Importance

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Abstract

In fabricating a contact window to source/drain electrode next to a gate electrode of an integrated circuit: (1) establishing a structure with a window over the source/drain region next to the gate electrode; (2) establishing a region of titanium silicide over the source/drain electrode and establishing a titanium nitride layer over the window and gate electrode; (3) establishing a layer of silicon nitride over the titanium nitride layer; (4) patterning the silicon nitride layer; (5) using the patterned silicon nitride layer as a mask to pattern the titanium nitride layer; (6) adding another silicon nitride layer to seal the gate electrode where it is not protected by titanium nitride; (7) opening a window over the electrode by an anisotropic etch; (8) widening the window with an isotropic etch, using the silicon nitride and titanium nitride as a protective barrier; and (9) adding contact material in said windows.

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First Claim