Patent ID: 8518283
Filing Date: 2013-08-27
Classification: H01J,H01L

Abstract:
1. A plasma etching method capable of detecting an end point in which a Si film of a silicon substrate including the Si film formed on a surface side and a lower layer film formed below the Si film is etched, the plasma etching method for etching the Si film by supplying etching gas containing SF 6 gas so that plasma is formed, wherein at least two steps of a large-amount supply step of supplying a large amount of SF at least an emission intensity of Si or fluorinated silicon in the plasma at the small-amount supply step is measured, only the emission intensity measured at the small-amount supply step is used to determine whether an etching end point where the lower layer film is exposed is reached, and when the emission intensity of Si or fluorinated silicon becomes equal to or less than a previously set reference value, a determination is made that the etching end point is reached, and a process is ended.