Incorporating a redox active entity to attain electrical bistability in a polymer semiconductor

Area of Science:

• Materials Science
• Organic Electronics
• Nanotechnology

Background:

• Polymer-based resistive memory devices are emerging as a cost-effective and scalable alternative to traditional oxide-based technologies.
• These devices leverage solution-state processing, enabling 3-D printable stack fabrication.
• Resistive memory devices are crucial for next-generation electronic applications, including non-volatile memory and neuromorphic computing.

Purpose of the Study:

• To investigate polymer-based resistive memory devices utilizing a redox-switch mechanism.
• To demonstrate reversible non-volatile resistive state switching with high device yield.
• To elucidate the role of a redox-active anthraquinone unit in enabling bistable conductive states.

Main Methods:

• Synthesis of a polymer semiconductor conjugated with a redox-active anthraquinone chemical entity.
• Fabrication and characterization of polymer-based resistive memory devices.
• Control experiments using a model compound to confirm the mechanism.
• Optical studies and molecular modeling to investigate charge transfer characteristics.

Main Results:

• Achieved reversible non-volatile resistive state switching with a high device yield exceeding 80%.
• Confirmed the critical role of the anthraquinone unit in the polymeric backbone for the redox-switch mechanism.
• Uniform nanodomains and trap-free layers ruled out alternative switching mechanisms.
• Optical and molecular modeling data indicated strong charge transfer characteristics upon excitation.

Conclusions:

• Polymer-based resistive memory devices incorporating redox-active anthraquinone units exhibit efficient and reliable non-volatile resistive switching.
• The anthraquinone moiety is essential for inducing bistable conductive states through charge transfer mechanisms.
• These findings highlight the potential of polymer-based materials for advanced memory applications.