Patent ID: 6758949
Filing Date: 2004-07-06
Classification: C23C,H01J

Abstract:
A metal vapor deposition reactor comprising:a primary reactor chamber having a primary chamber enclosure comprising a ceiling and side wall; a wafer support pedestal within said primary chamber having a planar processing surface for supporting a planar semiconductor wafer; a secondary reactor chamber having a secondary chamber enclosure; a metal source target within said secondary chamber comprising a metal species to be deposited on said semiconductor wafer; a process gas inlet for furnishing process gas into a region of said secondary chamber near a working surface of said metal source target; a D.C. power source connected across said metal source target and a conductive portion of said secondary chamber enclosure, said D.C. power source having sufficient power to support ionization of said process gas near said working surface of said metal source target whereby to form a plasma that sputters metal ions and neutrals from said working surface of said metal source target; a plasma confinement magnet adjacent a back surface of said metal target source opposite said working surface, said plasma confinement magnet comprising one magnetic pole adjacent a central region of said back surface and a second opposite magnetic pole of annular extent surrounding said one pole and adjacent an annular region of said back surface surrounding said central region; a primary opening in said primary chamber enclosure facing said planar process surface of said wafer support pedestal; a secondary opening in said secondary chamber enclosure facing said working surface of said metal source target; an arcuate hollow conduit having a first open end connected to said primary opening and a second open end connected to said secondary opening, whereby said primary and secondary chambers are connected via said arcuate hollow conduit, said hollow conduit having an arcuate central axis of a sufficient curvature to block straight line paths between said first and second ends; a conductive coil wrapped helically around said hollow conduit and having a central axis generally coinciding with said arcuate central axis of said hollow conduit; and a current source connected across said conductive coil, said current source providing an electrical current in said coil to produce magnetic field lines parallel to said arcuate central axis of sufficient strength so that ions drifting from said working surface of said metal source target follow said magnetic field lines to impinge generally perpendicularly on said planar semiconductor wafer.