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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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A Real-world What-Where-When Memory Test
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Thermal Barrier Phase Change Memory.

Jiabin Shen1,2, Shilong Lv1, Xin Chen1,3

  • 1State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Micro-System and Information Technology , Chinese Academy of Sciences , Shanghai 200050 , China.

ACS Applied Materials & Interfaces
|January 10, 2019
PubMed
Summary
This summary is machine-generated.

Phase change memory (SCM) using TiTe2/Sb2Te3 multilayers significantly reduces operating current and enhances speed. This novel structure offers improved device lifetime and stability for next-generation memory applications.

Keywords:
TiTe2TiTe2/Sb2Te3Ti−Sb−Teatom probe tomographyhigh endurancelow energy consumptionthermal barrier phase change material

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Nanotechnology

Background:

  • Phase change memory (SCM) is a promising technology for bridging the performance gap between DRAM and flash memory.
  • High operating current is a major limitation for SCM applications, even with advanced materials like Ti-doped Sb2Te3.

Purpose of the Study:

  • To reduce the operating current in phase change memory devices.
  • To enhance the speed and endurance of SCM devices.
  • To investigate the role of semimetallic layers in improving SCM properties.

Main Methods:

  • Fabrication of TiTe2/Sb2Te3 multilayer structures.
  • Characterization of electrical properties, including operating current and switching speed.
  • Assessment of device lifetime and cyclability.
  • Utilizing correlative electron microscopy and atom probe tomography for structural analysis.

Main Results:

  • Achieved an approximately 87% reduction in operating current by using TiTe2 as a thermal barrier.
  • Enabled ultrafast crystallization speeds of approximately 10 ns.
  • Demonstrated an outstanding device lifetime of up to 2 × 10^7 cycles.
  • Maintained a stable layer-stacked structure, preventing phase segregation and element intermixing.

Conclusions:

  • Spatially separating Sb2Te3 and TiTe2 layers effectively reduces operating current and enhances crystallization speed.
  • The TiTe2/Sb2Te3 multilayer structure offers superior cyclability and device lifetime compared to alloy-based cells.
  • Incorporating semimetallic layers like TiTe2 and TiSe2 is a viable strategy for developing high-performance phase change memory.