Patent ID: 7144794

Claim:
A method of manufacturing a semiconductor device which uses an ion implanting device, the ion implanting device comprising: an ion source which includes a chamber having an internal wall surface and an external wall surface and a cathode, which is provided to be insulated from the chamber, capable of emitting a thermal electron into the chamber, and has a cathode cap protruding into the chamber from an external side of an opening part which is formed to pass through from the external wall surface to the internal wall surface of the chamber and a filament disposed inside the cathode cap, the cathode cap and/or the filament being an alloy containing tungsten (W) as a major component and a predetermined metal element as a minor component; an ion introducing/guiding system provided to be connected to the ion source, and introducing/guiding an ion generated in the ion source by introducing a predetermined gas to the ion source; and a susceptor capable of holding a substrate to be processed so as to have the substrate to be processed irradiated with the ion introduced/guided by the ion introducing/guiding system, and the method comprising: introducing the predetermined gas to the ion source; plasmatizing the introduced predetermined gas by the thermal electron emitted from the cathode to generate the ion; and introducing/guiding the generated ion from the ion source by the ion introducing/guiding system and giving an energy of 5 keV or lower to have the substrate to be processed, which is held by the susceptor, irradiated with the ion.