Patent ID: 11929239
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A plasma processing apparatus, comprising:
a processing chamber;
an upper electrode disposed in an upper region of the processing chamber and connected to a first power supply;
a lower electrode disposed below the upper electrode, supporting a wafer, and connected to a second power supply;
an edge ring disposed to surround an edge of the lower electrode and formed of a first semiconductor material having a first resistivity value;
a first ring supporting a lower portion of the edge ring, formed of a material having a second resistivity value lower than the first resistivity value, and connected to a third power supply;
an electrode ring disposed in a region overlapping the first ring, in contact with a lower surface of the edge ring, and formed of a second semiconductor material having a third resistivity value greater than the first resistivity value;
a first pad only attached to the lower surface of the edge ring and a bottom surface of a stepped portion disposed at an edge of the lower electrode; and
a second pad only attached to a lower surface of the electrode ring and an upper surface of the first ring,
the first ring is surrounding an outer peripheral surface below the stepped portion,
wherein a radio frequency (RF) power from the third power supply is applied to the edge ring through the first ring to form an electric field above the edge ring,
wherein the first resistivity value is a value of 1 S/cm to 10 Ωcm,
wherein the third resistivity value is a value of 90 S/cm to 1000 Ωcm,
wherein each of the first and second pads includes an adhesive material, and
wherein a width of the first ring is the same as a width of the electrode ring.