Patent ID: 9620515
Date: 2017-04-11
CPC Classifications: H01L

Claim:
1. A semiconductor memory device comprising: a semiconductor pillar extending in a first direction in a first region; a first electrode film provided on a second direction side of the semiconductor pillar and extending in a third direction in the first region and in a second region adjacent to the first region in the third direction, the second direction being different from the first direction, the third direction being different from the first direction and the second direction; a second electrode film provided between the semiconductor pillar and the first electrode film in the first region; a first insulating film provided between the semiconductor pillar and the second electrode film; a second insulating film provided between the second electrode film and the first electrode film; a third insulating film provided between the second insulating film and the first electrode film; a fourth insulating film provided between the third insulating film and the first electrode film; and a contact provided in the second region and connected to the first electrode film, a film thickness in the first direction of the first electrode film in the first region being smaller than a film thickness in the first direction of the first electrode film in the second region.