摘要:
A method is used to make a bit selectable device having nanotube memory elements. A structure having at least two transistors is provided, each with a drain and a source with a defined channel region therebetween, each transistor further including a gate over said channel. A trench is formed between one of the source and drain of a first transistor and one of the source and drain of a second transistor. An electrical communication path is formed in the trench between one of the source and drain of a first transistor and one of the source and drain of a second transistor. A defined pattern of nanotube fabric is provided over at least a horizontal portion of the structure and extending into the trench. An electrode is provided in the trench. A pattern of nanotube fabric is suspended so that at least a portion is vertically suspended in spaced relation to the vertical walls of the trench and positioned so that the vertically suspended defined pattern of nanotube fabric is electromechanically deflectable into electrical communication with one of the drain and source of a first transistor and one of the source and drain of a second transistor.
摘要:
A method of making byte erasable devices having elements made with nanotubes. Under one aspect of the invention, a device is made having nanotube memory elements. A structure is provided having a plurality of transistors, each with a drain and a source with a defined channel region therebetween, each transistor further including a gate over said channel. For a predefined set of transistors, a corresponding trench is formed between gates of adjacent transistors. For each trench, a defined pattern of nanotube fabric is provided over at least a horizontal portion of the structure and extending into the trench. An electrode is provided in each trench. Each defined pattern of nanotube fabric is suspended so that at least a portion is vertically suspended in spaced relation to the vertical walls of the trench and positioned so that the vertically suspended defined pattern of nanotube fabric is electromechanically deflectable into electrical communication with one of the drain and source of a transistor. An electrical communication path is provided electrically connecting each electrode so that all electrodes may electro-statically attract a corresponding defined pattern of nanotube fabric away from a transistor and toward the electrode.
摘要:
Under one aspect, a nonvolatile nanotube diode includes: a substrate; a semiconductor element disposed over the substrate, the semiconductor element having an anode and a cathode and capable of forming an electrically conductive pathway between the anode and the cathode; a nanotube switching element disposed over the semiconductor element, the nanotube switching element including a conductive contact and a nanotube fabric element capable of a plurality of resistance states; and a conductive terminal disposed in spaced relation to the conductive contact, wherein the nanotube fabric element is interposed between and in electrical communication with the conductive contact and the conductive contact is in electrical communication with the cathode, and wherein in response to electrical stimuli applied to the anode and the conductive terminal, the nonvolatile nanotube diode is capable of forming an electrically conductive pathway between the anode and the conductive terminal.
摘要:
Under one aspect, a memory array includes word lines; bit lines; memory cells; and a memory operation circuit. Each memory cell responds to electrical stimulus on a word line and on a bit line and includes: a two-terminal non-volatile nanotube switching device having first and second terminals, a semiconductor diode element, and a nanotube fabric article capable of multiple resistance states. The semiconductor diode and nanotube article are between and in electrical communication with the first and second terminals, which are coupled to the word line bit line respectively. The operation circuit selects cells by activating bit and/or word lines, detects a resistance state of the nanotube fabric article of a selected memory cell, and adjusts electrical stimulus applied to the cell to controllably induce a selected resistance state in the nanotube fabric article. The selected resistance state corresponds to an informational state of the memory cell.
摘要:
Under one aspect, a method of making a nanotube switch includes: providing a substrate having a first conductive terminal; depositing a multilayer nanotube fabric over the first conductive terminal; and depositing a second conductive terminal over the multilayer nanotube fabric, the nanotube fabric having a thickness, density, and composition selected to prevent direct physical and electrical contact between the first and second conductive terminals. In some embodiments, the first and second conductive terminals and the multilayer nanotube fabric are lithographically patterned so as to each have substantially the same lateral dimensions, e.g., to each have a substantially circular or rectangular lateral shape. In some embodiments, the multilayer nanotube fabric has a thickness from 10 nm to 200 nm, e.g., 10 nm to 50 nm. The structure may include an addressable diode provided under the first conductive terminal or deposited over the second terminal.
摘要:
Under one aspect, a non-volatile nanotube switch includes a first terminal; a nanotube block including a multilayer nanotube fabric, at least a portion of which is positioned over and in contact with at least a portion of the first terminal; a second terminal, at least a portion of which is positioned over and in contact with at least a portion of the nanotube block, wherein the nanotube block is constructed and arranged to prevent direct physical and electrical contact between the first and second terminals; and control circuitry capable of applying electrical stimulus to the first and second terminals. The nanotube block can switch between a plurality of electronic states in response to a plurality of electrical stimuli applied by the control circuitry to the first and second terminals. For each different electronic state, the nanotube block provides an electrical pathway of different resistance between the first and second terminals.
摘要:
Under one aspect, a non-volatile nanotube diode device includes first and second terminals; a semiconductor element including a cathode and an anode, and capable of forming a conductive pathway between the cathode and anode in response to electrical stimulus applied to the first conductive terminal; and a nanotube switching element including a nanotube fabric article in electrical communication with the semiconductive element, the nanotube fabric article disposed between and capable of forming a conductive pathway between the semiconductor element and the second terminal, wherein electrical stimuli on the first and second terminals causes a plurality of logic states.
摘要:
An electrostatic discharge (ESD) protection circuit for protecting a protected circuit is coupled to an input pad. The ESD circuit includes a nanotube switch electrically having a control. The switch is coupled to the protected circuit and to a discharge path. The nanotube switch is controllable, in response to electrical stimulation of the control, between a de-activated state and an activated state. The activated state creates a current path so that a signal on the input pad flows to the discharge path to cause the signal at the input pad to remain within a predefined operable range for the protected circuit. The nanotube switch, the input pad, and the protected circuit may be on a semiconductor chip. The nanotube switch may be on a chip carrier. The deactivated and activated states may be volatile or non-volatile depending on the embodiment.
摘要:
Nanotube-based switching elements and logic circuits are disclosed. Under one embodiment of the invention, a Boolean logic circuit includes at least one input terminal and an output terminal, and a network of nanotube switching elements electrically disposed between said at least one input terminal and said output terminal. The network of nanotube switching elements effectuates a Boolean function transformation of Boolean signals on said at least one input terminal. The Boolean function transformation includes a Boolean inversion within the function, such as a NOT or NOR function.
摘要:
Boolean logic circuits comprising nanotube-based switching elements with multiple controls. The Boolean logic circuits include input and output terminals and a network of nanotube switching elements electrically disposed between said at least one input terminal and said output terminal. Each switching element includes an input node, an output node, and a nanotube channel element having at least one electrically conductive nanotube. A control structure is disposed in relation to the nanotube channel element to controllably form and unform an electrically conductive channel along the nanotube channel element. At least one nanotube switching element non-volatilely retains an informational state and at least one nanotube switching elements volatilely retains an informational state. The network of nanotube switching elements effectuates a Boolean function transformation of Boolean signals on said at least one input terminal. Dual rail cascode logic circuits may also be constructed from the nanotube switching elements.