Patent ID: 6482735
Filing Date: 2002-11-19
Classification: H01L

Abstract:
A method of forming a contact in a semiconductor structure, the method comprising:providing a semiconductor substrate; forming a dielectric layer disposed upon said semiconductor substrate and having a top surface; forming a contact hole that extends within the dielectric layer below the top surface thereof, the contact hole having an aspect ratio of at least about 6:1 and being defined by an exposed portion of said semiconductor substrate and a sidewall on said dielectric layer; wherein the contact hole is formed so as to extend from the exposed portion of said semiconductor substrate to terminate at a contact hole opening below the top surface of the dielectric layer; forming an elongated trench extending from a trench opening at the top surface of said dielectric layer to terminate at the contact hole opening below the top surface of the dielectric layer, said elongated trench being defined by the sidewall of said dielectric layer; forming a refractory metal layer disposed within said elongated trench and said contact hole upon the sidewall of the dielectric layer and around said elongated trench upon the top surface of the dielectric layer; forming a refractory metal silicide structure within the contact hole upon the exposed portion of said semiconductor substrate; forming at least one refractory metal nitride layer by a deposition process using at least TMEDT upon said refractory metal layer within the elongated trench and the contact hole, upon said refractory metal layer over the top surface of the dielectric layer and upon the refractory metal silicide structure; and forming a metallization layer that at least partially fills the elongated trench, extends above the top surface of the dielectric layer along the elongated trench, and is situated upon said at least one refractory metal nitride layer, wherein the metallization layer is offset from and out of contact with the top surface of the dielectric layer.