Patent ID: 7767561

Claim:
A plasma immersion ion implantation process for implanting a selected species at a desired ion implantation depth profile in a workpiece, comprising: providing a reactor chamber with an ion shower grid that divides said chamber into an upper ion generation region and a lower process region, said ion shower grid having plural elongate orifices oriented in a non-parallel direction relative to a surface plane of said ion shower grid; placing a workpiece in said process region; furnishing said selected species into said ion generation region; evacuating said process region; applying plasma source power to generate a plasma of said selected species in said ion generation region, and applying a grid potential to said ion shower grid to create a flux of ions from the plasma through said grid and into said process region; applying an RF bias voltage to said workpiece, said RF bias voltage corresponding to said desired ion implantation profile, whereby to implant said ions into said workpiece at a depth below a surface of the workpiece according to said ion implantation depth profile; and adjusting ion energy at said workpiece surface by adjusting the frequency of said RF bias voltage.