Patent ID: 11955314
Assignee: TOKYO ELECTRON LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. An apparatus for plasma processing comprising:
a chamber;
a substrate support, having a lower electrode and an electrostatic chuck, configured to support a substrate on the electrostatic chuck in the chamber;
a radio frequency power supply configured to supply a radio frequency power to generate plasma in the chamber;
a bias power supply configured to supply a bias power;
a first electrical path that electrically connects the bias power supply with the lower electrode;
a second electrical path that is different from the first electrical path and the lower electrode and configured to supply the bias power from the lower electrode or the first electrical path to an edge ring disposed to surround an edge of the substrate; and
an impedance adjuster configured to provide a variable impedance to the second electrical path,
wherein the second electrical path includes a common conductive line that electrically connects the lower electrode or the first electrical path with the impedance adjuster,
wherein the common conductive line of the second electrical path extends from the lower electrode on a central axis of the lower electrode,
the second electrical path further includes a plurality of conductive lines extending in the radial direction with respect to the central axis,
the impedance adjuster is electrically connected between the common conductive line of the second electrical path and each of the conductive lines of the second electrical path, and
the conductive lines of the second electrical path are configured to supply the bias power to the edge ring at multiple locations having the same distance from the central axis, the multiple locations being arranged at equal intervals in the circumferential direction with respect to the central axis.