Method of making a semiconductor device with aluminum capped copper interconnect pads

摘要

A method for making a semiconductor device is described. That method includes forming a dielectric layer on a substrate, then etching a trench into the dielectric layer. After filling the trench with copper, a portion of the copper is removed to form a recessed copper plug within the dielectric layer. A capping layer that comprises aluminum is then formed on the recessed copper plug.