Chalcogenide memory device components and composition
View Patent ↗Systems, devices, and methods related to or that employ chalcogenide memory components and compositions are described. A memory device, such as a selector device, may be made of a chalcogenide material composition. A chalcogenide material may have a composition that includes one or more elements from the boron group, such as boron, aluminum, gallium, indium, or thallium. A selector device, for instance, may have a composition of selenium, arsenic, and at least one of boron, aluminum, gallium, indium, or thallium. The selector device may also be composed of germanium or silicon, or both. The relative amount of boron, aluminum, gallium, indium, or thallium may affect a threshold voltage of a memory component, and the relative amount may be selected accordingly. A memory component may, for instance have a composition that includes selenium, arsenic, and some combination of germanium, silicon, and at least one of boron, aluminum, gallium, indium, or thallium.
1. An apparatus, comprising:
a memory element;
a selector device coupled with the memory element, wherein the selector device has a composition comprising:
selenium in an amount greater than or equal to 40% by weight, relative to a total weight of the composition;
arsenic in an amount ranging from 10% to 35% by weight, relative to the total weight of the composition; and
at least one element selected from a group consisting of boron, aluminum, gallium, indium, and thallium in an amount ranging from 0.15% to 35% by weight, relative to the total weight of the composition.
2. The apparatus of claim 1 , wherein the composition of the selector device comprises:
germanium in an amount ranging from 1% to 20% by weight, relative to the total weight of the composition.
3. The apparatus of claim 2 , wherein the composition of the selector device comprises:
silicon, wherein a combination of the silicon, the germanium, and the at least one element selected from the group consisting of boron, aluminum, gallium, indium, and thallium is an amount greater than or equal to 20% by weight, relative to the total weight of the composition.
4. The apparatus of claim 1 , wherein the composition of the selector device comprises:
silicon in an amount ranging from 1% to 15% by weight, relative to the total weight of the composition.
5. A apparatus, comprising:
a first access line;
a second access line; and
a memory cell that includes a first chalcogenide material comprising a composition of selenium, arsenic, and at least one of boron, aluminum, gallium, indium, or thallium, wherein the first access line is in electronic communication with the second access line via the memory cell, wherein the composition of the first chalcogenide material comprises:
the selenium in an amount greater than or equal to 40% by weight, relative to a total weight of the composition;
the arsenic in an amount ranging from 10% to 35% by weight, relative to the total weight of the composition; and
the at least one of boron, aluminum, gallium, indium, or thallium in an amount ranging from 0.15% to 35% by weight, relative to the total weight of the composition.
6. The apparatus of claim 5 , wherein the composition of the first chalcogenide material comprises:
germanium in an amount ranging from 1% to 20% by weight, relative to the total weight of the composition.
7. The apparatus of claim 5 , wherein the composition of the first chalcogenide material comprises:
silicon in an amount ranging from 1% to 15% by weight, relative to the total weight of the composition.
8. The apparatus of claim 5 , wherein the memory cell comprises a self-selecting memory device.
9. The apparatus of claim 5 , wherein the memory cell comprises:
a selector device that comprises the first chalcogenide material; and
a memory element that comprises a different composition than the selector device.
10. The apparatus of claim 9 , wherein the selector device and the memory element are arranged in a series configuration between the first access line and the second access line.
11. The apparatus of claim 9 , wherein the memory element comprises a second chalcogenide material having a different composition than the first chalcogenide material.
12. The apparatus of claim 9 , wherein the memory element comprises a ferroelectric capacitor.
13. The apparatus of claim 9 , wherein the memory element comprises a memristor.
14. An apparatus, comprising:
a plurality of memory cells each having a memory element and a selector device, wherein each selector device comprises a chalcogenide material having a composition of selenium, arsenic, and at least one of boron, aluminum, gallium, indium, or thallium; and
a plurality of access lines arranged in a three-dimensional cross-point configuration and in electronic communication with the plurality of memory cells, wherein the composition of the chalcogenide material comprises a combination of silicon, germanium, and the at least one of the boron, aluminum, gallium, indium, or thallium in an amount greater than or equal to 20% by weight, relative to a total weight of the composition.