Patent ID: 8692311

Claim:
A method for manufacturing a semiconductor device, comprising: selectively implanting an impurity into an underlying layer containing silicon using a mask to form a boron-added region and a region adjacent to the boron-added region, the boron-added region containing boron, a boron concentration of the region adjacent to the boron-added region being lower than a boron concentration in the boron added region; forming a stacked body including a plurality of layers of electrode layers on the underlying layer; forming a pair of holes reaching the region adjacent to the boron-added region in the stacked body; forming a depression part connected to a lower end of each of the pair of holes in the underlying layer by removing the region adjacent to the boron-added region through the holes using an etching solution; forming an insulating film including a charge storage film on a side wall of the holes and on an inner wall of the depression part; and forming a channel body inside the insulating film.