Patent ID: 7300844
Filing Date: 2007-11-27
Classification: H01L

Abstract:
1. A method of forming a gate of a flash memory device, the method comprising the steps of: (a) forming a tunnel oxide film and a first polysilicon layer in an active region of a semiconductor substrate in which the active region and a field region are defined, and forming an isolation film in the field region; (b) sequentially forming a dielectric layer, a second polysilicon layer, a conductive metal silicide film, and a hard mask film on the entire structure including the active region and the field region; (c) etching the hard mask film, the metal silicide film, and a given region of the second polysilicon layer to expose the dielectric layer; (d) stripping a top surface of the exposed dielectric layer of the active region and the field region; (e) stripping a part of the first polysilicon layer of the active region to form dielectric layer horns; (f) stripping the first polysilicon layer and a part of the dielectric layer horns of the active region; and (g) completely stripping the first polysilicon layer and the dielectric layer horns of the active region.