Patent ID: 6436775
Filing Date: 2002-08-20
Classification: H01L

Abstract:
A method for fabricating a MOSFET device, the method comprising:forming a sacrificial gate on an active region of a substrate; forming source and drain regions in the substrate on both sides of the sacrificial gate; forming an interlayer insulating film above the substrate including above the sacrificial gate; removing the interlayer insulating film above the sacrificial gate and removing the sacrificial gate to define a groove region; forming a gate insulating film over the substrate on the interlayer insulating film and in the groove region; depositing a metal film on the gate insulating film and filling the groove region; polishing the metal film and the gate insulating film to leave the metal film in the groove region and form a metal gate; oxidizing the metal gate to form a metal oxide film having a desired thickness on the surface of the metal gate, wherein in the step of oxidizing, the metal gate is subjected to an N2O plasma treatment; and conducting a rapid thermal oxidation (RTO) process prior to the N2O plasma treatment.