Patent ID: 7927953
Filing Date: 2011-04-19
Classification: H01L

Abstract:
1. A method for manufacturing a nonvolatile semiconductor memory device, comprising: forming a charge storage film, a tunnel insulating film, and a channel film made of a silicon crystal in this order on a gate electrode; forming a silicon oxynitride layer at an interface between the tunnel insulating film and the channel film by performing thermal treatment in a nitrogen monoxide gas atmosphere; forming a stacked body by alternately stacking a plurality of interlayer insulating films and the gate electrodes on a substrate; forming a trench in the stacked body, the charge storage film, the tunnel insulating film, and the channel film being formed on an inner surface of the trench, and a cavity being formed in the trench when the thermal treatment is performed, the cavity communicating with outside of the trench, and the channel film being exposed to an inner surface of the cavity.