Patent ID: 6126806
Filing Date: 2000-10-03
Classification: H01L,Y10T

Abstract:
A process for forming a copper-containing film, comprising the steps of:(a) forming a seed layer at least indirectly on a semiconductor substrate, said seed layer including copper and an additive;(b) forming a bulk copper-containing film on said seed layer, said bulk copper-containing film including associated grain boundaries and an exposed surface;(c) contacting said exposed surface with an electroplating solution and mechanically removing said electroplating solution from said surface within an oxygen environment, thereby roughening said exposed surface;(d) laminating an impurity film onto said exposed surface by immersing said substrate in said electroplating solution, said impurity film including copper and an impurity and having a first impurity concentration;(e) forming a further bulk copper-containing film on said impurity film, said further bulk copper-containing film including said impurity, a second impurity concentration, associated grain boundaries, and a further exposed surface;(f) drying said substrate; and(g) annealing said substrate to form a plurality of compounds disposed along said grain boundaries, the majority of said plurality of compounds including said additive and said impurity in combination;wherein said first impurity concentration is greater than said second impurity concentration.