Patent ID: 6583008
Filing Date: 2003-06-24
Classification: H01L

Abstract:
A method of manufacturing a nonvolatile semiconductor memory device, the method comprising the steps of:forming a plurality of device isolation regions on a semiconductor substrate; forming a gate insulating layer on the entire surface of the semiconductor substrate; forming a floating gate electrode material on the entire surface of the resulting material; forming a photoresist pattern on the floating gate electrode material so that a portion of the floating gate electrode material overlying the device isolation region is exposed; performing a first etch on the floating gate electrode material to a depth, using the photoresist pattern as an etching mask; forming polymer spacers on etched sidewalls of the photoresist pattern and the floating gate electrode material; and performing a second etch on the floating gate electrode material so that the floating gate electrode material is separated, using the photoresist pattern and the polymer spacers as an etching mask.