Patent ID: 6375810
Filing Date: 2002-04-23
Classification: H01J

Abstract:
Apparatus for depositing a layer of material on a workpiece surface, said apparatus comprising:a deposition chamber; a workpiece support providing a workpiece support surface for a workpiece within said chamber, the workpiece support surface having a central region and a peripheral region surrounding the central region; a coil within said chamber, said coil containing the material to be deposited and being adapted to deposit material sputtered from the coil preferentially to the peripheral region of the workpiece support surface; an RF power supply adapted to be coupled to said coil to deliver RF power to said coil to generate a plasma within said chamber, a DC self bias potential being induced in said coil when RF power is delivered to said coil; a sputtering target containing the material to be deposited; and a DC power supply adapted to be coupled to said coil to provide in said coil a second DC bias potential which is different in magnitude from the DC self bias potential.