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Roll-to-roll printed resistive WORM memory on a flexible substrate.

Jaakko Leppäniemi¹, Tomi Mattila, Terho Kololuoma

¹VTT Technical Research Centre of Finland, Printed Functional Solutions, POB 1000, FI-02044 VTT, Espoo, Finland. jaakko.leppaniemi@vtt.fi

|July 12, 2012

Summary

Fully roll-to-roll printed resistive memory devices were fabricated on flexible substrates. These low-voltage devices utilize silver nanoparticle inks for efficient write-once-read-many data storage, enabling low-cost mass production.

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Area of Science:

Materials Science
Electrical Engineering
Nanotechnology

Background:

Resistive random-access memory (RRAM) offers a promising alternative for future electronic devices.
Flexible electronics require scalable and cost-effective fabrication methods for mass production.

Purpose of the Study:

To present the fabrication and operational characteristics of a fully roll-to-roll printed resistive write-once-read-many (WORM) memory.
To investigate the electrical performance and long-term stability of these flexible memory devices.

Main Methods:

Utilizing a fully roll-to-roll printing process for fabricating memory devices on flexible substrates.
Formulating a bit ink by mixing two silver nanoparticle inks to tune resistance and create percolating paths.
Conducting electrical testing to evaluate read/write characteristics and long-term stability of the '0' state under various environmental conditions.

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Main Results:

Achieved low-voltage (<10 V) write operation from a high resistivity '0' state to a low resistivity '1' state via rapid electrical sintering of silver nanoparticle bits.
Demonstrated tunable initial square resistance and self-organized percolating path networks within the memory bits.
Characterized electrical performance, including read/write operations, and assessed the long-term stability of the '0' state.

Conclusions:

The developed roll-to-roll printed resistive WORM memory exhibits promising performance for flexible electronics.
The fabrication method using silver nanoparticle inks is suitable for low-cost mass printing applications.
Further investigation into the stability of the '0' state under diverse environmental conditions is crucial for practical implementation.