| 摘要 |
According to one embodiment, a method is described for manufacturing a semiconductor device. The method can form a conductive layer including tungsten on a foundation layer. The method can form a trench by selectively etching the conductive layer. The trench is shallower than a depth from a surface of the conductive layer to the foundation layer. The method can form a protective film on a side surface and a bottom surface of the conductive layer in the trench using a gas containing bromine. The protective film includes a compound of the tungsten and the bromine. The method can remove the protective film on the bottom surface of the conductive layer. The method can etch a portion of the conductive layer below the trench with the protective film on the side surface of the conductive layer.
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