摘要:
The present invention relates to a phase changeable structure having decreased amounts of defects and a method of forming the phase changeable structure. A stacked composite is first formed by (i) forming a phase changeable layer including a chalcogenide is formed on a lower electrode, (ii) forming an etch stop layer having a first etch rate with respect to a first etching material including chlorine on the phase changeable layer, and (iii) forming a conductive layer having a second etch rate with respect to the first etching material on the etch stop layer. The conductive layer of the stacked composite is then etched using the first etching material to form an upper electrode. The etch stop layer and the phase changeable layer are then etched using a second etching material that is substantially flee of chlorine to form an etch stop pattern and a phase changeable pattern, respectively.
摘要:
A phase-changeable memory device may include a substrate, an insulating layer on the substrate, first and second electrodes, and a pattern of a phase-changeable material between the first and second electrodes. More particularly, the insulating layer may have a hole therein, and the first electrode may be in the hole in the insulating layer. Moreover, portions of the second electrode may extend beyond an edge of the pattern of phase-changeable material. Related methods are also discussed.
摘要:
A phase-changeable memory device may include a substrate, an insulating layer on the substrate, first and second electrodes, and a pattern of a phase-changeable material between the first and second electrodes. More particularly, the insulating layer may have a hole therein, and the first electrode may be in the hole in the insulating layer. Moreover, portions of the second electrode may extend beyond an edge of the pattern of phase-changeable material. Related methods are also discussed.
摘要:
A phase-changeable memory device may include a substrate, an insulating layer on the substrate, first and second electrodes, and a pattern of a phase-changeable material between the first and second electrodes. More particularly, the insulating layer may have a hole therein, and the first electrode may be in the hole in the insulating layer. Moreover, portions of the second electrode may extend beyond an edge of the pattern of phase-changeable material. Related methods are also discussed.
摘要:
A phase-changeable memory device may include a substrate, an insulating layer on the substrate, first and second electrodes, and a pattern of a phase-changeable material between the first and second electrodes. More particularly, the insulating layer may have a hole therein, and the first electrode may be in the hole in the insulating layer. Moreover, portions of the second electrode may extend beyond an edge of the pattern of phase-changeable material. Related methods are also discussed.
摘要:
A phase-changeable memory device may include a substrate, an insulating layer on the substrate, first and second electrodes, and a pattern of a phase-changeable material between the first and second electrodes. More particularly, the insulating layer may have a hole therein, and the first electrode may be in the hole in the insulating layer. Moreover, portions of the second electrode may extend beyond an edge of the pattern of phase-changeable material. Related methods are also discussed.
摘要:
In a program method for a multi-level phase change memory device, multi-level data to be programmed in a selected memory cell is received, and a program signal is applied to the selected memory cell according to the received multi-level data. Herein, a rising time of the program signal is set to be longer than a falling time of the program signal.
摘要:
Provided is a resistance variable memory device and a method for operating same. The resistance variable memory device has a phase change material between a top electrode and a bottom electrode. In the method for operating a resistance variable memory, the write current is applied in a direction from the top electrode to the bottom electrode, and the read current is applied in a direction from the bottom electrode to the top electrode. The phase change material is programmed by applying the write current, and a resistance drift of the phase change material is restrained by applying the read current.
摘要:
Provided is a method of programming a resistance variable memory device. The resistance variable memory device includes a memory cell having multi states and a write driver outputting a program pulse for programming the memory cell into one of the multi states. The method of programming the resistance variable memory device includes applying a first program pulse to the resistance variable memory device and applying a second program pulse to a memory cell when the memory cell is programmed into an intermediate state. When the first program pulse is a reset pulse, the reset pulse is an over program pulse, that is, an over reset pulse. Therefore, the resistance variable memory device can secure a sufficient read margin as well as improve a resistance drift margin.
摘要:
A phase change memory device and method of manufacturing the same is provided. A first electrode having a first surface is provided on a substrate. A second electrode having a second surface at a different level from the first surface is on the substrate. The second electrode may be spaced apart from the first electrode. A third electrode may be formed corresponding to the first electrode. A fourth electrode may be formed corresponding to the second electrode. A first phase change pattern may be interposed between the first surface and the third electrode. A second phase change pattern may be interposed between the second surface and the fourth electrode. Upper surfaces of the first and second phase change patterns may be on the same plane.