Patent ID: 6984590
Filing Date: 2006-01-10
Classification: H01L

Abstract:
1. A method of manufacturing an EEPROM device, comprising: forming a screen oxide film on a semiconductor substrate; forming a first ion implantation mask defining a gate insulating film forming region on the screen oxide film; performing a first ion implantation on the semiconductor substrate and the first ion implantation mask; performing a first annealing of the semiconductor substrate; removing the screen oxide film and the first ion implantation mask; forming a gate oxide film on the semiconductor substrate; forming a second ion implantation mask defining a gate insulating film forming region on the gate oxide film; performing a second ion implantation on the semiconductor substrate and the second ion implantation mask; performing a second annealing for the semiconductor substrate; removing the second ion implantation mask; and forming a tunnel oxide film on the gate oxide film.