| 摘要 |
An object of the present invention is to obtain a favorable etching shape in etching an organic film formed on a substrate. A semiconductor device manufacturing method according to the present invention comprises the steps of: etching with plasma a silicon-containing film and transferring a pattern of a pattern mask stacked on the silicon-containing film onto the silicon-containing film to form a patterned silicon-containing film; removing the pattern mask using plasma to expose the surface of the silicon-containing film; and etching the surface of the organic film through the patterned silicon-containing film by use of oxygen active species in plasma to form a concave portion on the organic film. Thereafter, the silicon-containing film is sputtered to form silicon-containing protection films on the inner wall surfaces of the concave portion. The concave portion is further etched in its depth direction through the patterned silicon-containing film by use of oxygen active species in plasma. Thus, the concave portion can be further etched while the side walls of the concave portion are protected from active oxygen species.
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