Patent ID: 7732271
Filing Date: 2010-06-08
Classification: H01L

Abstract:
1. A NAND-type semiconductor storage device manufacturing method, comprising: forming a layer to be removed on a substrate; removing a part of the layer to be removed to expose a part of the substrate; forming a semiconductor layer on the exposed part of the substrate and the layer to be removed; forming a trench which reaches the substrate through the semiconductor layer to expose the layer to be removed on a side wall of the trench; removing the layer exposed on the side wall of the trench to form a cavity; forming a buried insulating film in the cavity; forming an element isolation insulating film in the trench; forming a first insulating film above a region where the buried insulating film is formed; forming a floating gate electrode on the first insulating film; forming a second insulating film on the floating gate electrode; forming a control electrode on the second insulating film; and forming a pair of diffusion layers in the semiconductor layer to have the floating gate electrode between the pair of diffusion layers.