Patent ID: 6284651
Filing Date: 2001-09-04
Classification: H01L

Abstract:
A method of forming a contact structure, the method comprising:forming a contact opening through an insulating layer, wherein the contact opening has a bottom and has a sidewall defined by the insulating layer, the bottom of the contact opening at a silicon substrate;forming, in an atmosphere devoid of fluorine, a layer of a refractory metal on the bottom of the contact opening;forming, in the contact opening, a layer of an electrically conductive silicon-containing material in contact with the layer of the refractory metal and the sidewall; andheating the refractory metal and the silicon-containing material to form a structure in the contact opening comprising:a refractory metal silicide layer located in the bottom of the contact opening;a refractory metal boride layer located on the refractory metal silicide layer in the contact opening; and whereinthe layer of silicon-containing material fills the remainder of the contact opening.