Patent ID: 8168962
Filing Date: 2012-05-01
Classification: H01J

Abstract:
1. A method of implanting a wafer, comprising: forming an ion beam in an elongated shape, wherein said shape has a length along a first axis longer than a diameter of said wafer and a width along a second axis shorter than said diameter of said wafer; moving a center of said wafer along a scan path intersecting said ion beam at a movement velocity and rotating said wafer at a rotation velocity simultaneously, wherein said wafer is totally overlapped with said ion beam along said first axis when said wafer intersects with said ion beam, and wherein said rotation velocity is slower than said movement velocity when said rotation velocity is defined by a tangential velocity parallel to said scan path on an edge of said wafer; and recording an error position and pausing said simultaneously moving and rotating step by immediately blocking said ion beam when an error of said ion beam is detected, and then continuing a movement and a rotation of said simultaneously moving and rotating step until said wafer stops at a first end of said scan path with said blocked ion beam.