Patent ID: 6207503
Filing Date: 2001-03-27
Classification: H01L

Abstract:
A method of forming split gate electrode MOSFET devices including the steps comprising:form a tunnel oxide layer over a semiconductor substrate,form a floating gate electrode layer composed of polysilicon over said tunnel oxide layer,form a masking cap comprising a hard mask composed of polysilicon oxide over said floating gate electrode layer,pattern a floating gate electrode stack formed by said tunnel oxide layer and said floating gate electrode layer in said pattern of said masking cap using said masking cap as a hard mask,form intermetal dielectric and control gate layers over said substrate covering said said masking cap and said stack and locations for future source regions and locations for future drain regions,pattern said intermetal dielectric and control gate layers into forming a control gate set covering said masking cap, and said stack, with a portion of said set remaining on said semiconductor substrate beyond the floating gate electrode stack to prepare for the formation of mirror image split gate electrodes,etch a source line slot bisecting and extending through said set, said masking cap, and said stack to form a mirror image split gate electrode pair and stacks pairs,form a source region by ion implanting through said source line slot through said gate electrode stack including said floating gate electrode and said tunnel oxide layer, andform a drain region self-aligned with said split gate electrodes.