Patent ID: 8900984

Claim:
A method for manufacturing a nonvolatile semiconductor memory device, the device including a substrate; a stacked structural body provided on a major surface of the substrate, the stacked structural body including a plurality of electrode films stacked alternately with a plurality of insulating films in a first direction perpendicular to the major surface; a semiconductor pillar piercing the stacked structural body in the first direction; and a memory unit provided at an intersection between the semiconductor pillar and each of the electrode films, the method comprising: forming the stacked structural body on the major surface of the substrate, the stacked structural body including the plurality of electrode films stacked alternately with the plurality of inter-electrode insulating films; making a through-hole to pierce the stacked structural body in the first direction; forming the semiconductor pillar by filling a semiconductor into the through-hole; and forming the memory unit at the intersection between the semiconductor pillar and each of the electrode films, the forming of the stacked structural body including: forming at least one film selected from the electrode film and the inter-electrode insulating film in a first region; and forming the at least one film in a second region having a distance to the substrate greater than a distance from the first region to the substrate, an etching rate of the at least one film in the second region being slower than an etching rate of the at least one film in the first region, wherein: the forming in the first region includes forming the electrode film in the first region; the forming in the second region includes forming the electrode film in the second region; and a concentration of an impurity included in the electrode film formed in the first region is different from a concentration of an impurity included in the electrode film formed in the second region.