Patent ID: 7094638

Claim:
A method of forming a gate structure comprising: providing a substrate, and consecutively forming a gate oxide layer, a polysilicon layer, a silicide layer, and a cap layer onto the substrate; forming a patterned mask layer on the cap layer; patterning the cap layer and the silicide layer to form a first stacked gate structure using the patterned mask layer as a mask; removing a portion of the silicide layer exposed on sidewalls of the first stacked gate structure with an etching solution to form a recess; depositing a passivation layer onto the polysilicon layer and filling the recess, and performing an anisotropic etching process to remove the passivation layer besides the passivation layer filed in the recess to form a second stacked gate structure; removing the polysilicon layer and the gate oxide layer using the second stacked gate structure as a mask; and removing the patterned mask layer.