Patent ID: 7259433

Claim:
A method of producing a non-volatile semiconductor memory device comprising: a step of forming a plurality of dielectric films containing charge storage layers having a charge holding capability on an active region of a semiconductor; and a step of forming electrodes on said plurality of dielectric films, wherein the step of forming said plurality of dielectric films comprises: a step of forming a first nitride film by chemical vapor deposition using a first gas which contains a first silicon-containing gas containing a chlorine in a predetermined percent composition and a nitrogen-containing gas as a starting material and a step of forming a second nitride film by chemical vapor deposition using a second gas which contains a second silicon-containing gas with a percent composition of chlorine lower than said predetermined percent composition and a nitrogen-containing gas as the starting material, wherein the step of forming electrodes comprises: a step of forming a gate electrode comprised of polycrystalline silicon.