Patent ID: 6730587
Filing Date: 2004-05-04
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, the method comprising:forming a gate insulating layer on a silicon (Si)-containing semiconductor substrate; depositing a first layer of Si on the gate insulating layer; depositing a layer of titanium (Ti) on the first Si layer; depositing a second Si layer on the Ti layer; patterning the second Si layer, Ti layer, first Si layer and gate insulating layer to form a transistor gate electrode structure having an upper surface and opposing side surfaces; forming a silicon nitride sidewall spacer on the side surfaces of the gate electrode structure leaving exposed adjacent surfaces of the substrate; depositing a layer of nickel on the upper surface of the gate electrode structure, sidewall spacers and exposed surfaces of the substrate; and heating to react the nickel layer on the upper surface of the gate electrode structure with the second Si layer to form a layer of nickel silicide, to react the nickel layer with Si in the substrate to form nickel silicide layers on the exposed surfaces of the substrate, wherein a layer of titanium silicide is formed preventing nickel silicidation of the first Si layer.