Patent ID: 8324038

Claim:
A method of manufacturing a metal-oxide-semiconductor transistor device, comprising: forming a gate electrode on a semiconductor substrate and forming a drain/source region in the semiconductor substrate beside the gate electrode; forming a spacer on at least one sidewall of the gate electrode; forming a material layer on top of the drain/source region and the gate electrode; performing a deposition process to blanketly deposit a protective layer on the material layer and the spacer, such that the protective layer has a first thickness on the spacer and a second thickness on the material layer and the first thickness is less than the second thickness; performing a first etching process to partially remove the protective layer, such that all the portion of the protective layer on the spacer is substantially removed, and all the portion of the protective layer on the material layer has a remained thickness less than the second thickness; performing a second etching process to substantially remove all of the spacer; after performing the second etching process, removing the protective layer having the remained thickness on the material layer; and forming a contact etch stop layer covering the gate electrode and the drain/source region.