Patent ID: 8373222
Filing Date: 2013-02-12
Classification: H01L

Abstract:
1. A nonvolatile semiconductor memory device, comprising: a substrate; a stacked body provided on the substrate and including alternately stacked pluralities of isolation dielectric films and electrode films, a through-hole being formed in the stacked body to extend in the stacking direction; a semiconductor pillar buried in the through-hole; and a charge storage layer provided between the electrode films and the semiconductor pillar, the isolation dielectric film including: a first high density film; a low density film provided on the first high density film, the low density film being less dense than the first high density film; and a second high density film provided on the low density film, the second high density film being denser than the low density film, and the electrode film protruding further than the isolation dielectric film toward the semiconductor pillar at an inner face of the through-hole, an end face of the isolation dielectric film having a curved shape displacing toward the semiconductor pillar side as the electrode film is approached.