Patent ID: 8394688

Claim:
A repair layer forming process, comprising steps of: providing a substrate, and forming a gate structure on the substrate, wherein the gate structure at least comprises a gate dielectric layer and a gate conductor layer; performing a nitridation process to form a nitrogen-containing superficial layer on a sidewall of the gate structure; performing a thermal oxidation process to convert the nitrogen-containing superficial layer into a repair layer; forming a first spacer on a sidewall of the repair layer; and forming an additional spacer on a sidewall of the first spacer, wherein the first spacer is a silicon nitride layer with a thickness in a range of 50 angstroms to 100 angstroms, the additional spacer is a multi-layered structure comprising a silicon oxide layer with a thickness in a range of 25 angstroms to 75 angstroms and a silicon nitride layer with a thickness in a range of 200 angstroms to 400 angstroms.