Patent ID: 6410408
Filing Date: 2002-06-25
Classification: C23C

Abstract:
A CVD film formation method for forming a CVD film on a plurality of semiconductor substrates by using a CVD device that comprises a reaction chamber for forming a CVD film, a first exhaust line which is connected to the reaction chamber and does not include a turbo pump, and a second exhaust line which is connected to the reaction chamber separately from the first exhaust line and which includes a turbo pump, the method comprising:a first process, which is repeated a number of times that corresponds to a predetermined number of substrates, and which comprises: a step of introducing a semiconductor substrate into the reaction chamber to form a CVD film thereon, and removing the semiconductor substrate, whose film formation is completed, from the chamber, in a state in which, while reactive gas is being supplied to the reaction chamber, the turbo pump is driven to exhaust the reactive gas via the second exhaust line such that the chamber is held at a predetermined internal reaction pressure; and a step of performing low-pressure cleaning of the reaction chamber, from which the semiconductor substrate has been removed, by, while supplying cleaning gas to the reaction chamber, discharging the gas via the second exhaust line such that the chamber is held at a predetermined low internal pressure that is higher than the pressure during the film formation; and a second process in which high-pressure cleaning of the inside of the reaction chamber is performed by, while supplying cleaning gas to the reaction chamber, discharging the gas via the first exhaust line such that the chamber is held at a predetermined high internal pressure that is higher than the pressure during the film formation.