Abstract:
An anti-fuse device includes a first electrode, an insulator on the first electrode, a second electrode on the insulator, and selector logic coupled to the second electrode. The device also includes a conductive path between the first and second electrodes. The conductive path may be configured to provide a hard breakdown for one-time programmable non-volatile data storage.
Abstract:
A nonvolatile memory cell includes a layer (118) of a resistivity-switching metal oxide or nitride compound, the metal oxide or nitride compound including one metal, and a dielectric rupture antifuse (117) formed in series. The dielectric rupture antifuse may be either in its initial, non-conductive state or a ruptured, conductive state. The resistivity-switching metal oxide or nitride layer can be in a higher- or lower-resistivity state. By using both the state of the resistivity- switching layer and the antifuse to store data, more than two bits can be stored per memory cell.
Abstract:
A very high density field programmable memory is disclosed. An array is formed vertically above a substrate using several layers (51a1, 51a2, 51b2), each layer (51a1) of which includes vertically fabricated memory cells. The cell in an N level array may be formed with N+1 masking steps plus masking steps needed for contacts. Maximum use of self alignment techniques minimizes photolithographic limitations. In one embodiment the peripheral circuits are formed in a silicon substrate and an N level array is fabricated above the substrate.
Abstract:
A read-only memory is made electrically addressable over a passive conductor matrix, wherein the volume between intersection of two conductors (2; 4) in the matrix defines a memory cell (5). Data are stored as impedance values in the memory cells. The memory cells (5) comprise either an isolating material (6) which provides high impedance or one or more inorganic or organic semiconductors (9), preferably with an anisotropic conducting property. The semiconductor material (9) forms a diode junction at the interface to a metallic conductor (2; 4) in the matrix. By suitable arrangement of respectively the isolating material (6) and semiconductor material (9) in the memory cells these may be given a determined impedance value which may be read electrically and corresponds to logical values in a binary or multi-valued code. One or more read-only memories (ROM) may be provided on a semiconductor substrate (1) which also comprises driver and control circuits (13), to accomplish a read-only memory device. The device may be realized either planar or also volumetrically by stacking several read-only memories (ROM) in horizontal layers (15) and connecting them with the substrate (1) via addressing buses.
Abstract:
A method for decoding a plurality of flash memory cells which are error-correction-coded as a unit, the method comprising providing a hard-decoding success indication indicating whether or not hard-decoding is at least likely to be successful; and soft-decoding the plurality of flash memory cells at a first resolution only if the hard-decoding success indication indicates that the hard-decoding is not at least likely to be successful.
Abstract:
A nonvolatile memory device includes at least one nonvolatile memory cell which comprises a silicon, germanium or silicon-germanium diode which is doped with at least one of carbon or nitrogen in a concentration greater than an unavoidable impurity level concentration.
Abstract:
A mixed-use memory array with different data states and a method for use therewith are disclosed. In one preferred embodiment, a memory array is provided comprising a plurality of memory cells, each memory cell comprising a memory element comprising a switchable resistance material configurable to one of at least three resistivity states. A first set of memory cells uses X resistivity states to represent X respective data states, and a second set of memory cells uses Y resistivity states to represent Y respective data states, wherein X≠Y.
Abstract:
A patterned polysilicon gate (18) is over a metal layer (16) that is over a gate dielectric layer (14), which in turn is over a semiconductor substrate (12). A thin layer (20) of material is conformally deposited over the polysilicon gate (18) and the exposed metal layer (16) and then etched back to form a sidewall spacer (22) on the polysilicon gate (18) and to re-expose the previously exposed portion of the metal layer (16). The re-exposed metal layer (16) is etched using an etchant that is selective to the gate dielectric material and the sidewall spacer (22). Even though this etch is substantially anisotropic, it has an isotropic component that would etch the sidewall of the polysilicon gate (18) but for the protection provided by the sidewall spacer (22). After the re-exposed metal (16) has been removed, a transistor is formed in which the metal layer (14,24) sets the work function of the gate of the transistor.
Abstract:
A patterned polysilicon gate (18) is over a metal layer (16) that is over a gate dielectric layer (14), which in turn is over a semiconductor substrate (12). A thin layer (20) of material is conformally deposited over the polysilicon gate (18) and the exposed metal layer (16) and then etched back to form a sidewall spacer (22) on the polysilicon gate (18) and to re-expose the previously exposed portion of the metal layer (16). The re-exposed metal layer (16) is etched using an etchant that is selective to the gate dielectric material and the sidewall spacer (22). Even though this etch is substantially anisotropic, it has an isotropic component that would etch the sidewall of the polysilicon gate (18) but for the protection provided by the sidewall spacer (22). After the re-exposed metal (16) has been removed, a transistor is formed in which the metal layer (14,24) sets the work function of the gate of the transistor.
Abstract:
An array of NROM flash memory cells configured to store at least two bits per four F 2 . Split vertical channels are generated along each side of adjacent pillars. A single control gate is formed over the pillars and in the trench between the pillars. The split channels can be connected by an n+ region at the bottom of the trench or the channel wrapping around the trench bottom. Each gate insulator is capable of storing a charge that is adequately separated from the other charge storage area due to the increased channel length.