Patent ID: 8071473

Claim:
A semiconductor device manufacturing method for etching with plasma a substrate having an organic film, a silicon-containing film on the organic film, and a pattern mask on the silicon-containing film to form a hole or groove in the organic film, the method comprising the steps of: preparing a substrate having an organic film, a silicon-containing film on the organic film, and a pattern mask on the silicon-containing film; etching with plasma the silicon-containing film of the substrate and transferring a pattern of the pattern mask 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; etching the surface of the organic film through the patterned silicon-containing film by use of an oxygen active species in plasma to form on the organic film a concave portion having a depth that is smaller than the thickness of the organic film; sputtering the silicon-containing film to form silicon-containing protection films on the inner wall surfaces of the concave portion; and further etching the concave portion of the organic film, on which the protection films are formed, in the depth direction of the concave portion through the patterned silicon-containing film by use of an oxygen active species in plasma to form a hole or groove.