Patent ID: 9431606
Filing Date: 2016-08-30
CPC Classification: H01L

Claim Text:
1. A memory cell, comprising: a pair of electrodes, the electrodes being a first electrode and a second electrode, the first electrode being over the second electrode; first and second switching regions between the electrodes; the first switching region being over the second switching region; the first switching region comprising a first ion buffer layer and a first dielectric layer; the second switching region comprising a second ion buffer layer and a second dielectric layer; wherein the first and second ion buffer layers comprise CuZrAlTeO, where the chemical formula lists primary constituents rather than designating a specific stoichiometry; an ion source region between the first switching region and the first electrode; the second switching region being spaced from the ion source region by the first switching region; wherein the first dielectric layer is thicker than the second dielectric layer; wherein the first and second ion buffer layers comprise first and second concentrations of tellurium, respectively; and wherein the second concentration of tellurium is higher than the first concentration of tellurium; and wherein the first and second ion buffer layers comprise first and second concentrations of aluminum, respectively; and wherein the second concentration of aluminum is lower than the first concentration of aluminum.