| 摘要 |
A plasma etching method includes a preparation process for performing a plasma etching process using a processing gas including a first processing gas containing carbon (C) and fluorine (F), a ratio (C/F) of the first processing gas having a first value, and obtaining a residual amount of the mask layer corresponding to a variation point where a variation amount of the bowing CD is increased; a first plasma etching process using the processing gas including the first processing gas until a residual amount of the mask layer reaches the variation point; and a second plasma etching process performed after the first plasma etching process. The second plasma etching process is performed by using a processing gas including at least a second processing gas containing carbon (C) and fluorine (F), and a ratio (C/F) of the second processing gas is smaller than the first value.
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