Patent ID: 7291535

Claim:
A method for fabricating a semiconductor device, comprising the steps of: forming a semiconductor region of a first conductive type on a semiconductor wafer; forming a gate electrode on the semiconductor region; forming a first insulating film over a whole surface including an upper surface of the gate electrode, on the semiconductor region; by removing the first insulating film through etching from an upper surface side, forming first sidewalls, covering side surfaces of the gate electrode, from the first insulating film; and by implanting first impurity ions of a second conductive type to the semiconductor region by using an ion implantation device capable of processing a plurality of semiconductor wafers simultaneously, forming first impurity diffusion regions on both sides of the gate electrode in the semiconductor region, wherein in the step of forming the first impurity diffusion regions, implantation of the first impurity ions are dividedly performed a plurality of times, and the semiconductor wafer is rotated about a center axis of the semiconductor wafer for each ion implantation by using a wafer rotator.