Patent ID: 6787451
Filing Date: 2004-09-07
Classification: H01L

Abstract:
A method for manufacturing a semiconductor device having a field effect transistor in which a metal oxide film of a higher dielectric constant than that of a silicon oxide film formed on a silicon substrate is used as a gate insulation film, comprising:forming the metal oxide film on the silicon substrate; forming a first silicon oxide film or a silicon oxynitride film with a thickness of 0.5 nm or more between the silicon substrate and the metal oxide film by a first heat treatment in an oxidative atmosphere at a first temperature; forming a gate of the field effect transistor on the metal oxide film after the first heat treatment; implanting impurity ions into source and drain regions in the silicon substrate; and activating the source and drain regions by a second heat treatment at a second temperature, wherein the first temperature is equal to or more than the second temperature.