Patent ID: 7678711
Filing Date: 2010-03-16
Classification: C23C,H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising the steps of forming a gate insulation film over a semiconductor substrate; performing post-annealing on the gate insulation film; and forming a conductive film over the gate insulation film, said step of forming the gate insulation film comprising the steps of forming a first insulation film, and forming over the first insulation film a second insulation film composed of a nitride or an oxynitride using a material gas containing carbon, wherein said step of performing the post-annealing comprises the steps of: performing a first annealing in an atmosphere selected from at least one of the group consisting of an oxidizing atmosphere and an oxynitriding atmosphere at a first temperature; and performing a second annealing in a nitriding atmosphere at a second temperature higher than the first temperature, further comprising, between said step of forming the first insulation film and said step of forming the second insulation film, the step of forming a high dielectric constant film over the first insulation film, and the second insulation film is formed over the high dielectric constant film.