Patent ID: 7931945

Claim:
A film forming method for forming a titanium-containing film on an object, the method comprising: carrying the object into a processing chamber; pre-heating the object in the processing chamber to a film forming temperature while supplying a process gas containing an Ar gas and an H 2 gas into the processing chamber; introducing a TiCl 4 gas into an exhaust line from a gas source to flow through the exhaust line from the gas source without introducing the TiCl 4 gas in the processing chamber; stopping the introducing of the TiCl 4 gas from the gas source into the exhaust line, and introducing the TiCl 4 gas from a gas source into the processing chamber after quantity of flow of the TiCl 4 gas through the exhaust line is stabilized, by switching a valve of the gas source; forming a titanium film on the object by generating plasma of a process gas containing an Ar gas H 2 gas and the TiCl 4 gas, by introducing the Ar gas and the H 2 gas in the processing chamber at a temperature of 400 to 700° C. and at a pressure of 0.5 to 10 Torr, and applying a high-frequency power; exhausting the processing chamber while maintaining introduction of the Ar gas and the H 2 gas and stopping introduction of the TiCl 4 gas; pre-nitriding the titanium film under an atmosphere of a nitriding process gas consisting of the Ar gas, the H 2 gas, and an NH 3 gas without generation of any plasma in the processing chamber, while introducing the NH 3 gas into the processing chamber with the Ar gas and the H 2 gas being continually introduced into the processing chamber; and nitriding the pre-nitrided titanium film by applying a high-frequency power to generate plasma of a nitriding process gas consisting of the Ar gas, the H 2 gas, and the NH 3 gas in the processing chamber, wherein a ratio of a quantity of flow of the NH 3 gas to a quantity of total gas is 0.026 to 0.8 and a ratio of a quantity of flow of the NH 3 gas to a quantity of flow of the H 2 gas is 0.05 to 3 in the pre-nitriding of the titanium film and the nitriding of the pre-nitrided titanium film.