Patent ID: 8324599

Claim:
A method of implanting ions into a substrate wafer comprising the steps of: mounting the substrate wafer onto a carrier containing a heat sink for removing heat from said wafer during an ion implantation process by thermal contact between said wafer and said heat sink; initiating the ion implantation process so that ions are implanted into said wafer mounted on the carrier; and during said ion implantation process selectively adjusting said thermal contact between said wafer and said heat sink, to control heat removal from said wafer; wherein said step of selectively adjusting said thermal contact comprises: pivotably mounting first and second fence arms on said wafer carrier; supporting a first edge portion of said wafer on said carrier by a first fence provided by said first fence arm at a first edge portion of said carrier; supporting a second edge portion of said wafer on said carrier by a second fence provided by said second fence arm at a second edge portion of said carrier; further supporting by said first and second fences an underside of said wafer facing said heat sink at said first and second edge portions; and pivoting each of said first and second fence arms on said wafer carrier to provide movement of the respective said fence transverse to a plane of the wafer, whereby to selectively adjust the relative position of said wafer on said carrier and said heat sink, between a spaced apart position and a thermal contact position.