Patent ID: 6828619
Filing Date: 2004-12-07
Classification: H01L

Abstract:
A nonvolatile semiconductor storage device comprising:a semiconductor substrate; a gate electrode formed on a surface of said semiconductor substrate; a first control electrode and a second control gate electrode formed on the surface of said semiconductor substrate; and a first diffusion layer and a second diffusion layer formed in the surface of said semiconductor substrate on opposite sides of a set of said first control gate electrode, said gate electrode and said second control gate electrode disposed in this order, a channel region being formed between said first and second diffusion layers, wherein a first insulating layer, isolated pieces of material and a second insulating layer are formed in order in a multilayer structure between said first control gate electrode and the surface of said semiconductor substrate and between said second control gate electrode and the surface of said semiconductor substrate, a third insulating layer being formed between said gate electrode and the surface of said semiconductor substrate, and wherein said first control gate electrode, said gate electrode and said second control gate electrode are electrically connected to each other.