Patent ID: 8367552
Filing Date: 2013-02-05
Classification: H01L

Abstract:
1. A method for fabrication of in-laid metal structures, comprising the steps of: providing a substrate with a dielectric material having a dielectric constant less than 2.6 on top thereof, depositing a protection layer on top of the dielectric material, depositing a sacrificial layer on top of the protection layer, the sacrificial layer having a mechanical strength which is lower than the mechanical strength of the protection layer, making an opening through the sacrificial layer, through the protection layer and into the dielectric material, depositing a barrier layer in the opening and on the sacrificial layer depositing metal material on the barrier layer, the metal material filling the opening, removing portions of the metal material existing beyond the opening by means of polishing, and removing the sacrificial layer and portions of the barrier layer existing beyond the opening in one polishing step.