Patent ID: 8455837
Filing Date: 2013-06-04
Classification: C23C,G21K,H01J

Abstract:
1. An ion implanter that irradiates on a target substrate to be processed a ribbon ion beam having a beam width that is wider than a lateral width of the target substrate to be processed and performs ion implantation on the target substrate to be processed, comprising: a beam shaping portion that comprises an ion source that generates an ion beam and shapes the generated ion beam into the ribbon ion beam; a processing portion that irradiates said ribbon ion beam onto the target substrate to be processed; a beam regulating portion that, in order to regulate a current density distribution of said ribbon ion beam in which a total value of current densities in a direction of the beam thickness of said ribbon ion beam is represented by a distribution in a direction of the beam width, arranges unit lens elements along the direction of the beam width of said ribbon ion beam, and regulates and sets an intensity of a magnetic field or electric field to be created by each unit lens element; and a beam controlling portion comprising a measuring portion that measures the current density distribution of said ribbon ion beam regulated by said beam regulating portion, and a setting portion that resets the intensity of the magnetic field or electric field by determining a regulation intensity of the magnetic field or electric field to be created by said unit lens element to be regulated by said beam regulating portion in accordance with the measurement results, and adding said regulation intensity thus determined to the intensity of the magnetic field or electric field presently set in said beam regulating portion, wherein said setting portion determines the regulation intensity of the magnetic field or electric field to be created by a corresponding unit lens element of said unit lens elements that corresponds to a position where said current density distribution thus measured is to be regulated from the current density distribution measured by said measuring portion, determines for the magnetic field or electric field to be created by a unit lens element adjacent to said corresponding unit lens element a value obtained by multiplying said regulation intensity thus determined by a fixed ratio as the regulation intensity of the magnetic field or electric field, and resets the intensity of the magnetic field or electric field using said regulation intensity thus determined.