Patent ID: 7507644

Claim:
A method of forming a dielectric layer of a flash memory device, the method comprising: forming a tunnel oxide film and a polysilicon layer on a semiconductor substrate; forming a first dielectric layer using a high dielectric material selected from the group consisting of Al 2 O 3 , HfO 2 , ZrO 2 , SiON, La 2 O 3 , Y 2 O 3 , TiO 2 , CeO 2 , N 2 O 3 , Ta 2 O 5 , BaTiO 3 , SrTiO 3 , BST, PZT, and mixed oxides on the polysilicon layer by a remote plasma atomic layer deposition method; forming a second dielectric layer using a high dielectric material selected from the group consisting of Al 2 O 3 , HfO 2 , ZrO 2 , SiON, La 2 O 3 , Y 2 O 3 , TiO 2 , CeO 2 , N 2 O 3 , Ta 2 O 5 , BaTiO 3 , SrTiO 3 , BST, PZT, and mixed oxides on the first dielectric layer by a plasma atomic layer deposition method; nitrifying a top surface of the second dielectric layer; and forming a third dielectric layer on the nitrified top surface of the second dielectric layer.