Patent ID: 6833582
Filing Date: 2004-12-21
Classification: G11C,H01L

Abstract:
A nonvolatile semiconductor memory device, comprising:(a) first and second semiconductor regions formed in a semiconductor substrate; (b) first and second gate electrodes located near said semiconductor substrate between said first and second semiconductor regions; (c) a first insulator film formed between said first gate electrode and said semiconductor substrate; and (d) a second insulator film formed between said second gate electrode and said semiconductor substrate; (e) wherein said second insulator film comprises a potential barrier film formed on said semiconductor substrate and a charge trapping film formed on said potential barrier film; and wherein said charge trapping film comprises a silicon oxynitride film and a third insulator film in which the sum of the energy between a vacuum level and a conduction band of said third insulator film and a band gap of said third insulator film is smaller than that of said silicon oxynitride film; and wherein the product of a charge trap density and a film thickness of said silicon oxynitride film is larger than that of said third insulator film.