Patent ID: 6171943
Filing Date: 2001-01-09
Classification: C23C,H01L

Abstract:
A method of forming a contact, comprising:cleaning a contact hole with a high density Ar/NF.sub.3 plasma;operating a chemical vapor deposition (CVD) chamber at a pressure of approximately between 0.1 and 100 Torr;heating the contact hole to approximately been 300 and 700 degrees Celsius;introducing TiCl.sub.4 into the CVD chamber at a flow rate of approximately between 5 and 40 sccm;introducing H.sub.2 into the CVD chamber at a flow rate of approximately between 1,000 and 5,000 sccm;introducing argon into the CVD chamber at a flow rate of approximately between 500 and 5,000 sccm;forming titanium silicide by plasma assisted CVD in the CVD chamber according to a first chemical process described by TiCl.sub.4 +Si.sub.n H.sub.2n+2+H.sub.2.fwdarw.TiSi.sub.x +HCl, and a second chemical process described by TiCl.sub.4 +Si+H.sub.2.fwdarw.TiSi.sub.x +HCl, wherein n is greater than or equal to 1, and x is less than or equal to 2;forming a barrier layer on the titanium silicide;forming, by CVD, a plug material on the barrier layer; andcreating a plasma in the CVD chamber using an energy source of approximately between 100 and 1,000 Watts.