H - Electricity – 01 – L
Patent
H - Electricity
01
L
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
Poulsen Robert G.
Smith Gerald M.
Westwood William D.
Northern Telecom Limited
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