Patent ID: 7229917

Claim:
A method for forming a film of ruthenium or ruthenium oxide, comprising: supplying a raw material gas comprising Ru(C 5 H 5 ) 2 or Ru(C 2 H 5 C 5 H 4 ) 2 and a first assist gas comprising ozone or oxygen into a process container, which accommodates a target substrate having an underlying layer on a surface, thereby forming a seed film on the underlying layer by CVD; and supplying the raw material gas and a second assist gas comprising an oxidizing gas to react with the raw material gas into the process container, thereby forming a main film on the seed film by CVD, wherein forming the seed film comprises a plurality of first periods and a plurality of second periods performed alternately and continuously, each first period is set to supply the raw material gas into the process container while stopping supply of the first assist gas, and each second period is set to supply the first assist gas into the process container while stopping supply of the raw material gas, wherein the first and second periods are performed while vacuum-exhausting the process container, and wherein the plurality of first periods and the plurality of second periods are performed alternately and continuously such that, between the plurality of first periods and the plurality of second periods, there are no purge periods of removing residual gases by supplying a purge gas into the process container, or vacuum-exhaust periods of performing vacuum-exhaust of the process container while stopping supply of all gases.