Patent ID: 6071552
Filing Date: 2000-06-06
Classification: C23C,H01L,Y10S

Abstract:
A method of forming a titanium silicide contact on a substrate comprising the steps of:a) forming a first insulating layer having a contact opening over the substrate;b) selectively depositing a silicon layer over said substrate in said contact opening;c) etching said silicon layer using a gas of a material selected from the group consisting of HCL, ClF.sub.3, C.sub.2 F.sub.6 and SiF.sub.4 ;d) selectively depositing a first titanium silicide layer over said silicon layer in said contact opening; said first titanium silicide layer being deposited with a first TiCl.sub.4 to Si containing gas flow ratio; ande) selectively depositing a second titanium silicide layer over said first titanium silicide layer using a selective deposition process with a second TiCl.sub.4 to Si containing gas flow ratio lower than said first flow ratio and using a chloride containing gas of a material selected from the group consisting of HCL and ClF.sub.3 ; said first and second titanium silicide layers forming a titanium silicide contact layer.