Patent ID: 9028924
Filing Date: 2015-05-12
Classification: C23C,H01L

Abstract:
1. A method of forming a film stack comprising layers of silicon nitride film and silicon oxide film on a patterned semiconductor substrate in a processing chamber, the method comprising: (a) depositing a silicon nitride film layer via reaction of a nitrogen containing precursor with a first silicon containing precursor, the deposition accelerated by a plasma having a first plasma composition; (b) converting the plasma from having the first plasma composition to having a second plasma composition during which the plasma is continuously maintained in the processing chamber; (c) substantially eliminating the first silicon containing precursor from the processing chamber, the elimination accelerated by the plasma while it has the second plasma composition; (d) converting the plasma from having the second plasma composition to having a third plasma composition during which the plasma is continuously maintained in the processing chamber; (e) depositing a silicon oxide film layer via reaction of a second silicon containing precursor with an oxidant, the deposition accelerated by the plasma while it has the third plasma composition; (f) converting the plasma from having the third plasma composition to having a fourth plasma composition during which the plasma is continuously maintained in the processing chamber; (g) substantially eliminating the oxidant from the processing chamber, the elimination accelerated by the plasma while it has the fourth plasma composition; (h) converting the plasma from having the fourth plasma composition to having the first plasma composition during which the plasma is continuously maintained in the processing chamber; and (i) repeating (a)-(g) to form another silicon nitride film layer and another silicon oxide film layer.