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Related Experiment Video

Updated: Nov 16, 2025

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx

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Published on: May 13, 2020

Reversible switching in bicontinuous structure for phase change random access memory application.

Yan Cheng¹, Yonghui Zheng², Zhitang Song³

¹Key Laboratory of Polar Materials and Devices (MOE), Department of Electronics, East China Normal University, Shanghai 200241, China. ycheng@ee.ecnu.edu.cn and State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.

|February 23, 2021

Summary

This summary is machine-generated.

Silicon-antimony-telluride phase change materials (PCMs) exhibit excellent thermal stability. A unique bicontinuous structure with nested amorphous silicon and antimony telluride phases enhances performance in phase-change random access memory devices.

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Assembly and Characterization of Biomolecular Memristors Consisting of Ion Channel-doped Lipid Membranes

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Area of Science:

Materials Science
Nanotechnology
Solid-State Electronics

Background:

Silicon-antimony-telluride (SiSbTe) phase change materials (PCMs) are known for their thermal stability.
Si content significantly influences the properties and microstructure of SiSbTe PCMs.
Si3.3Sb2Te3 (SST) demonstrates optimal electrical performance around 40% Si content.

Purpose of the Study:

To investigate the microstructure and properties of Si3.3Sb2Te3 (SST) phase change materials.
To elucidate the role of amorphous silicon in the phase transition mechanism.
To explore the potential of bicontinuous SiSbTe structures for advanced memory applications.

Main Methods:

Utilized advanced three-dimensional (3D) tomography.
Employed transmission electron microscopy (TEM).
Analyzed the microstructure and phase composition of crystallized SST films.

Main Results:

Identified a uniform, equiaxed microstructure in 3D space for crystallized SST.
Observed a nested structure of reversible Sb2Te3 (ST) and amorphous silicon (a-Si) phases.
Demonstrated significant retention of the metastable face-centered cubic (f-) ST phase above 370 °C.
Showcased a stable a-Si framework facilitating ST phase switching.

Conclusions:

The bicontinuous structure enhances phase switching localization and reduces energy consumption.
The stable amorphous silicon frame and reversible ST phase contribute to faster SET speeds and low-power RESET.
Bicontinuous SiSbTe structures show promise for phase-change random access memory (PCRAM), particularly for automotive electronics requiring high data retention.