Patent ID: 9515261
Filing Date: 2016-12-06
CPC Classification: H01L

Claim Text:
1. A method of forming a memory cell, comprising: forming a data storage region over a first conductive structure, the data storage region comprising at least two different metal oxides having an interface therebetween; forming a second conductive structure over the data storage region; wherein the data storage region is configured to support a filament which provides resistive properties of the memory cell associated with a memory state, the data storage region having a thickness from a surface of the first conductive structure to a surface of the second conductive structure, the metal oxides extending entirely through said thickness; wherein the data storage region comprises multiple portions which are physically different from one another so that at least one of the portions supports a higher resistance segment of said filament and at least one other of the portions supports a lower resistance segment of said filament; wherein the memory cell is formed to have two or more lower resistance segments of said filament, or to have two or more higher resistance segments of said filament; and wherein at least one of the two or more segments of the filament has a substantially different resistance than another of said two or more segments.