Abstract: A manufacturing method of a semiconductor device includes the following steps. A first gate dielectric layer is formed in a first gate trench and a second gate dielectric layer is formed in a second gate trench. A first bottom barrier layer is formed on the first gate dielectric layer and the second gate dielectric layer. A first conductivity type work function layer is formed on the first bottom barrier layer. A first treatment to the first gate dielectric layer and/or a second treatment to the first bottom barrier layer on the first gate dielectric layer are performed before the step of forming the first conductivity type work function layer. The first treatment and the second treatment are used to modify threshold voltages of specific transistors, and thicknesses of work function layers formed subsequently may be modified for increasing the related process window accordingly.

Abstract: A method of forming a nitrogen-containing oxide film is disclosed. The method comprises (a) exposing a substrate to a first gas pulse having one of an oxygen-containing gas and a metal-containing gas; (b) exposing the substrate to a second gas pulse having the other of the oxygen-containing gas and the metal-containing gas to form an oxide film over the substrate; and (c) exposing the oxide film to a third gas pulse having a nitrogen-containing plasma to form a nitrogen-containing oxide film, wherein the nitrogen-containing oxide film has a nitrogen concentration between about 0.1 and about 3 atomic percent (at %).