Patent ID: 8969983
Filing Date: 2015-03-03
Classification: H01L

Abstract:
1. A semiconductor storage device comprising: a semiconductor substrate; a plurality of cell transistors on the semiconductor substrate; a plurality of contact plugs each buried between the adjacent cell transistors, and directly and electrically connected to a diffusion layer between the adjacent cell transistors; an interlayer dielectric film burying gaps between the plurality of the contact plugs; a storage element provided not above the contact plugs but above the interlayer dielectric film; a sidewall film covering at least a part of a side surface of the storage element, and overlapping with one of the contact plugs as viewed from above a surface of the semiconductor substrate; and a lower electrode between a bottom of the storage element and the interlayer dielectric film and between the sidewall film and one of the contact plugs, the lower electrode electrically connecting the storage element to one of the contact plugs, wherein, as the storage element and the lower electrode are viewed from above the surface of the semiconductor substrate, an external edge of the storage element is substantially equal in a shape to an external edge of the lower electrode, and centers of the storage element and the lower electrode substantially match one another.