Patent ID: 8946021
Filing Date: 2015-02-03
Classification: H01L

Abstract:
1. A method for manufacturing a nonvolatile semiconductor memory device, comprising: forming a stacked body by alternately stacking a plurality of first films and second films on a substrate, the second films being formed with a material which is different from a material forming the first films; and forming a trench in the stacked body; forming a charge storage film, a tunnel insulating film, and a channel film made of a silicon crystal in this order on an exposed surface of the second films of an inner surface of the trench; and forming a silicon oxide layer at an interface between the tunnel insulating film and the channel film by performing thermal treatment in an oxygen gas atmosphere, 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.