Patent ID: 6358376
Filing Date: 2002-03-19
Classification: H01J

Abstract:
A DC sputter reactor, comprising:a vacuum chamber having sidewalls extending along a center axis; a target sealed to said sidewalls; a support electrode in said chamber for holding on a support surface located at its front a substrate to be sputter deposited in opposition along said axis to said target; a magnetron disposed on a back side of said target relative to said support and rotatable about a center of said target; a first shield arranged around first portions of said sidewalls adjacent to said target and configured to protect said first portions from sputter deposition and held at a predetermined first potential; a first DC power supply selectively connected to said target and capable of biasing said target negatively with respect to said predetermined first potential to create a plasma in said chamber; an RF power supply connected to said support electrode to create a negative DC self-bias on said support surface relative to said predetermined first potential; a second shield having side portions arranged around second portions of said sidewalls disposed further away from said target than said first portions both in front of and in back of a plane of said support surface and configured to protect said second portions from sputter deposition and having bottom portions extending from said support electrode toward said second portions of said sidewalls in back of said support surface; and a second DC power supply selectively connected to said second shield and capable of biasing said second shield to a shield voltage more positive than said predetermined first potential.