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

Claim 18:
19. 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 first electrical path includes a first plurality of conductive lines,
the first plurality of conductive lines electrically connect the lower electrode with the bias power supply and are connected to the lower electrode at multiple locations having the same distance from a central axis of the lower electrode, the multiple locations being arranged at equal intervals in a circumferential direction with respect to the central axis,
the first electrical path further includes a common conductive line that electrically connects each of the first plurality of conductive lines and the bias power supply,
the first plurality of conductive lines extend from the common conductive line in a radial direction with respect to the central axis and are arranged at equal intervals in the circumferential direction, and
the second electrical path includes a common conductive line that electrically connects the lower electrode or the first electrical path with the impedance adjuster, the second electrical path including a second plurality of conductive lines with the impedance adjuster electrically connected between the common conductive line and each of the second plurality of conductive lines, the second plurality of conductive lines are configured to supply the bias power to the edge ring at multiple locations having the same distance from the central axis, and the multiple locations are arranged at equal intervals in the circumferential direction with respect to the central axis.