Patent ID: 6582998
Filing Date: 2003-06-24
Classification: H01L

Abstract:
A method for fabricating a nonvolatile semiconductor memory device, the method comprising the steps of:a) forming a tunnel insulating film on a substrate and then selectively forming a floating gate electrode on the tunnel insulating film; b) forming a first passivation film on first and second regions of the substrate, the first and second regions being located below the floating gate electrode to horizontally sandwich the floating gate electrode therebetween; c) implanting ions of a first dopant into the substrate through the first passivation film with second region masked, thereby defining a doped region in the first region so that the doped region reaches a third region of the substrate, the third region being located around an end of the first region; d) removing the first passivation film and then forming a second passivation film on the first and second regions, said first dopant in the doped region not being actuated during formation of said second passivation film; and e) annealing the substrate, on which the second passivation film has been formed, in an inert gas ambient, thereby activating the first dopant in the doped region.