Patent ID: 7838399

Claim:
A method for implanting ions into a substrate by a plasma immersion ion implantation process, comprising: providing a substrate into a processing chamber; generating a plasma from a gas mixture including a reacting gas and an etching gas in the processing chamber; implanting ions from the plasma into the substrate; and adjusting the ratio between the reacting gas and the etching gas in the supplied gas mixture while implanting ions into the substrate, wherein the adjusting the ratio between the reacting gas and the etching gas further comprises: initially supplying a greater amount of reacting gas than the etching gas into the chamber; and increasing the ratio of the etching gas to the reacting gas present in the gas mixture, wherein the increasing the ratio of the etching gas further comprises increasing a flow rate of etching gas in the gas mixture at a rate of between about 10 sccm per second and about 100 sccm per second.