Patent ID: 7338900

Claim:
A method for forming a tungsten nitride film on a surface of an object to be processed, comprising: a tungsten deposition step having a first material gas supply step and a reduction step, wherein the first material gas supply step of supplying a first material gas includes a tungsten compound gas as a main component into a reduced pressure chamber, wherein the object to be processed is placed, and then exhausting the first material gas from the reduced pressure chamber, wherein the reduction step of supplying a reducing gas reduces the tungsten compound to the reduced pressure chamber, and then exhausting the reducing gas from the reduced pressure chamber, and wherein one of the first material gas and the reducing gas is supplied firstly, and molecules of the gas supplied first are deposited on the surface of the object, and after exhausting the gas supplied firstly, another gas is supplied secondly, and the gas supplied secondly reacts with the molecules of the gas supplied firstly on the object, metallic tungsten layer is formed on the object; a tungsten nitride formation step having a second material gas supply step and a nitridation step, wherein the second material gas supply step of supplying a second material gas which includes a tungsten compound gas as a main component into the reduced pressure chamber, and then exhausting the second material gas from the reduced pressure chamber; and the nitridation step of supplying a nitriding gas having nitrogen in its chemical structure and which reacts with tungsten to produce tungsten nitride to the reduced pressure chamber, and then exhausting the nitriding gas from the reduced pressure chamber, wherein one of the second material gas and the nitriding gas is supplied firstly, and molecules of a gas supplied firstly are deposited on the surface of the object, and after exhausting the gas supplied firstly, another gas is supplied secondly, and the gas supplied secondly reacts with the molecules of the gas supplied firstly on the object and tungsten nitride layer is formed on the object, and wherein the tungsten deposition step and the tungsten nitride formation step are repeated in a desired proportion.