Nanoscale switching device
AssigneeHewlett-Packard Development Company, L.P.
InventorsJianhua Yang, Matthew Pickett, Gilberto Ribeiro
Life of this patent
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Abstract
A nanoscale switching device has an active region disposed between two electrodes of nanoscale widths. The active region contains a switching material that carries mobile ionic dopants capable of being transported over the active region under an electric field to change a resistive state of the device. The switching material further carries immobile ionic dopants for inhibiting clustering of the mobile ionic dopants caused by switching cycles of the device. The immobile ionic dopants have a charge opposite in polarity to the charge of the mobile ionic dopants, and are less mobile under the electric field than the mobile ion dopants.
Claims20
A nanoscale switching device comprising:
- a first electrode of a nanoscale width;
- a second electrode of a nanoscale width;
- and
- an active region disposed between the first and second electrodes, the active region containing a switching material carrying mobile ionic dopants and immobile ionic dopants, the mobile ionic dopants being of a first charge polarity and capable of being transported through the switching material under an electric field to change a resistive state of the nanoscale switching device, the immobile ionic dopants being of a second charge polarity opposite to the first charge polarity and being less mobile than the mobile ionic dopants under the electric field, wherein the immobile ionic dopants inhibit clustering of the mobile ionic dopants in the active region caused by switching cycles of the nanoscale switching device.
A nanoscale crossbar array comprising:
- a first group of conductive nanowires running in a first direction;
- a second group of conductive nanowires running in a second direction and intersecting the first group of nanowires;
- and
- a plurality of switching devices formed at intersections of the first group of nanowires with the second group of nanowires, each switching device having a first electrode formed by a first nanowire of the first group and a second electrode formed by a second nanowire of the second group, and an active region disposed at the intersection between the first and second electrodes, the active region containing a switching material carrying mobile ionic dopants and immobile ionic dopants, the mobile ionic dopants being of a first charge polarity and capable of being transported through the switching material under an electrical field to change a resistive state of the switching device, the immobile ionic dopants being of a second charge polarity opposite to the first charge polarity and being less mobile than the mobile ionic dopants under the electric field, wherein the immobile ionic dopants inhibit clustering of the mobile ionic dopants in the active region caused by switching cycles of the switching device.
A nanoscale switching device comprising:
- a first electrode;
- a second electrode;
- and
- an active region disposed between the first and second electrodes, the active region containing a switching material having therein a first ionic dopant and a second, different ionic dopant,
- the first ionic dopant being a mobile dopant of a first charge polarity so as to move through the switching material in response to application of an electric field to change a resistive state of the nanoscale switching device,
- the second ionic dopant being of a second charge polarity opposite to the first charge polarity and being less mobile than the first ionic dopant under the electric field,
- wherein the second ionic dopant inhibits clustering of the first ionic dopant in the active region caused by switching cycles of the nanoscale switching device.
Dependencies are inferred from the claim text.