Patent ID: 7781824
Filing Date: 2010-08-24
Classification: H01L

Abstract:
1. A memory cell of a nonvolatile semiconductor memory comprising: source/drain diffusion layers formed separately on a surface part of a semiconductor substrate; a first insulating film whose principal constituent elements are Si, O and N, formed on a channel between the source/drain diffusion layers; a charge storage layer whose principal constituent elements are Hf, O and N, formed on the first insulating film; a second insulating film having dielectric constant higher than that of the first insulating film and formed on the charge storage layer; and a control gate electrode formed on the second insulating film, wherein when a composition of the first insulating film is defined as (SiO correlation between a compositional ratio x of the first insulating film and a compositional ratio y of the charge storage layer meets: and, in the case where trap energy levels due to oxygen vacancies in a hafnium oxide film and a hafnium nitride film are represented by E