Patent ID: 6992010
Filing Date: 2006-01-31
Classification: H01L

Abstract:
1. A method of forming a gate structure, comprising the steps of: providing a substrate; sequentially forming a gate oxide layer, a polysilicon layer, a metallic layer and an insulation layer over the substrate; patterning the insulation layer, the metallic layer and the polysilicon layer to form a stack structure using a set height level of the polysilicon layer as an etching end point; forming a barrier layer over the stack structure; conducting an etching operation to remove a portion of the sidewalls of the gate structure and form first spacers, continuing the etching operation to remove the polysilicon layer outside the first spacers until the gate oxide layer and the polysilicon layer on the sidewalls of the stack structure are exposed; removing a portion of the exposed polysilicon layer on the sidewalls of the stack structure to form a recess structure; conducting a re-oxidation process to form a re-oxidation layer inside the recess structure; and forming second spacers over the first spacers and the re-oxidation layer.