Patent ID: 7192789

Claim:
A method for monitoring an ion implanter, comprising: providing a wafer; forming a barrier layer on the surface of said wafer, wherein said barrier layer has a substantial blocking effect on ion implantation that causes a majority of ions to be retained in said barrier layer and only a portion of ions to implant on the surface of said wafer; performing an ion implantation process on said wafer using an ion implanter, a portion of ions penetrating the barrier layer to form a conductive region on the surface of said wafer; performing a thermal treatment process; removing said barrier layer; and measuring a physical property of the conductive region of said wafer after performing the ion implantation process to form the conductive region, performing the thermal treatment process, and removing the barrier layer, wherein said measured physical property of the conductive region of said wafer is indicative of a status of said ion implanter.