Patent ID: 7211811

Claim:
A method for preventing wafer surface from bombardment by micro-dust particles during a batch-type ion implantation process the method comprises: defining a positive inclined-angle of implantation in such a way that the normal line of the wafer surface inclines to the ion beam in counter-clockwise direction, and a negative inclined-angle of implantation in such a way that the normal line of the wafer surface inclines to the ion beam in clockwise direction; defining the rotating direction of the rotating disk with a plurality of wafer loading pads in such a way that one observes in a direction opposite to the ion source; determining the adoption of either the positive inclined-angle of batch-type implantation or the negative inclined-angle of batch-type implantation; adjusting the rotating direction of the rotating disk and the wafer loading pads into clockwise direction when it comes to performing a implantation at positive inclined angle; adjusting the rotating direction of the rotating disk and the wafer loading pads into counter-clockwise direction when it comes to performing an implantation at negative inclined angle; and wherein the ion implanting surface of the wafer keep from the bombardment by the micro-dust particles during the rotation of the rotating disk system and the wafer loading pads when the batch-type ion beam is implanted into the wafer surface.