Patent ID: 7419904

Claim:
A method for forming a barrier film by placing an object to be processed in a vacuum atmosphere and forming a barrier film on a surface of the object to be processed, the method comprising: a first material gas supplying step of supplying a first material gas containing a gas of a tungsten compound to the vacuum atmosphere, and subsequently evacuating the first material gas from the vacuum atmosphere, a reducing step of supplying to the vacuum atmosphere a reducing gas of which reduces the tungsten compound, and subsequently evacuating the reducing gas from the vacuum atmosphere, wherein the reducing gas reacts the tungsten compound on the object so that tungsten reduction product is formed on the object, a second material gas supplying step of supplying a second material gas containing a gas of a tungsten compound to the vacuum atmosphere, and subsequently evacuating the second material gas from the vacuum atmosphere, wherein the a tungsten is formed on the object by reacting the tungsten reduction product on the object so that the tungsten layer is formed on the object, a nitriding step of supplying to the vacuum atmosphere a nitriding gas containing nitrogen in its chemical structure and which reacts with the tungsten on the object to generate tungsten nitride, and subsequently evacuating the nitriding gas from the vacuum atmosphere, a third material gas supplying step of supplying a third material gas containing a gas of a tungsten compound to the vacuum atmosphere, and subsequently evacuating the third material gas from the vacuum atmosphere, and a silicon supplying step of supplying a silicon-containing gas containing a gas of a silicon compound to the vacuum atmosphere, and subsequently evacuating the silicon-containing gas from the vacuum atmosphere, wherein a plural of the silicon supplying step is performed more frequently at a upper side of the barrier film than the number of performing the silicon supplying step at lower side.