Patent ID: 6136705
Filing Date: 2000-10-24
Classification: H01L

Abstract:
A method for forming self-aligned dual thickness cobalt silicide layers during the manufacturing of a semiconductor device, the method comprising the steps of:providing a semiconductor device structure including:a silicon substrate with at least one exposed silicon substrate surface; anda silicon layer structure disposed above the silicon substrate, the silicon layer structure having an exposed silicon layer structure surface;depositing a cobalt layer on the semiconductor device structure;depositing a titanium capping layer on the cobalt layer;selectively reducing the thickness of the titanium capping layer above the exposed silicon layer structure surface;reacting cobalt in the cobalt layer with silicon in the exposed silicon substrate surface and silicon in the exposed silicon layer structure surface to form a first self-aligned cobalt silicide (CoSi) layer on the exposed silicon substrate surface and to concurrently form a second self-aligned cobalt silicide (CoSi) layer on the exposed silicon layer structure surface, the first self-aligned cobalt silicide (CoSi) layer being thinner than the second self-aligned cobalt silicide (CoSi) layer; andremoving the titanium capping layer and any unreacted cobalt.