Patent ID: 11887821
Assignee: TOKYO ELECTRON LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. An edge ring comprising:
a first edge ring integrally formed by silicon carbide and configured to surround a periphery of a substrate provided in a processing container of a plasma processing apparatus, a top surface of the first edge ring being a contact surface with plasma generated inside the processing container;
a second edge ring formed by a material in which the silicon carbide and silicon are mixed in a predetermined ratio and configured to surround the periphery of the substrate, a top surface of the second edge ring being bonded to a side opposite to the contact surface of the first edge ring; and
a third edge ring formed by the silicon and configured to surround the periphery of the substrate, a top surface of the third edge ring being bonded to a bottom surface of the second edge ring and a bottom surface of the third edge ring contacting with an electrostatic chuck,
wherein the third edge ring is divided into a plurality of parts in a circumferential direction, and a groove is formed between each of the plurality of parts such that adjacent parts of the third edge ring have a predetermined distance therebetween in the circumferential direction, and
wherein the groove is formed by side walls of the adjacent parts of the third edge ring, and a bottom wall of the first edge ring that serves as a ceiling wall when viewed in a vertical cross section.