Patent ID: 6797967
Filing Date: 2004-09-28
Classification: H01J

Abstract:
A method of exposing a target material to an ion beam in an ion implantation system, the method comprising:detecting an ion beam at a first location with a first detector; detecting the ion beam at a second location with a second detector at the same time as the first detector, quantifying an amount of ion beam neutralization based upon a measurement deviation between the first detector and the second detector, wherein quantifying includes determining a reference ratio at a first ion beam current at the first location of a processing chamber and the second location of a processing chamber, wherein the first location is further from a first target of the ion beam than the second location; determining a current ratio of a second ion beam current at the first location and the second location, wherein the second ion beam current is being used to process a second target; and determining a charge neutralization component of the ion beam at the second target location based on the reference ratio and the current ratio; and controlling a characteristic of the ion beam of the implantation system based upon the amount of ion beam neutralization.