Patent ID: 8907402
Filing Date: 2014-12-09
Classification: H01L

Abstract:
1. A method for manufacturing a nonvolatile semiconductor memory device including a memory string having series-connected memory cells, the method comprising: forming a first semiconductor layer on a foundation layer; forming a first sacrificial layer having a bottom surface and a side surface, and the bottom surface and the side surface being surrounded with the first semiconductor layer; forming a first insulating layer on the first semiconductor layer and on the first sacrificial layer; forming a stacked body on the first insulating layer, the stacked body including a plurality of electrode layers and a plurality of second sacrificial layers alternately stacked; forming a first trench extending from an upper surface of the stacked body to the first insulating layer on the first sacrificial layer; forming a second insulating layer in the first trench; forming a second trench extending from the upper surface of the stacked body to the first insulating layer; and forming a third insulating layer in the second trench.