Patent ID: 9018696
Filing Date: 2015-04-28
Classification: H01L

Abstract:
1. A nonvolatile semiconductor memory device, comprising: a memory cell region and a contact region, the memory cell region including memory strings, each of the memory strings including a plurality of electrically rewritable memory cells connected in series and extending in a first direction, the memory strings including a first memory string, a second memory string, and a third memory string, the first memory string and the second memory string being arranged along a second direction perpendicular to the first direction, the first memory string and the third memory string being arranged along a third direction perpendicular to the first direction and crossing the second direction, the contact region including conductive layers and insulating layers stacked alternately in a stacking direction, the conductive layers including a first conductive layer and a second conductive layer disposed above the first conductive layer, the contact region further including contact electrodes, each of the contact electrodes extending in the stacking direction, the contact electrodes including a first contact electrode and a second contact electrode, the first contact electrode being electrically connected to the first conductive layer and including a first cross-sectional area at a certain height level from a substrate, the second contact electrode being electrically connected to the second conductive layer and including a second cross-sectional area at the certain height level from the substrate, the first cross sectional area being larger than the second cross sectional area.