Patent ID: 7436036
Filing Date: 2008-10-14
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising: providing a semiconductor substrate having a first region to form an NMOS transistor thereon, and a second region to form a PMOS transistor thereon; forming a first gate insulation film comprising a hafnium-based oxide on the first region and second region of the semiconductor substrate; forming a second gate insulation film for shielding reaction between hafnium and silicon on the first gate insulation film of the second region; forming a third gate insulation film on the first gate insulation film of the first region, wherein the third gate insulation film comprises a different material from that of the second gate insulation film; forming a gate conductive film comprising polysilicon on the second and third gate insulation films; patterning the first and third gate insulation films, and the gate conductive film on the first region; and patterning the first and second gate insulation films, and the gate conductive film on the second region.