Patent ID: 9117998
Filing Date: 2015-08-25
Classification: H01L

Abstract:
1. A nonvolatile memory cell comprising: a first electrode, a second electrode, and a programmable region between the first and second electrodes; the first electrode comprising a first current conductive material and a second current conductive material different in composition from the first current conductive material, the first and second current conductive materials being within an opening in a dielectric material, all of the second current conductive material being within the opening in the dielectric material, the second current conductive material having a first portion laterally surrounded by the first current conductive material and a second portion projecting elevationally outward from the first current conductive material and from the first portion, the second portion having vertical sidewalls all of which are within the opening in the dielectric material and having a top surface, the programmable region being directly against the top surface and directly against the vertical sidewalls of the second portion of the projecting second current conductive material; and the second portion of second current conductive material comprising a neck projecting elevationally outward from the first portion, the first portion comprising a pair of second conductive material shoulders that are laterally inward of the first current conductive material.