Patent ID: 8148275

Claim:
A method for forming a dielectric film including metal nitride silicate on a silicon substrate, comprising: a first step of depositing a film containing metal and silicon on the silicon substrate in a non-oxidizing atmosphere using a sputtering method; a second step of forming a film containing nitrogen, metal and silicon by nitriding the film containing metal and silicon using plasma containing at least a nitrogen atom at a temperature in which an amorphous state can be maintained; and a third step of forming a metal nitride silicate film by oxidizing the film containing nitrogen, metal and silicon using microwave plasma having an electronic temperature of 2 eV or less and containing at least oxygen, wherein a ratio of silicon atoms to a total of metal atoms and silicon atoms in the metal nitride silicate film is 10 atom % or more, and wherein in the third step, at least a part of the silicon substrate which is in contact with the metal nitride silicate film is oxidized.