Patent ID: 8581216

Claim:
A method of manufacturing a semiconductor device comprising: outputting an ion beam from a source head; passing the ion beam through a slit of an extraction electrode; guiding the ion beam into a mass analyzing magnet, after passing the ion beam through the slit of the extraction electrode; irradiating the ion beam passing into the mass analyzing magnet to an electric current measuring device that is associated with the mass analyzing magnet and faces an ion exit port of the source head through the extraction electrode; measuring an electric current value with the electric current measuring device; positioning the slit of the extraction electrode based on the electric current value measured while stopping production of a magnetic field of the mass analyzing magnet; curving the ion beam passed through the positioned slit in a magnetic field produced by the mass analyzing magnet; and irradiating the ion beam curved by the mass analyzing magnetic field to a semiconductor substrate, by positioning a mass slit arranged between the mass analyzing magnet and the semiconductor substrate to make a gravity center of the ion beam coincide with a center of the mass slit, and an average incident angle of the ion beam being substantially perpendicularly to the semiconductor substrate.