Patent ID: 6545312
Filing Date: 2003-04-08
Classification: H01L

Abstract:
A nonvolatile semiconductor memory device having a control gate electrode and a floating gate electrode provided on a semiconductor substrate to have their respective side surfaces in opposed relation, the device comprising:a gate insulating film formed on the semiconductor substrate; the control gate electrode formed on the gate insulating film; a protective insulating film deposited only on that one of the side surfaces of the control gate electrode opposed to the floating gate electrode to protect the control gate electrode during formation of the floating gate electrode; the floating gate electrode opposed to the side surface of the control gate electrode with the protective insulating film interposed therebetween so as to be capacitively coupled to the control gate electrode; a tunnel insulating film formed between the floating gate electrode and the semiconductor substrate; a drain region formed in a region of the semiconductor substrate containing a portion underlying the floating gate electrode; and a source region formed in a region of the semiconductor substrate opposite to the drain region relative to the control gate electrode.