Patent ID: 9190336
Filing Date: 2015-11-17
Classification: H01J,H01L

Abstract:
1. A plasma processing apparatus having a wafer disposed in a processing chamber inside a vacuum container, the plasma processing apparatus being configured to process a film structure disposed on the wafer using a plasma generated in the processing chamber, the film structure having a plurality of film layers disposed on the wafer including a film layer to be processed and a mask layer disposed on the film layer to be processed, the plasma processing apparatus comprising a determination unit configured to: compare a plurality of synthesized light intensity patterns with a light intensity pattern of light from the processing chamber detected during processing of the film layer to be processed; compare a film thickness corresponding to a synthesized light intensity pattern, which has a minimum difference from the light intensity pattern detected during processing, with a target film thickness; and determine whether the film thickness of the film to be processed reached the target film thickness, wherein the synthesized light intensity patterns use wavelength as a parameter, and the light intensity pattern detected during processing uses wavelength as a parameter, and wherein the plurality of synthesized light intensity patterns are obtained by synthesizing interference light intensity patterns with light intensity patterns obtained from interference light detected from the mask layer, the interference light intensity patterns having been obtained from interference light detected from a previous processing of the film layer to be processed on another wafer, wherein the interference light intensity patterns use wavelength as a parameter, and the light intensity patterns obtained from interference light detected from the mask layer use wavelength as a parameter.