Patent ID: 8586140

Claim:
A film formation method for forming a hafnium oxide film by CVD on a target object, the method comprising: supplying a hafnium source gas onto the target object, while obtaining the hafnium source gas by vaporizing a hafnium source material in liquid phase by a vaporizer; supplying an oxygen-containing gas onto the target object; and causing the hafnium source gas and the oxygen-containing gas to react with each other so as to deposit hafnium oxide on the target object, wherein the hafnium source material consists of a mixture of a first organic hafnium compound that is solid at room temperature with a second organic hafnium compound that is liquid at room temperature, the first organic hafnium compound having a higher vapor pressure than the second organic hafnium compound, the first organic hafnium compound and the second organic hafnium compound being mixed at a mixture ratio such that the hafnium source material is liquid at room temperature, the first organic hafnium compound is tetrakisdimethylamino hafnium (TDMAH), and the second organic hafnium compound is tetrakisethymethylamino hafnium (TEMAH) or tetrakisdiethylamino hafnium (TDEAH), and in the mixture ratio, the second organic hafnium compound is set to be 5 to 55 mass % relative to 100 mass % of the first organic hafnium compound.