Patent ID: 11869749
Assignee: SEMES CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A substrate processing apparatus comprising:
a process chamber providing a space for processing a substrate;
a chuck member provided in the process chamber and supporting the substrate;
a radio frequency (RF) power source applying RF power between an upper electrode and a lower electrode to generate plasma in the process chamber, wherein the lower electrode includes the chuck member;
a ring member provided to surround the chuck member; an edge electrode disposed in the ring member to be electrically insulated from the chuck member;
an edge impedance controller electrically connected to the edge electrode and controlling an electric potential of the edge electrode; and
a coupling compensator connected between the chuck member and the edge electrode and configured to prevent the RF power applied to the chuck member from leaking to the edge electrode and to enable the edge impedance controller to control the electric potential of the edge electrode independently from the chuck member by canceling or adjusting a capacitive coupling between the chuck member and the edge electrode,
wherein the coupling compensator includes a first connection point directly connected to the chuck member and a second connection point directly connected to the edge electrode, wherein the edge impedance controller includes a first connection point electrically grounded and a second connection point directly connected to the edge electrodes,
wherein the ring member comprises:
a first ring member provided to surround a circumference of the substrate that is supported by a first portion of the chuck member;
a second ring member formed of an insulation material and disposed under the first ring member to surround a circumference of the first portion of the chuck member; and
a third ring member vertically disposed between a lower surface of the first ring member and a second portion of the chuck member, and horizontally disposed between the first portion of the chuck member and a side portion of the second ring member, wherein the lower surface of the first ring member covers an entire upper surface of the third ring member, and
wherein the entire upper surface of the third ring member is positioned at the same height as an uppermost surface of the second ring member.