Two-terminal nanotube devices and systems and methods of making same
First Claim
1. A two terminal switching device, comprising:
- a first conductive terminal;
a second conductive terminal in spaced relation to the first conductive terminal;
a nanotube article having a plurality of nanotubes, said nanotube article being arranged such that the nanotube article is in permanent and direct physical contact with both the first and second conductive terminals; and
stimulus circuitry in electrical communication with at least one of the first and second conductive terminals,said stimulus circuitry configured to create a first voltage difference between the first conductive terminal and the second conductive terminal, to induce a change in the resistance of the nanotube article between the first and second conductive terminals from a relatively low resistance to a relatively high resistance,said stimulus circuitry configured to create a second voltage difference between the first conductive terminal and the second conductive terminal, to induce a change in the resistance of the nanotube article between the first and second conductive terminals from a relatively high resistance to a relatively low resistance,wherein the relatively high resistance of the nanotube article between the first and second conductive terminals corresponds to a first state of the two terminal switching device, and wherein the relatively low resistance of the nanotube article between the first and second conductive terminals corresponds to a second state of the two terminal switching device,wherein the first and second states of the two terminal switching device are nonvolatile.
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Accused Products
Abstract
A two terminal switching device includes first and second conductive terminals and a nanotube article. The article has at least one nanotube, and overlaps at least a portion of each of the first and second terminals. The device also includes a stimulus circuit in electrical communication with at least one of the first and second terminals. The circuit is capable of applying first and second electrical stimuli to at least one of the first and second terminal(s) to change the relative resistance of the device between the first and second terminals between a relatively high resistance and a relatively low resistance. The relatively high resistance between the first and second terminals corresponds to a first state of the device, and the relatively low resistance between the first and second terminals corresponds to a second state of the device.
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Citations
59 Claims
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1. A two terminal switching device, comprising:
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a first conductive terminal; a second conductive terminal in spaced relation to the first conductive terminal; a nanotube article having a plurality of nanotubes, said nanotube article being arranged such that the nanotube article is in permanent and direct physical contact with both the first and second conductive terminals; and stimulus circuitry in electrical communication with at least one of the first and second conductive terminals, said stimulus circuitry configured to create a first voltage difference between the first conductive terminal and the second conductive terminal, to induce a change in the resistance of the nanotube article between the first and second conductive terminals from a relatively low resistance to a relatively high resistance, said stimulus circuitry configured to create a second voltage difference between the first conductive terminal and the second conductive terminal, to induce a change in the resistance of the nanotube article between the first and second conductive terminals from a relatively high resistance to a relatively low resistance, wherein the relatively high resistance of the nanotube article between the first and second conductive terminals corresponds to a first state of the two terminal switching device, and wherein the relatively low resistance of the nanotube article between the first and second conductive terminals corresponds to a second state of the two terminal switching device, wherein the first and second states of the two terminal switching device are nonvolatile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A selectable memory cell, comprising:
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a cell selection transistor including a gate, a source, and a drain, with the gate in electrical contact with a word line, and a drain in electrical contact with a bit line; a two-terminal switching device comprising a first conductive terminal, a second conductive terminal, and a nanotube article having a plurality of nanotubes, the nanotube article in permanent and direct physical contact with both the first and second conductive terminals, wherein the first conductive terminal is in electrical contact with the source of the memory cell selection transistor and the second conductive terminal is in electrical contact with a program/erase/read line; and a memory operation circuit in electrical communication with the word line, bit line, and program/erase/read line, said memory operation circuit including circuitry configured to generate and apply a select signal on the word line to select the memory cell and for generating and for applying an erase signal on the program/erase/read line, the erase signal creating a voltage difference between the first conductive terminal and the second conductive terminal and selected to induce a change in the resistance of the nanotube article between the first and second conductive terminals from a relatively low resistance to a relatively high resistance, said memory operation circuit including circuitry configured to generate and apply a select signal on the word line to select the memory cell and for generating and for applying a program signal on the program/erase/read line, the program signal creating a voltage difference between the first conductive terminal and the second conductive terminal and selected to induce a change in the resistance of the nanotube article between the first and second conductive terminals from a relatively high resistance to a relatively low resistance, wherein the relatively high resistance of the nanotube article between the first and second conductive terminals corresponds to a first informational state of the memory cell, and wherein the relatively high resistance of the nanotube article between the first and second conductive terminals corresponds to a second informational state of the memory cell, wherein the first and second informational states are nonvolatile. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59)
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Specification