Patent ID: 6670274
Filing Date: 2003-12-30
Classification: H01L

Abstract:
A method of forming a planarized final copper structure, comprising the steps of:providing a structure having a patterned dielectric layer formed thereover; the patterned dielectric layer having an opening formed therein; forming a barrier layer over the patterned dielectric layer and lining the opening; forming an initial planarized copper structure within the barrier layer lined opening, planar with the barrier layer overlying the patterned dielectric layer; recessing the initial planarized copper structure below the barrier layer overlying the patterned dielectric layer a distance to form a recessed copper structure; removing any copper oxide formed upon the recessed copper structure; forming a conductor film over the recessed, copper oxide-free initial copper structure and the barrier layer; removing the excess of the conductor film over the barrier layer and the excess of the barrier layer overlying the patterned dielectric layer by a planarization process to form the planarized final copper structure; the planarized final copper structure comprising: the lower recessed, copper oxide-free initial copper structure; and an overlying planarized conductor film.