Patent ID: 11965246
Assignee: TOKYO ELECTRON LIMITED
Field: Surface technology, coating (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method of depositing a film over a substrate covered with at least a multilayer film provided with a groove, the method comprising:
forming the multilayer film on the substrate by laminating an insulating film formed of a silicon oxide film and an electrode film formed of a polysilicon film alternately,
performing an etching process so as to form the groove in the multilayer film,
performing a deposition process for depositing the film on the multilayer film provided on the substrate by supplying at least a raw material gas, the deposition process being performed while gradually decreasing an amount of the raw material gas supplied per unit time without simultaneously performing the etching process, and
controlling a thickness of the film to be deposited on a wall surface of the groove linearly and gradually decreases from a top end of the wall surface toward a lower end of the wall surface and a ratio of the thickness of the film at the lower end to the thickness of the film at the top is in a range from 20% to 70%,
wherein a ratio of a ramping time Y to a deposition time X is in a range from 30% to 90%,
wherein the deposition time X (sec) is defined as an entire period of time of the deposition process and the ramping time Y (sec) is defined as an entire period of time of changing the amount of the raw material gas supplied per unit time, and
wherein the method further comprises:
supplying, from a raw material gas nozzle, the raw material gas in a supply region that is arranged between two separation regions, and
evacuating the supply region from an exhaust port that is provided in a concave portion of an inner wall of a processing chamber, said concave portion being curved outwardly in a radial direction of a rotary table, said evacuation port being provided downstream side relative to the raw material gas nozzle.