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

Claim 9:
10. A plasma processing method in which a plasma processing apparatus including a processing chamber which is disposed inside a vacuum container, a sample stage which is disposed inside the processing chamber and on which a wafer is placed, a light detection unit, a control unit which controls plasma processing on the wafer, and an end point determination unit which determines a plasma etching end point of the wafer, is used to perform, 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 method comprising:
using the light detection unit to detect reflected light obtained by the wafer reflecting light emitted to the wafer;
using the end point determination unit to determine 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; and
using the control unit to receive determination of the end point made by the end point determination unit and stop the plasma processing on the wafer.