Patent ID: 11862440
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 17:
18. Semiconductor processing equipment comprising:
a chamber;
an upper electrode disposed at a top portion of the chamber;
a gas supplier connected to the upper electrode at an outside of the chamber;
a substrate supporting structure spaced apart from the upper electrode in the chamber to define a processing volume, the substrate supporting structure supporting a substrate;
a vertical rod disposed at a lower side of the substrate supporting structure, the vertical rod extending through a bottom portion of the chamber;
a focus ring disposed at an edge of the substrate supporting structure;
an upper edge ring disposed at an outer edge of the focus ring;
an isolator providing an electrical signal to the substrate supporting structure;
a lower edge ring disposed at a side of the isolator and a lower side of the upper edge ring; and
a ground plate connected to the isolator, wherein:
the substrate supporting structure includes:
a lower electrode comprising a side area disposed outside a step formed at an outer perimeter portion of the lower electrode, and a processing area disposed inside the step;
a first plate disposed on the lower electrode;
an attraction electrode disposed on the first plate; and
a second plate disposed on the attraction electrode, the second plate supporting the substrate in a state in which the substrate is laid on an upper surface of the second plate,

each of the first plate and the second plate comprises ceramic, and
an upper surface of the lower electrode is non-planar and has a maximum height aligned with a central portion of the processing area, and
the upper surface of the lower electrode comprises a first peak disposed at the central portion of the processing area, a second peak disposed outside the first peak, and a valley disposed between the first peak and the second peak, when viewed in cross-section.