Patent ID: 7851772
Filing Date: 2010-12-14
Classification: H01J

Abstract:
1. An ion implantation apparatus including a beam line of implanting an ion by irradiating an ion beam extracted from an ion source to a wafer by way of a mass analysis magnet apparatus and a mass analysis slit arranged on a downstream side thereof, wherein the mass analysis apparatus is configured to separate an ion other than the desired ion from an incident ion beam, the ion beam being converged in the horizontal direction at the mass analysis slit and diverged after passing through the mass analysis slit, the ion implantation apparatus comprising: a deflecting apparatus arranged at a section of the beam line from an outlet of the mass analysis magnet apparatus to a front side of the mass analysis slit, for deflecting the ion beam in a vertical direction deviated from a beam trajectory line and to a lower side from the beam trajectory line by an operation of an electric field; wherein the deflecting apparatus is configured so as to carry out, a high speed evacuating operation of an ion beam evacuation from the beam trajectory line, and a temporary evacuating operation which comprises the high speed evacuating operation and a maintaining operation of an evacuated state for a predetermined time period; and wherein the ion implantation apparatus further comprises dose amount measurement means for measuring a dose amount into the wafer by incidence of the ion beam, determination means for determining whether the measured dose amount is proper or not, and control means for carrying out the temporary evacuating operation of the ion beam by the deflecting apparatus when the measured dose amount is determined to be improper in implanting the ion.