Patent ID: 8952448
Filing Date: 2015-02-10
Classification: H01L

Abstract:
1. A three-dimensional (3D) nonvolatile memory device, comprising: a vertical stack of nonvolatile memory cells on a substrate having a region of first conductivity type therein; a dopant region of second conductivity type in the substrate, said dopant region forming a P-N rectifying junction with the region of first conductivity type and having a concave upper surface that is recessed relative to an upper surface of the substrate upon which said vertical stack of nonvolatile memory cells extends; and an electrically insulating electrode separating pattern extending through said vertical stack of nonvolatile memory cells and into the recess in said dopant region of second conductivity type, said electrically insulating electrode separating pattern having a width and a bottom surface with a convex shape and a radius of curvature that is greater than one half the width.