Patent ID: 7906168

Claim:
A film formation method for a semiconductor process for forming a silicon oxide film by CVD, on a plurality of target substrates placed at intervals in a vertical direction inside a process field configured to be selectively supplied with SiH 3 NC 2 (CH 3 ) 4 gas and O 2 gas, the method repeating a cycle a plurality of times to form a plurality of laminate thin films, thereby forming the silicon oxide film with a predetermined thickness, the cycle comprising: an adsorption step of supplying the SiH 3 NC 2 (CH 3 ) 4 gas to the process field without supplying the O 2 gas to the process field, thereby forming an adsorption layer containing silicon on a surface of the target substrate; then a first purge step of exhausting gas from the process field without supplying the SiH 3 NC 2 (CH 3 ) 4 and O 2 gases to the process field; then an oxidation step of supplying the O 2 gas to the process field without supplying the SiH 3 NC 2 (CH 3 ) 4 gas to the process field, thereby oxidizing the adsorption layer on the surface of the target substrate; and then a second purge step of exhausting gas from the process field without supplying the SiH 3 NC 2 (CH 3 ) 4 and O 2 gases to the process field, wherein a process temperature of 25 to 100° C. is set through the cycle, the adsorption step uses a pressure of 133 to 3,990 Pa inside the process field, and the oxidation step supplies the O 2 gas to the process field while exciting the O 2 gas by turning the O 2 gas into plasma in an exciting mechanism, thereby generating radicals from the O 2 gas and oxidizing the adsorption layer on the surface of the target substrate by use of the radicals.