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Extended switching endurance of phase change memory through nano-confined cell structure
Jia Zheng1,2, Ruobing Wang1, Wencheng Fang1
1State Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, China.
Nature Communications
|July 2, 2025
Summary
Researchers boosted phase change memory endurance beyond 1.1 × 1011 cycles using nano-confined structures and carbon-doped GeSbTe. This overcomes switching current and endurance challenges for storage class memory.
Area of Science:
- Materials Science
- Electrical Engineering
- Semiconductor Devices
Background:
- Phase change memory (PCM) is a promising technology for storage class memory.
- High switching current and limited endurance are critical challenges for PCM adoption.
Purpose of the Study:
- To demonstrate enhanced switching endurance in PCM devices.
- To investigate the impact of nano-confinement and material doping on device performance and failure mechanisms.
Main Methods:
- Fabrication of mushroom-type PCM devices with a nano-confined structure.
- Utilized carbon-doped GeSbTe as the phase change material.
- Conducted extensive cyclic switching tests to evaluate endurance and failure modes.
Main Results:
- Achieved switching endurance exceeding 1.1 × 1011 cycles.
- Identified over-programming and carbon migration as failure mechanisms.
- Nano-confinement reduced RESET energy and mitigated over-programming, extending device life.
Conclusions:
- Nano-confined structures and carbon-doped GeSbTe significantly enhance PCM switching endurance.
- The study provides insights into failure mechanisms and mitigation strategies for reliable PCM.
- This advancement addresses key challenges for PCM in storage class memory applications.
