Patent ID: 6426286
Filing Date: 2002-07-30
Classification: H01L

Abstract:
A method for producing an interconnection system between a bottom metal layer and a top metal layer, the method comprising the steps of:depositing the bottom metal layer by, depositing a conduction layer, and forming an overlying barrier layer on the conduction layer, patterning the bottom metal layer to produce a patterned bottom metal layer having a sidewall, selectively oxidizing the sidewall of the bottom metal layer to form a lateral barrier layer against the sidewall of the bottom metal layer, depositing an insulation layer over the bottom metal layer, etching vias through the insulation layer to the bottom metal layer using an etchant, where the overlying barrier layer and the lateral barrier layer are relatively resistant to the etchant as compared to the insulation layer, depositing the top metal layer through the vias to electrically contact the bottom metal layer, where the overlying barrier layer and the lateral barrier layer are relatively resistant to interaction with the top metal layer as compared to the conduction layer.