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Multilevel Photonic Transistor Memory Devices Using Conjugated/Insulated Polymer Blend Electrets
ACS Applied Materials & Interfaces
|October 19, 2019
Summary
Researchers developed a novel polymer blend electret for photonic memory devices. This system enables rapid light-writing and voltage-erasing, achieving a high on/off ratio and long retention for multilevel data storage.
Area of Science:
- Materials Science
- Optoelectronics
- Polymer Chemistry
Background:
- Photonic data storage is crucial for optoelectronic applications like optical sensing, recording, integrated image circuits, and multibit-storage flash memory.
- Developing efficient charge storage materials is key to advancing photonic memory device performance.
Purpose of the Study:
- To explore conjugated/insulated polymer blends as charge storage electrets for photonic field-effect transistor memory devices.
- To investigate the impact of blend composition, energy level alignment, and morphology on memory characteristics.
- To demonstrate a new electret system for multilevel photonic memory applications.
Main Methods:
- Synthesized and blended various conjugated polymers (PF, MEH-PPV, SY-PPV, F8BT) with insulated polymers (PS, PMMA).
- Fabricated photonic memory devices using these polymer blend electrets.
- Evaluated device performance through light-writing/voltage-erasing tests, current on/off ratio measurements, retention time analysis, and surface potential analysis.
Main Results:
- The poly(9,9-di-n-octylfluorenyl-2,7-diyl)/polystyrene (PF/PS) blend electret demonstrated dynamic switching within 1 second, a high on/off ratio (>10^6), and over 3 months of data retention.
- Multilevel memory behavior was achieved using different light sources (405, 450, 520 nm) and energy intensities.
- The PF/PS blend, prepared from chlorobenzene, showed enhanced memory window due to improved morphology and increased contact area between the semiconductor and electret.
Conclusions:
- Conjugated/insulated polymer blends, particularly PF/PS, offer a promising new electret system for high-performance multilevel photonic memory devices.
- The morphology and charge storage properties of the polymer blend significantly influence device characteristics.
- This study paves the way for advanced photonic memory applications utilizing tailored polymer blend electrets.
