Patent ID: 6602782
Filing Date: 2003-08-05
Classification: H01L

Abstract:
A method of forming a metal interconnect, comprising the steps of:forming an electrically insulating layer having a contact hole therein, on a substrate; forming an electrically conductive seed layer that extends on a sidewall of the contact hole and on a portion of an upper surface of the electrically insulating layer extending adjacent the contact hole, and is sufficiently thick along an upper portion of the sidewall and sufficiently thin along a lower portion of the sidewall that an upper portion of the contact hole is partially constricted by the electrically conductive seed layer and a constricted contact hole is thereby defined; forming an anti-nucleation layer on a portion of the electrically conductive seed layer that extends outside the constricted contact hole, using the constricted contact hole as a mask to inhibit formation of the anti-nucleation layer adjacent a bottom of the constricted contact hole; then forming a metal liner on a portion of the electrically conductive seed layer that defines a sidewall of the constricted contact hole; and then reflowing a metal interconnect layer into the constricted contact hole.