Patent ID: 6123825
Filing Date: 2000-09-26
Classification: C25D,H01L,Y10T

Abstract:
A process for forming an electromigration-resistant electroplated copper film, comprising the steps of:(a) providing a seed layer at least indirectly on a substrate, said seed layer having an exposed surface;(b) immersing said substrate in a plating solution;(c) electrodepositing a copper-containing film on said exposed surface of said seed layer, said copper-containing film having a first surface and a first impurity concentration;(d) maintaining said substrate in an immersed state within said plating solution to form a laminated impurity film having a second impurity concentration being greater than said first impurity concentration;(e) electrodepositing a further copper-containing film from said plating solution onto said first surface, said further copper-containing film having a third impurity concentration being less than said second impurity concentration;(f) removing said substrate from said plating solution; and(g) drying said substrate.