Abstract:
A device (1) having a semiconductor junction whose electrical charge volume is controlled by a ferroelectric element (5). The ferroelectric (5) establishes the level of leakage of the pn junction to provide a gate-controlled diode or transistor device. The bipolar three-terminal gated diode may be used in memory matrices, neural synaptic networks, DRAM units, bipolar transistors, JFETs, and gallium arsenide and AlGaAs heterostructures.
Abstract:
The invention relates to a memory cell (10) comprising at least one binary memory area for storing an item of bit information and to a method for storing an item of bit information. According to the invention, it is provided that the memory area (SB), e.g. a quantum dot layer of In(Ga)As quantum dots, can optionally store holes or electrons and allows a recombination of holes and electrons, the charge carrier type of the charge carriers stored in the memory area defines the bit information of the memory area and a charge carrier injection device (PN) is present, by means of which optionally holes or electrons can be injected into the memory area (SB) and the bit information can thus be changed. The holes and electrons come from a hole reservoir (LR) or electron reservoir (ER) which consist e.g. of p-doped or n-doped GaAs. The readout layer (AS) is a two-dimensional hole or electron gas layer.
Abstract:
An embodiment of the invention relates to a memory comprising a strained double-heterostructure (110) having an inner semiconductor layer (115) which is sandwiched between two outer semiconductor layers, (120, 125) wherein the lattice constant of the inner semiconductor layer differs from the lattice constants of the outer semiconductor layers, the resulting lattice strain in the double-heterostructure inducing the formation of at least one quantum dot inside the inner semiconductor layer, said at least one quantum dot being capable of storing charge carriers therein, and wherein, due to the lattice strain, the at least one quantum dot has an emission barrier (Eb) of 1,15 eV or higher, and provides an energy state density of at least three energy states per 1000 nm3, all said at least three energy states (186) being located in an energy band (DeltaWb) of 50 meV or less.
Abstract:
A memory cell (10) for storing one or more bits of information has a control gate (24), a source terminal (12) and a drain terminal (14). A semiconductor substrate (16) is located between the source (12) and drain (14) terminals, and a floating gate (26) is disposed between the control gate (24) and the semiconductor substrate (16). The floating gate (26) is electrically isolated from the control gate (24) by a charge trapping barrier (30), and is electrically isolated from the semiconductor substrate (16) by a charge blocking barrier (28). At least one of the charge trapping barrier (30) and the charge blocking barrier (28) contains a III-V semiconductor material. The charge trapping barrier (30) is adapted to enable the selective passage of charge carriers between the control gate (24) and the floating gate (26), in use, to modify the one or more bits of information stored by the memory cell (10).
Abstract:
Die Erfindung bezieht sich u. a. auf eine Speicherzelle (10) mit mindestens einem binären Speicherbereich zum Speichern einer Bitinformation. Erfindungsgemäß ist vorgesehen, dass der Speicherbereich (SB) wahlweise Löcher oder Elektronen speichern kann und eine Rekombination von Löchern und Elektronen erlaubt, die Ladungsträgerart der in dem Speicherbereich gespeicherten Ladungsträger die Bitinformation des Speicherbereichs festlegt und eine Ladungsträgerinjektionsvorrichtung (PN) vorhanden ist, mit der wahlweise Löcher oder Elektronen in den Speicherbereich (SB) injiziert werden können und somit die Bitinformation geändert werden kann.
Abstract:
The present invention provides a nanostructured memory device comprising at least one semiconductor nanowire (3) forming a current transport channel, one or more shell layers (4) arranged around at least a portion of the nanowire (3), and nano-sized charge trapping centres (10) embedded in said one or more shell layers (4), and one or more gate electrodes (14) arranged around at least a respective portion of said one or more shell layers (4). Preferably said one or more shell layers (4) are made of a wide band gap material or an insulator. The charge trapping centres (10) may be charged /written by using said one or more gate electrodes (14) and a change in an amount of charge stored in one or more of the charge trapping centres (10) alters the conductivity of the nanowire (3).