Patent ID: 7875493
Filing Date: 2011-01-25
Classification: H01L

Abstract:
1. A method for making a memory cell device comprising: providing a subassembly comprising a memory cell access layer and a first dielectric material over the memory cell access layer, the memory cell access layer comprising an electrical contact; forming an opening through the first dielectric material to expose the electrical contact; depositing a first memory material into the opening to form a first memory material layer in electrical contact with the electrical contact; depositing a second dielectric material into the opening in a manner to create a void therein; etching the second dielectric material within the opening to create an etched opening, the etched opening comprising a larger, upper open region and a smaller, constricted lower open region, the constricted lower open region being adjacent to the first memory material layer; depositing a second memory material into the opening to create a memory material structure by: forming a top electrode in electrical contact with the upper memory material portion.