Patent ID: 8008630
Filing Date: 2011-08-30
Classification: H01J

Abstract:
1. An ion implantation apparatus, wherein a traveling direction of an ion beam in a design is a Z direction, and two directions orthogonal to each other in a plane substantially orthogonal to the Z direction are an X direction and a Y direction, which irradiates a target with a ribbon-shaped ion beam having a width in the X direction larger than a width in the Y direction through scanning in the X direction or without scanning in the X direction, and comprises an ion beam deflector which deflects the ion beam in an energy state irradiating the target by a magnetic field or an electric field to separate the ion beam and a neutron from each other, the apparatus comprising: an electric field lens, which comprises a plurality of electrodes opposed to each other in the Y direction with a space for passing the ion beam between the electrodes, is disposed on a downstream side of the ion beam deflector, and narrows the ion beam in the Y direction, wherein the electric field lens has an inlet electrode, an intermediate electrode, and an outlet electrode, which the electrodes are separately arranged in the traveling direction of the ion beam, each of the inlet electrode, the intermediate electrode, and the outlet electrode includes a pair of electrodes which are opposed to each other in the Y direction with a space for passing the ion beam between the electrodes and are substantially parallel to a plane of the ion beam, and the inlet electrode and the outlet electrode are electrically grounded, and a first direct-current voltage source and a second direct-current voltage source respectively apply independent direct-current voltages to the pair of electrodes of the intermediate electrode.