pickling and activating said adhesion layer; f) selectively electrolessly depositing a metal layer over said adhesion layer, said metal layer composed of a material selected from the group consisting of Cu, Pd and Ni; g) removing said photoresist layer thereby exposing portions of said adhesion layer; and h) dry etching the exposed portion of said adhesion layer and said barrier layer, thereby forming a metal line.