Patent ID: 9425092
Filing Date: 2016-08-23
CPC Classification: H01L

Claim Text:
1. A method for forming an interconnect in a workpiece, the method comprising: electrochemically depositing a second metallization layer on the workpiece comprising a nonmetallic substrate having a dielectric layer disposed over a substrate and a continuous first metallization layer disposed on the dielectric layer and having at least one microfeature comprising a recessed structure, wherein the first metallization layer at least partially fills a feature on the workpiece, where the first metallization layer is a single metal layer, and wherein the second metallization layer is a copper layer that is different from the metal of the first metallization layer; electrochemically depositing a copper cap layer after filling the feature; and annealing the workpiece to diffuse the metal of the second metallization layer into the metal of the first metallization layer.