Patent ID: 6617593
Filing Date: 2003-09-09
Classification: H01J

Abstract:
An ion implantation system comprising:an ion source that generates ions; an electrode plate adjacent the ion source, having a first side facing the ion source, a second side facing away from the ion source, and an aperture formed from the first side to the second side therethrough, the aperture including a first section having a wall extending substantially at right angles from the first side, and a second section having a wall that is tapered to extend from the first section to the second side at an angle other than at right angles relative to the second side so that the aperture is larger at the second side than at the first side; an extraction voltage supply connected between the ion source and the electrode plate to maintain a voltage potential between the ions and the electrode plate so that the ions are attracted to the electrode plate, and then pass through the aperture; and a substrate holder positioned in a path of the ions after leaving the aperture so that the ions are implanted into a substrate held by the substrate holder.