Patent ID: 8253187
Filing Date: 2012-08-28
Classification: H01L

Abstract:
1. A non-volatile semiconductor storage device comprising: a plurality of memory strings with a plurality of electrically rewritable memory cells connected in series; and a plurality of first selection transistors each connected to one end of the respective memory string, each of the memory strings including a columnar semiconductor extending in a perpendicular direction with respect to a substrate, a charge accumulation layer formed around the columnar semiconductor via an insulating film, and conductive layers contacting the columnar semiconductor via the insulating film and the charge accumulation layer to configure the memory cells, and each of the first selection transistors including a first selection gate line formed around the columnar semiconductor via a first gate insulating film to function as a gate electrode of the first selection transistor, the first selection gate lines being arranged at a first height position in the perpendicular direction and at a second height position located higher than the first height position, alternately, the first selection gate lines at the first height position being arranged with a first interval with a certain pitch in a direction parallel to the substrate, and the first selection gate lines at the second height position being arranged on a first interlayer insulating film residing in the first interval.