Patent ID: 7507676

Claim:
A film formation method for a semiconductor process for forming an insulating film on a target substrate by CVD, in a process field configured to be selectively supplied with a first process gas containing a silane family gas, a second process gas containing a nitriding gas, and a third process gas containing a carbon hydride gas, the method comprising repeatedly and alternately performing: a first step of performing supply of the first process gas to the process field; a second step of stopping supply of the first, second, and third process gases to the process field; a third step of performing supply of the third process gas to the process field while stopping supply of the first and second process gases to the process field, the third step comprising an excitation period of supplying the third process gas to the process filed while exciting the third process gas by an exciting mechanism; a fourth step of performing supply of the second process gas to the process field while stopping supply of the first and third process gases to the process field, the fourth step comprising an activation period of supplying the second process gas to the process field while exciting the second process gas by an activating mechanism; and a fifth step of stopping supply of the first, second, and third process gases to the process field.