Patent ID: 8158516
Filing Date: 2012-04-17
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising: forming a conductive layer including tungsten on a foundation layer; forming a trench by selectively etching the conductive layer, the trench being shallower than a depth from a surface of the conductive layer to the foundation layer; after the forming of the trench, forming 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 including a compound of the tungsten and the bromine; removing the protective film on the bottom surface of the conductive layer; and after the removing of the protective film on the bottom surface of the conductive layer, etching a portion of the conductive layer below the trench with the protective film on the side surface of the conductive layer.