Patent ID: 7968472

Claim:
A film forming method comprising: inserting objects to be processed into a processing vessel that can be maintained vacuum, and making the processing vessel vacuum; performing a sequence of forming a ZrO 2 film on a substrate by alternately supplying a zirconium source and an oxidizer to the processing vessel a plurality of times and performing a sequence of forming a SiO 2 film on the substrate by alternately supplying a silicon source and the oxidizer to the processing vessel one or more times, wherein the number of times of performances of each of the sequences is adjusted such that Si concentration of the films is from about 1 atm % to about 4 atm %; and forming a zirconia-based film having a predetermined thickness by performing the film forming sequences for one or more cycles, wherein one cycle indicates that each of the ZrO 2 film forming sequences and the SiO 2 film forming sequences are repeated the adjusted number of times of performances.