Patent ID: 7808810
Filing Date: 2010-10-05
Classification: G11C,H01L

Abstract:
1. A nonvolatile memory array comprising a first plurality of memory cells, each memory cell of the first plurality comprising: a dielectric rupture antifuse; a resistance-switching memory element comprising a layer of a resistivity-switching metal oxide compound, the compound including only one metal, and a metal additive disposed in the compound, wherein the metal additive is selected from the group consisting of cobalt, aluminum, gallium, indium, and boron, and comprises about 0.01 and about 5 percent of the metal atoms in the layer of the compound; wherein the array comprises: a) a first memory cell storing a first data state, wherein the antifuse of the first cell is unruptured and the resistance-switching memory element of the first cell is in a high-resistivity state; b) a second memory cell storing a second data state, wherein the antifuse of the second cell is ruptured and the resistivity-switching memory element of the second cell is in a low-resistivity state; and c) a third memory cell storing a third data state, wherein the antifuse of the third memory cell is ruptured and the resistivity-switching memory element of the third cell is in a high-resistivity state.