Nonvolatile semiconductor memory device

Abstract

A nonvolatile semiconductor memory device includes a semiconductor substrate, a memory cell region which is disposed on the semiconductor substrate and has a transistor array of a stacked gate structure having a floating gate, a Ti-containing barrier which is disposed in an upper layer of the memory cell region and covers the memory cell region, and a passivation layer disposed above the Ti-containing barrier. A method of manufacturing the nonvolatile semiconductor memory device includes forming a memory cell structure on a memory cell region on a semiconductor substrate and forming a necessary element structure in a peripheral circuit region except for the memory cell region on the semiconductor substrate, forming an interlayer insulating layer covering the memory cell structure and the element structure, forming a Ti-containing conductive film on the interlayer insulating layer, and forming a Ti-containing wiring layer in an upper layer of the peripheral circuit region by selectively etching the Ti-containing conductive film and forming a Ti-containing barrier in an upper layer of the memory cell region, the barrier covering the memory cell region.