Patent ID: 11875978
Assignee: HITACHI HIGH-TECH CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A plasma processing apparatus that performs, on a wafer in which a multilayer film in which an insulating film and a film to be processed containing a metal are alternately laminated is formed on a substrate, plasma etching of the film to be processed, the plasma processing apparatus comprising:
a processing chamber which is disposed inside a vacuum container;
a sample stage which is disposed inside the processing chamber and on which the wafer is placed;
a detection unit which detects reflected light obtained by the wafer reflecting light emitted to the wafer;
a control unit which controls plasma processing on the wafer; and
an end point determination unit which determines an etching end point of the film to be processed based on a change in an amplitude of vibration in a wavelength direction of a light spectrum of the reflected light, wherein
the control unit receives determination of the endpoint made by the end point determination unit and stops the plasma processing on the wafer.