Patent ID: 8368036

Claim:
An ion implantation method for performing ion implantation into a substrate, the ion implantation method comprising: reciprocatively scanning an ion beam in a first direction; mechanically driving the substrate in a second direction intersecting the first direction while making a driving speed of the substrate directly proportional to a beam current density of the ion beam in a region where the ion beam is incident on the substrate; wherein a peripheral implantation region surrounds a circular implantation region, and wherein a dose amount of the peripheral implantation region is different from that of the circular implantation region, wherein the dose amount of the peripheral implantation region is formed within a surface of the substrate by: making variable a scanning speed of the ion beam within the surface of the substrate, and changing a scanning speed distribution, in the first direction, of the ion beam within the surface of the substrate for each one-way scanning or each reciprocative scanning, according to a position of the substrate in the second direction, without a rotation of the substrate, and wherein the scanning speed distribution includes a scanning speed distribution in which the scanning speed of the ion beam changes partially.