摘要:
Chalcogenide materials conventionally used in chalcogenide memory devices and ovonic threshold switches may exhibit a tendency called drift, wherein threshold voltage or resistance changes with time. By providing a compensating material which exhibits an opposing tendency, the drift may be compensated. The compensating material may be mixed into a chalcogenide, may be layered with chalcogenide, may be provided with a heater, or may be provided as part of an electrode in some embodiments. Both chalcogenide and non-chalcogenide compensating materials may be used.
摘要:
A device consists a disordered relaxation insulator or/and a polyamorphous solid between two or more electrodes. Invented devices can perform passive, logic and memory functions in an electronic integrated circuit.
摘要:
A multilevel phase change memory cell may have a plurality of intermediate levels between a set and a reset or a crystalline and amorphous states. These intermediate levels between set and reset may be differentiated not only by programming current, but also by different programming pulse widths. As a result, the intermediate states may be positioned, on the programming current versus programming pulse width curve, in regions of common resistance with a relatively large range of programming current.
摘要:
A semiconductor device with S-type negative differential resistance (e.g., phase change memory or threshold switch) may be formed with an asymmetric i-v curve. The asymmetric nature may be achieved by using a lower electrode formed of a semiconductor material such as doped amorphous or polycrystalline semiconductor. The resulting device may have a threshold voltage and leakage current that depend on the polarity of the applied electrical signal. In some embodiments, an ovonic threshold switch with an asymmetric i-v curve may be combined with an ovonic memory cell with an asymmetric i-v curve.
摘要:
Chalcogenide materials conventionally used in chalcogenide memory devices and ovonic threshold switches may exhibit a tendency called drift, wherein threshold voltage or resistance changes with time. By providing a compensating material which exhibits an opposing tendency, the drift may be compensated. The compensating material may be mixed into a chalcogenide, may be layered with chalcogenide, may be provided with a heater, or may be provided as part of an electrode in some embodiments. Both chalcogenide and non-chalcogenide compensating materials may be used.
摘要:
A method of programming a phase-change memory (PCM) device to the high resistance reset state by means of pressure-induced amorphization. A train of few short bipolar current pulses is applied to the PCM device in order to stress phase-change alloy (PCA) under high pressure, and current in each pulse is almost equal to set current. An atomic structure of phase-change alloy is easily deformable by external pressure due to weak chemical bonds. Some materials mechanically contacted PCA in PCM have lower coefficients of thermal expansion and compressibility as well as higher coefficient of hardness than the corresponding coefficients of the PCA.
摘要:
Disturb from the reset to the set state may be reduced by creating an amorphous phase that is substantially free of crystal nuclei when programming the reset state in a phase change memory. In some embodiments, this can be achieved by using a current or a voltage to program that exceeds the threshold voltage of the phase change memory element, but does not exceed a safe current voltage which would cause a disturb.
摘要:
A pulse coupled with a microwave field is used for programming a resistive memory into one of non-volatile states. As the result, the programming becomes faster and more energy efficient. Related devices and materials are also described.