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Introducing redox-active ferrocene to quinoxaline small molecules enhances resistive switching memory. These novel systems show excellent non-volatile WORM memory performance with high ON/OFF ratios and low threshold voltages.

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Area of Science:

  • Organic electronics
  • Materials science
  • Molecular engineering

Background:

  • Organic small molecules are promising for electronic memory devices.
  • Tuning molecular structure impacts electronic properties and device performance.
  • Redox-active units can influence charge transport and memory effects.

Purpose of the Study:

  • To investigate the effect of incorporating a redox-active ferrocene unit into quinoxaline-based organic small molecules.
  • To explore how modifications on the quinoxaline acceptor influence resistive switching memory behavior.
  • To correlate molecular properties with device performance characteristics.

Main Methods:

  • Synthesis of novel quinoxaline-ferrocene systems with varied substitutions.
  • Fabrication and characterization of resistive switching memory devices.
  • Photophysical and electrochemical studies to understand electronic properties.
  • Molecular simulations to validate the resistive switching mechanism.

Main Results:

  • Devices exhibited non-volatile Write-Once-Read-Many (WORM) memory behavior.
  • Achieved high ON/OFF ratios (>10^4) and a low threshold voltage (-0.69 V).
  • Demonstrated good endurance (100 cycles) and retention (10^4 s).
  • Photophysical studies confirmed intramolecular charge transfer; electrochemical studies showed modulated ferrocene redox activity.

Conclusions:

  • The integration of redox-active ferrocene units significantly impacts resistive switching memory.
  • Molecular design, including substitutions on the quinoxaline unit, allows tuning of electronic properties and device performance.
  • The observed memory behavior is attributed to a combination of charge transfer, charge trapping, and ferrocene redox activity.