Patent ID: 7601404
Filing Date: 2009-10-13
Classification: H01J,H01L

Abstract:
1. A method for switching decoupled plasma nitridation processes of different doses, comprising: (a) inserting a wafer into a chamber and performing a complete decoupled plasma nitridation process of a first dose on the wafer, wherein the complete decoupled plasma nitridation process comprises an oxide deposition process, a decoupled plasma nitridation doping process, and an annealing process; (b) removing the wafer from the chamber; (c) inserting a dummy wafer into the chamber; (d) inserting a process gas and RF power to the chamber, and performing a decoupled plasma nitridation doping process of a second dose on the dummy wafer; (e) removing the dummy wafer from the chamber; and (f) inserting another wafer and performing a complete decoupled plasma nitridation process of the second dose on the wafer; wherein the dummy wafer inserted in step (c) is treated with a pre-heat process when the first dose is higher than the second dose.