Patent ID: 7683350

Claim:
An ion implantation method comprising: proceeding an ion implantation scan pass to form a plurality of parallel ion implantation scan lines on a substrate, wherein said ion implantation scan pass is to form an ion implantation scan line parallel to a first direction via an ion beam, and then to shift said ion beam with a scan pitch along a second direction, which is on the plane of said substrate and is perpendicular to said first direction, and then to form another ion implantation scan line via said ion beam along the reverse direction of said first direction, and then to repeat the procedure to form said plurality of parallel ion implantation scan lines on said substrate; rotating said substrate by 180/n degree, shifting said ion beam with an interlace pitch T/2 n along said second direction and repeating one time of said ion implantation scan pass, wherein n is a positive integer equal to or larger than 2 and T is said scan pitch; and repeating the step of rotating said substrate, the step of shifting said ion beam and the step of proceeding said ion implantation scan pass for 2 n−1 times to form interlaced and non-overlapped ion implantation scan lines on said substrate.