Select device for memory cell applications
View Patent ↗The present disclosure includes select devices and methods of using select device for memory cell applications. An example select device includes a first electrode having a particular geometry, a semiconductor material formed on the first electrode and a second electrode having the particular geometry with formed on the semiconductor material, wherein the select device is configured to snap between resistive states in response to signals that are applied to the select device.
1. A memory cell, comprising:
a select device including:
a first electrode having a particular geometry;
a first heater formed on the first electrode;
a semiconductor material formed on the first heater;
a second heater formed on the semiconductor material; and
a second electrode having the particular geometry formed on the second heater; and
a storage element coupled in series to the select device.
2. The memory cell of claim 1 , wherein a width of the semiconductor material is less than approximately 20 nanometers.
3. The memory cell of claim 1 , wherein a width of the particular geometry is based on an operating voltage associated with the memory cell.
4. The memory cell of claim 1 , wherein a composition of the semiconductor material is based on an operating voltage associated with the memory cell.
5. The memory cell of claim 1 , wherein the select device is configured to support bi-directional current flow therethrough.
6. The memory cell of claim 1 , wherein the particular geometry is a circular geometry.
7. The memory cell of claim 1 , wherein the particular geometry is a quasi-square geometry.
8. A memory cell, comprising:
a select device including:
a first heater;
a first electrode on the first heater;
a semiconductor material on the first electrode;
a second electrode on the semiconductor material; and
a second heater on the second electrode; and
a storage element coupled in series to the select device.
9. The memory cell of claim 8 , wherein a vacuum is between the select device and an adjacent select device of an array.
10. The memory cell of claim 8 , wherein the first and second electrodes include an optical absorber.
11. The memory cell of claim 8 , wherein first electrode includes a first laminate portion that includes a metal and a resistive material.
12. The memory cell of claim 8 , wherein the first heater is a metal.
13. A memory cell, comprising:
a select device including:
a first electrode and a second electrode;
a first heater and a second heater, wherein the first heater is coupled to the first electrode and the second heater is coupled to the second electrode; and
a semiconductor material between the first and second electrodes, wherein the first heater and first electrode are adjacent to a first surface of the semiconductor material and the second heater and second electrode are adjacent to a second surface of the semiconductor material; and
a storage element coupled in series to the select device.
14. The memory cell of claim 13 , wherein the select device is configured to:
snap from a first resistive state to a second resistive state in response to providing a first signal provided thereto, wherein the first signal is greater than a threshold voltage; and
remain in the first resistive state in response to a second signal provided thereto, wherein the second signal is less than the threshold voltage.
15. The memory cell of claim 14 , wherein a first current density is provided to the storage element in response to the select device snapping from the first resistive state to the second resistive state; and
a second current density is provided to the storage element in response to the select device remaining in the first resistive state.
16. The memory cell of claim 15 , wherein the first current density is greater than 1 MA/cm 2 and the second current density is less than or equal to 1 MA/cm 2 .
17. The memory cell of claim 14 , wherein the select device is configured to snap from the second resistive state to the first resistive state in response to removing the first signal.
18. The memory cell of claim 13 , wherein the method includes forming the select device such that the select device reaches a temperature greater than 600° C. in response to providing the first signal to the select device.
19. The memory cell of claim 13 , wherein the select device is configured to:
snap from a first resistive state to a second resistive state in response to reaching a threshold temperature greater than 600° C.; and
the select device is configured to repeatedly reach the threshold temperature.
20. The memory cell of claim 14 , wherein the threshold voltage is approximately 2.5 V.