Patent ID: 6545267
Filing Date: 2003-04-08
Classification: H01J,H01L

Abstract:
A wafer holder which is installed in the target chamber of an ion implantation apparatus, comprising a wafer mount and an electrically conductive elastic body that is laid on the wafer mount and has a surface for holding a wafer thereon, wherein the electrically conductive elastic body has a ten-point mean roughness Rz of 1 to 100 &mgr;m at the surface for holding a wafer, a thickness of 50 to 1000 &mgr;m and a volume resistivity not to exceed 1000 &OHgr;Â·cm, andwherein said electrically conductive elastic body has a surface shape whereby the total contact area between the electrically conductive elastic body surface and a wafer mounted on the electrically conductive elastic body is from about {fraction (1/20)} to about Â½ of the total area of the wafer.