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

Claim 5:
6. A film forming apparatus for 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 apparatus comprising:
a rotary table configured to place the substrate thereon and to cause the substrate to revolve;
a processing gas supply part configured to supply the raw material gas composed of a silicon halide having Si—Si bonds onto the rotary table;
a nitriding gas supply part configured to supply the plasmarized nitriding gas and a non-plasmarized nitriding gas onto the rotary table;
a modifying gas supply part configured to supply a nitriding gas and a hydrogen gas to the rotary table;
a plasma-forming mechanism configured to plasmarize the nitriding gas and the hydrogen gas supplied to the rotary table; and
a controller configured to perform a processes of: repeatedly supplying the raw material gas and the non-plasmarized nitriding gas which has not been plasmarized, to the revolving substrate in an alternate manner so as to form a thin silicon nitride layer that covers the first film and the second film; 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; repeatedly supplying the raw material gas and the plasmarized nitriding gas to the revolving substrate in the alternating manner so as to form the silicon nitride film on the thin silicon nitride layer; and supplying the plasmarized hydrogen gas so as to modify the silicon nitride film formed on the thin silicon nitride layer,
wherein the first film is a metal film.