Patent ID: 7927981

Claim:
A silicon-based thin film depositing method in which a silicon-based thin film is deposited on a film forming portion using a silicon-based thin film depositing apparatus, the silicon-based thin film depositing apparatus including a supporting electrode which is provided in a chamber and capable of supporting the film formation portion, a counter electrode provided so as to face the supporting electrode with a space therebetween, a DC pulse voltage application circuit which applies a DC pulse voltage between the counter electrode and the supporting electrode, a raw material gas injection orifice which injects a raw material gas for depositing the silicon-based thin film from a surface of the counter electrode toward the supporting electrode, and a barrier gas injection orifice which injects a barrier gas in the same direction as the direction in which the raw material gas is injected, so as to surround the raw material gas injected toward the supporting electrode from the surface of the counter electrode, the barrier gas being different from the raw material gas, the method comprising the steps of: (a) supporting the film formation portion on the supporting electrode such that a space equal to or larger than a predetermined distance is formed between the surface of the film formation portion and the counter electrode; and (b) controlling the internal pressure of the chamber to a pressure of more than 1 kPa and applying a DC pulse voltage between the counter electrode and the supporting electrode by the DC pulse voltage application circuit to generate plasma while injecting the raw material gas from the raw material gas injection orifice and also injecting the barrier gas from the barrier gas injection orifice, so as to deposit the silicon-based thin film on the film formation portion.