Patent ID: 8796661
Filing Date: 2014-08-05
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 being narrower than the first portion and having sidewalls, a top surface of the first portion of the second current conductive material being coplanar with a top surface of the first current conductive material, the programmable region contacting a top surface and the sidewalls of the second portion of the 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.