Patent ID: 6458430
Filing Date: 2002-10-01
Classification: C23C,H01J,H01L

Abstract:
In a plasma immersion ion implantation process for implanting dopant ions into a surface of a substrate having an organic photoresist which forms a photoresist mask thereon, wherein said plasma immersion ion implantation process includes placing the substrate having the photoresist mask thereon into a chamber having walls of electrically conductive material, generating an implant plasma of ions from a first ionizable source wherein said ions include electrically active dopants when implanted into the substrate, and applying voltage pulses between the chamber walls and the substrate independently of the generating of the implant plasma for selectively implanting the electrically active dopant ions into the surface of the substrate, wherein the substrate is pretreated prior to the step of generating the implant plasma so as to substantially prevent implantation of carbon ions resulting from a reaction of the electrically active ions with the organic photoresist, said pretreatment process comprising the steps of:a) generating a pretreating plasma from a second ionizable source to produce pretreatment ions that become electrically inactive when implanted in the substrate; b) reacting the pretreatment ions with the organic photoresist to cause outgassing of an organic reactant product of said pretreatment ions and said photoresist; and c) evacuating said chamber to remove the organic reactant product.