Patent ID: 8786031

Claim:
A semiconductor device comprising: a silicon substrate; a gate insulating film provided on the silicon substrate; and a gate electrode provided on the gate insulating film, wherein the insulating film is a high permittivity insulating film including a metal oxide, a metal silicate, a metal oxide into which nitrogen is introduced, or a metal silicate into which nitrogen is introduced, the gate electrode has: a metal-containing layer containing at least one selected from TiN, WN, and Si provided on the gate insulating film, the metal-containing layer not being a film composed of WSi; a metal nitride layer containing Ti, Al, and N provided on the metal-containing layer; and a silicon layer provided on the metal nitride layer, and a molar fraction of Ti, Al, and N of the metal nitride layer, expressed as (N/(Ti+Al+N)), is 0.53 or more a molar fraction of Ti, Al, and N of the metal nitride layer, expressed as (Ti/(Ti+Al+N)), is 0.32 or less; and a molar fraction of Ti, Al, and N of the metal nitride layer, expressed as (Al/(Ti+Al+N)), is 0.15 or less.