Patent ID: 6489622
Filing Date: 2002-12-03
Classification: H01J

Abstract:
An ion implantation apparatus comprising:a target chamber for containing a target for implantation and an ion source chamber includes an ion source for generating an ion beam; said ion source chamber further includes a beam deceleration means for decelerating said ion beam for producing a low energy ion beam; said beam deceleration means further includes a beam steering means for generating an electrostatic field for separating neutralized particles by steering charged particles to transmit in a targeted ion-beam direction slightly different from a direction of said neutralized-particles; and an ion-beam deceleration optics further includes a plurality of electrodes disposed immediately in front of said target chamber for filtering charged particles of said ion beam for generating a spread-out ion beam over an angular range along a beam line of said ion beam according to an energy of each ion of said ion beam for more accurately controlling said energy of said ions for implantation by blocking said neutralized particles and said ions above a maximum implant energy projected as part of said spread-out ion beam from reaching said target for implantation while allowing a remaining portion of said spread-out ion beam below said maximum implant energy to reach said target.