Patent ID: 6597047
Filing Date: 2003-07-22
Classification: H01L

Abstract:
A method for fabricating a nonvolatile semiconductor memory device in which electrons are injected from a drain end or a source end into a floating gate electrode in a method of injecting hot electrons created by a band-to-band tunneling current, comprising the steps of:a) forming a silicon dioxide film on an n-type semiconductor region by performing an annealing process within an ambient containing oxygen and hydrogen, the n-type semiconductor region being located in a substrate; b) diffusing nitrogen into the silicon dioxide film by annealing the silicon dioxide film within an ambient containing nitrogen; c) forming a memory gate electrode section, which includes a floating gate electrode, an interelectrode insulating film and a control gate electrode, on the silicon dioxide film after the step b) has been performed; and d) defining two p-type doped regions by introducing a p-type dopant into two parts of the n-type semiconductor region that are located on right- and left-hand sides of the floating gate electrode.