Patent ID: 8997688
Filing Date: 2015-04-07
Classification: C23C,H01J,H01L,Y02E,Y02P

Abstract:
1. A plasma grid implantation system comprising: a multi-stage differentially pumped system comprising: a conveyor for transporting substrates to be implanted through the multi-stage differentially pumped system; a plasma implant system positioned at the implant stage, the plasma implant system comprising: a plasma source configured to provide plasma in a plasma region; a first grid plate comprising a plurality of apertures configured to allow ions from the plasma region to pass therethrough, wherein the first grid plate is configured to be positively biased by a power supply; a second grid plate comprising a plurality of apertures configured to allow the ions to pass therethrough subsequent to the ions passing through the first grid plate, wherein the second grid plate is configured to be negatively biased by a power supply; a substrate holder configured to support a substrate in a position where the substrate is implanted with the ions subsequent to the ions passing through the second grid plate; and, a third grid plate disposed between the second grid plate and the substrate holder, the third grid plate comprising a plurality of apertures configured to allow the ions to pass therethrough subsequent to the ions passing through the second grid plate, the third grid plate being grounded; and, wherein the first grid plate and the second grid plates are configured to accelerate ions from the plasma, the second grid plate is configured to suppress electrons that come off the substrate, and the third grid plate is configured to function as beam defining grid.