摘要:
Thin-film phase-change memories having small phase-change switching volume formed by overlapping thing films. Exemplary embodiments include a phase-change memory element, including a first phase change layer having a resistance, a second phase change layer having a resistance, an insulating layer disposed between the first and second phase change layers; and a third phase change layer having a resistance, and coupled to each of the first and second phase change layers, bridging the insulating layer and electrically coupling the first and second phase change layers, wherein the resistance of the third phase change layer is greater than both the resistance of the first phase change layer and the second phase change layer.
摘要:
A memory cell has thermal isolation material between a bottom electrode and a plug contact to confine heat in a memory element during programming and reset operations. In a particular embodiment, the memory element is a chalcogenide, such as GST. An electrically conductive barrier layer deposited over the contact and on sidewalls of a recess formed over the contact electrically couples the bottom electrode to the contact.
摘要:
A memory device. An array of memory elements is formed on a semiconductor chip. A parallel array of word lines extends in a first direction, connecting each memory element to a data source, and a parallel array of bit lines extends in a second direction, connecting each memory element to a data source, the second direction forming an acute angle to the first direction. The connection between each bit line and each memory element is a phase change element composed of memory material having at least two solid phases.
摘要:
A memory cell comprises a chalcogenide random access memory (CRAM) cell and a CMOS circuit. The CMOS circuit accesses the CRAM cell. The CRAM cell has a cross-sectional area that is determined by a thin film process (e.g., a chalcogenide deposition thin film process) and by an iso-etching process. If desired, the chalcogenide structure may be implemented in series with a semiconductor device such as a diode or a selecting transistor. The diode drives a current through the chalcogenide structure. The selecting transistor drives a current through the chalcogenide structure when enabled by a voltage at a gate terminal of the selecting transistor. The selecting transistor has a gate terminal, a source terminal, and a drain terminal; the gate terminal may be operatively coupled to a word line of a memory array, the source terminal may be operatively coupled to a drive line of the memory array, and the drain terminal may be operatively coupled to a bit line of the memory array.
摘要:
A process for fabricating phase-change elements having ultra small cross-sectional areas for use in phase change memory cells specifically and in semiconductor devices generally in which pads are implemented to create horizontally aligned phase change elements is disclosed. The elements thus defined may be used within chalcogenide memory cells or other semiconductor devices.
摘要:
Roughly described, a phase-change memory such as a chalcogenide-based memory is programmed optically and read electrically. No complex electrical circuits are required for programming the cells. On the other hand, this memory can be read by electrical circuitry directly. The read out speed is much faster than for optical disks, and integrated circuit chips made this way are more compatible with other electrical circuits than are optical disks. Thus memories according to the invention can have simple, low power-consuming, electrical circuits, and do not require slow and power-hungry disk drives for reading. The invention therefore provides a unique low power, fast read/write memory with simple electrical circuits.
摘要:
An implementing method of mobile group-buying system includes a buying group set-up step; a group-buying information creating step; a group-buying information transmitting step; and a group-buying information recording step. The mobile group-buying system is configured to allow at least two mobile communication devices to form a group-buying group, wherein each of the mobile communication devices is individually installed a group-buying APP. Further, initiator of each group-buying group can create group-buying information through the APP, and the group-buying information is issued to each participant of the buying group. Furthermore, when the buying group is established, the invitation of new attendants from any of the group participants to join the group of the same serial number is not accepted. Thus, the present disclosure not only can enhance participation rate of group-buying but also ensure the initiator and the participants in the buying group are in a first layer.
摘要:
A phase change material comprising a quaternary GaTeSb material consisting essentially of MA(GaxTeySbz)B, and where M comprises a group IVA element C, Si, Ge, Sn, Pb, a group VA element N, P, As, Sb, Bi, or a group VIA element O, S, Se, Te, Po, having a value A such that the transition temperature is increased relative to the transition temperature in GaxTeySbz, without M, and the difference between the melting temperature and the transition temperature is reduced relative to the difference in GaxTeySbz, without M.
摘要:
Memory cells described herein have an increased current density at lateral edges of the active region compared to that of conventional mushroom-type memory cells, resulting in improved operational current efficiency. As a result, the amount of heat generated within the lateral edges per unit value of current is increased relative to that of conventional mushroom-type memory cells. Therefore, the amount of current needed to induce phase change is reduced.
摘要:
Memory devices and methods for operating such devices are described herein. A method as described herein includes applying a reset bias arrangement to a memory cell to change the resistance state from the lower resistance state to the higher resistance state. The reset bias arrangement comprises a first voltage pulse. The method further includes applying a set bias arrangement to the memory cell to change the resistance state from the higher resistance state to the lower resistance state. The set bias arrangement comprises a second voltage pulse, the second voltage pulse having a voltage polarity different from that of the first voltage pulse.