Patent ID: 7638782

Claim:
A semiconductor device manufacturing method comprising the steps of: (a) forming an insulating film on a semiconductor region; and (b) implanting an impurity ion into the semiconductor region on which the insulating film is formed, wherein in the step (b), the impurity ion is implanted into the semiconductor region in a form of a pulsed ion beam for intermittent irradiation, the semiconductor region is a semiconductor substrate or a semiconductor layer formed on a semiconductor substrate, in the step (b), the ion beam scans the semiconductor substrate in a first direction within a substrate surface thereof while the semiconductor substrate is scanned in a second direction intersecting with the first direction within the substrate surface thereof, and in the step (b), the ion beam is implanted so that a pulse width t [s] of the intermittent pulsed beam fulfills: t [s]≦(a capacitance per unit area [F/cm 2 ] of the insulating film×2d [cm]×10 7 [V/cm])/(an average current density [A/cm 2 ] of the ion beam), wherein d[cm] is a film thickness of the insulating film.