Patent ID: 8779499
Filing Date: 2014-07-15
Classification: H01L

Abstract:
1. A nonvolatile semiconductor memory device comprising sheet-like memory strings arranged in a matrix shape substantially perpendicularly to a substrate, wherein each of the memory strings includes, in a height direction of a sheet-like semiconductor film, a plurality of memory cells each including a tunnel dielectric film, a floating gate electrode film, an inter-electrode dielectric film, and a control gate electrode film on a first principal plane of the sheet-like semiconductor film, the control gate electrode film includes a common connecting section that connects the control gate electrode films of the memory cells at same height of the memory strings arranged in a first direction and extends in the first direction, and an electrode forming section that is provided for each of the memory cells above or below the floating gate electrode film via the inter-electrode dielectric film to project from the common connecting section in a second direction orthogonal to the first direction, the floating gate electrode film has a shape extending in the second direction and is formed on the first principal plane of the sheet-like semiconductor film via the tunnel dielectric film, and the memory cell has structure in which the floating gate electrode film is held, via the inter-electrode dielectric film, between the electrode forming sections of the upper and lower control gate electrode films.