End point control in plasma etching

H - Electricity – 01 – L

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204/110, 356/192

H01L 21/465 (2006.01) G01N 21/62 (2006.01) G01N 21/73 (2006.01) H01J 37/32 (2006.01) H05H 1/00 (2006.01)

Patent

CA 1071579

Abstract of the Disclosure The end point in plasma etching is detected by monitoring the optical emission from the plasma, selecting a particular optical emission line and detecting a substantial variation in the intensity of the emission. This indicates a change in material being etched and thus the completion of etching of one material, or the beginning of etching of another material. It is also applicable to removing, or etching, photoresist material. - i -

261108

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