Patent ID: 6991985

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: (a) providing a semiconductor substrate in which a floating gate electrode is formed; (b) forming a tunnel oxide film on the semiconductor substrate; (c) sequentially forming a first polysilicon film and a pad nitride film on the tunnel oxide film; (d) etching the pad nitride film, the first polysilicon film, the tunnel oxide film and the semiconductor substrate with a patterning process to form a trench in the semiconductor substrate; (e) depositing an oxide film on the entire structure including the trench and then planarizing the oxide film with the pad nitride film until the pad nitride film is exposed; (f) removing the pad nitride film and then depositing a second polysilicon film on the entire structure; (g) patterning the second polysilicon film to form the floating gate electrode; (h) nitrifying a top surface of the floating gate electrode; (i) forming a dielectric film on the entire structure including the floating gate; and (j) forming a material film for a control gate electrode on the dielectric film, wherein the step of nitrifying the top of the floating gate electrode and the step of forming the dielectric film are performed in-situ within the same chamber.