Patent ID: 6869848

Claim:
A method of manufacturing a flash memory device, comprising: performing an ion implantation for controlling a threshold voltage on a semiconductor substrate; performing a spike annealing for controlling a doping concentration and a doping profile of an implanted dopant, wherein the spike annealing is performed under NH 3 , H 2 , or N 2 atmosphere at a temperature in the range of 900° C. to 1,100° C. with a heating rate of 100° C./sec to 250° C./sec; forming a device isolation film for isolating an active area and a field area on the semiconductor substrate; forming a gate electrode in which a tunnel oxide film, a floating gate electrode, a dielectric film, and a control gate electrode are deposited on the active area; and performing an ion implantation for forming junctions on the semiconductor substrate in both sides of the gate electrode to form a DDD junction structure.