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Programming voltage reduction in phase change memory cells with tungsten trioxide bottom heating layer/electrode.

Feng Rao¹, Zhitang Song, Yuefeng Gong

¹State Key Laboratory of Functional Materials for Informatics, Laboratory of Nanotechnology, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China.

|August 12, 2011

Summary

Tungsten trioxide in phase change memory cells lowers reset voltage. This improvement in phase change memory (PCM) devices stems from tungsten trioxide's low thermal conductivity, enhancing thermal efficiency.

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Area of Science:

Materials Science
Electrical Engineering
Solid-State Physics

Background:

Phase Change Memory (PCM) cells are crucial for non-volatile data storage.
Optimizing PCM cell performance, particularly reducing reset voltage, is a key research area.
Tungsten trioxide (WO3) is explored as a novel material for enhancing thermal properties in electronic devices.

Purpose of the Study:

To investigate the use of a tungsten trioxide (WO3) bottom heating layer/electrode in phase change memory (PCM) cells.
To analyze the impact of WO3 on the thermal dynamics and reset voltage of PCM devices.
To understand the thermal mechanisms behind the performance improvements observed with WO3.

Main Methods:

Fabrication of PCM cells incorporating a tungsten trioxide heating layer/electrode.
Experimental characterization of cell performance, focusing on reset voltage.
Theoretical thermal simulation and calculation of the reset process.

Main Results:

The crystalline tungsten trioxide heating layer effectively promotes temperature rise in the Ge(2)Sb(2)Te(5) layer.
A significant reduction in reset voltage was observed compared to conventional PCM cells.
Low thermal conductivity of crystalline WO3 was identified as the primary factor for improved thermal efficiency.

Conclusions:

Tungsten trioxide serves as an effective heating layer/electrode in PCM cells, reducing operational voltage.
The enhanced thermal efficiency is attributed to the intrinsic low thermal conductivity of WO3.
This study demonstrates a promising approach for developing more energy-efficient phase change memory devices.