Patent ID: 6987046

Claim:
A method for manufacturing a flash memory device, comprising the steps of: sequentially forming a first polysilicon film, a first oxide film, a second polysilicon film and a second oxide film on a semiconductor substrate on which an device isolation film has been formed; etching portions of the second oxide film and the second polysilicon film by using photoresist patterns formed on a predetermined region of the second oxide film as an etch mask, and removing the photoresist patterns; forming a third polysilicon film on the whole surface of the resulting structure and etching the third polysilicon film to form spacers on the sidewalls of the second polysilicon film, thereby forming a first hard mask having the second polysilicon film and the spacers; removing the exposed first oxide film and the second oxide film remaining on the first hard mask; forming floating gate electrode patterns by etching the first polysilicon film with the first hard mask as an etch mask; removing the first hard mask; and, sequentially forming and patterning an ONO film, a fourth polysilicon film, a metal silicide film and a second hard mask on the resulting structure on which the floating gate electrode patterns have been formed, whereby control gate electrode patterns are formed.