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Field enhanced charge carrier reconfiguration in electronic and ionic coupled dynamic polymer resistive memory
Jun Hui Zhao1, Douglas J Thomson, Matt Pilapil
1Department of Electrical and Computer Engineering, University of Manitoba, Winnipeg, MB, Canada.
Nanotechnology
|March 9, 2010
Summary
Researchers demonstrated dynamic resistive memory devices using conjugated polymers. Increasing the applied electric field significantly speeds up data writing in these polypyrrole-based memory devices, showing promise for future scaling.
Area of Science:
- Materials Science
- Electrical Engineering
- Nanotechnology
Background:
- Conjugated polymer composites offer potential for advanced electronic devices.
- Dynamic resistive memory relies on ion migration for data storage.
- Understanding ion dynamics is crucial for optimizing device performance.
Purpose of the Study:
- Investigate the dynamics of conjugated polymer-based resistive memory devices.
- Determine the effect of applied electric fields on data writing speed.
- Develop a model to interpret device behavior.
Main Methods:
- Fabrication and testing of dynamic resistive memory devices using polypyrrole (PPy) and dodecylbenzenesulfonate (DBS(-)) composite.
- Experimental measurement of transient conducting behaviors under varying electric fields.
- Application of a conductance model incorporating space charge limited current and ion reconfiguration.
Main Results:
- Increasing applied electric fields dramatically enhances the rate of information writing.
- A 50-fold decrease in write time was observed by increasing write potential from 2.5 V to 5.5 V in 500 nm devices.
- Transient current states, controlled by pulse magnitude and width, are used for digital state storage.
Conclusions:
- The studied conjugated polymer composite memory devices exhibit favorable scaling properties.
- Write times are expected to decrease rapidly with increasing ion driving fields and decreasing device size.
- Field-driven ion migration is a key mechanism for high-speed data writing in these devices.
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