Patent ID: 11970768
Assignee: TOKYO ELECTRON LIMITED
Field: Surface technology, coating (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 0:
1. A film forming method of forming a silicon nitride film on a substrate having a first film and a second film formed thereon using a raw material gas containing silicon and a plasmarized nitriding gas for nitriding the silicon, wherein the first film is different from the second film, the film forming method comprising:
supplying the raw material gas composed of a silicon halide having Si—Si bonds to the substrate;
supplying a non-plasmarized nitriding gas to the substrate;
forming a thin silicon nitride layer covering the first film and the second film by repeating the supplying the raw material gas and the supplying the non-plasmarized nitriding gas in sequential order;
supplying the plasmarized nitriding gas and a plasmarized hydrogen gas to the thin silicon nitride layer so that an impurity in the raw material gas is released and the thin silicon nitride layer is hardened, while the supplying the raw material gas is stopped;
forming the silicon nitride film on the thin silicon nitride layer by supplying the raw material gas and the plasmarized nitriding gas to the substrate; and
supplying the plasmarized hydrogen gas and modifying the silicon nitride film formed on the thin silicon nitride layer,
wherein the first film is a metal film, the second film is a silicon oxide film, and oxygen atoms are present on surfaces of the silicon oxide film and the metal film.