Patent ID: 8058156

Claim:
A plasma immersion ion implantation process for implanting a selected implantation species at a desired ion implantation depth profile of said implantation species in a workpiece, comprising: providing a reactor chamber and a set of plural parallel ion shower grids that divide said chamber into an upper ion generation region and a lower process region, each of said ion shower grids having plural orifices in mutual registration from grid to grid, said plural orifices oriented in a non-parallel direction relative to a surface plane of the respective ion shower grid; placing a workpiece in said process region; furnishing a process gas comprising said selected implantation species into said ion generation region; evacuating said process region; applying plasma source power to generate a plasma comprising ions of said selected implantation species in said ion generation region; applying successive grid potentials to successive ones of said grids; and establishing said desired ion implantation depth profile by applying to said workpiece a bias potential that corresponds to said desired ion implantation depth profile.