Patent ID: 8927422
Filing Date: 2015-01-06
Classification: H01L

Abstract:
1. A method for forming a raised silicide contact, the method comprising: depositing a layer of silicon directly on top of a silicide partially formed in a silicon containing substrate at a bottom of a contact trench in a dielectric layer above the silicon containing substrate, wherein the silicon layer is deposited anisotropically using a gas cluster implant technique which accelerates clusters of silicon atoms causing them to penetrate a surface oxide on a top surface of the silicide, a width of the silicide is substantially equal to a width of the contact trench; heating the silicide including the silicon layer to a temperature from about 300° C. to about 950° C. by raising the temperature from an ambient temperature at a ramp rate from about 1° C./sec to about 35° C./sec, holding the temperature for less than 600 seconds in an inert atmosphere containing less than about 10 ppm oxygen, and lowering the temperature below 100° C. within a time period from about 10 to about 600 seconds causing silicon from the layer of silicon to react with the remaining silicide partially formed in the silicon containing substrate; and forming a raised silicide from the layer of silicon, wherein the thickness of the raised silicide is greater than the thickness of the silicide and the raised silicide protrudes above a top surface of the silicon containing substrate.