Silicide-silicon contacts for reduction of MOSFET source-drain resistances
First Claim
1. A method of reducing the contact resistance between a silicide layer and a doped silicon region, wherein the silicide layer and the doped silicon region form an interface comprising:
- implanting a species through the silicide layer into the doped silicon region immediately below the interface after formation of the suicide layer, wherein the implanted species forms traps and induces states in the bandgap of the doped silicon region immediately below the interface such that a contact barrier between the silicide layer and the doped silicon region is reduced.
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Abstract
Methods for reducing the contact resistance presented by the interface between a silicide and a doped silicon region are presented. In a first method, a silicide layer and a doped silicon region form an interface. Either a damage-only species or a heavy, metal is implanted through the silicide layer into the doped silicon region immediately adjacent the interface. In a second method, a second metal is added to the refractory metal before formation of the silicide. After annealing the refractory metal and the doped silicon region, the second metal diffuses into the doped silicion region immediately adjacent the interface without forming additional phases in the silicide.
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Citations
11 Claims
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1. A method of reducing the contact resistance between a silicide layer and a doped silicon region, wherein the silicide layer and the doped silicon region form an interface comprising:
implanting a species through the silicide layer into the doped silicon region immediately below the interface after formation of the suicide layer, wherein the implanted species forms traps and induces states in the bandgap of the doped silicon region immediately below the interface such that a contact barrier between the silicide layer and the doped silicon region is reduced. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of reducing the contact resistance between a silicide layer and a doped silicon region, wherein the silicide layer and the doped silicon region form an interface comprising:
implanting a species through the silicide layer into the doped silicon region immediately below the interface after formation of the silicide layer, wherein the implanted species reduces a contact barrier between the silicide layer and the doped silicon region by causing crystal structure damage in the doped silicon region immediately below the interface, wherein the crystal structure damage is not annealed by a silicide formation heat treatment. - View Dependent Claims (8, 9, 10, 11)
Specification