Patent ID: 11935727
Assignee: TOKYO ELECTRON LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  C | IPC B  C  H

Claim 10:
11. A substrate processing method comprising:
placing a substrate on a susceptor in a chamber, the substrate being surrounded by an inner ring and an outer ring wherein the outer ring is placed so as to surround the inner ring in the chamber;
etching the substrate by generating a first plasma in the chamber;
unloading the substrate from the chamber;
lifting the inner ring away from a top surface of the susceptor in a state that the substrate is not on the susceptor; and
generating a second plasma in the chamber;
lifting the inner ring in the chamber to expose deposits adhering to the inner ring, wherein the inner ring is lifted to such a position that a bottom surface of the inner ring is higher than the top surface of the susceptor; and
exposing the inner ring to the second plasma while the inner ring is lifted to decompose and remove the deposits in the chamber.