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Related Experiment Video

Updated: May 15, 2026

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
09:49

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx

Published on: May 13, 2020

Fine-Tuning the Resistive Switching of Organic Write-Once-Read-Many Memory Devices Using Functionalized Pyridine

Lenin Jayalakshmi1, Murali Ardra1, Predhanekar Mohamed Imran2

  • 1Organic Electronics Division, Department of Chemistry, Central University of Tamil Nadu, Thiruvarur, India.

Chempluschem
|May 14, 2026
PubMed
Summary

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Organic & biomolecular chemistry·2025

Researchers developed new organic small molecules for nonvolatile resistive switching memory. These donor-π-bridge-acceptor (D-π-A) materials show promise for high-performance, solution-processable electronic devices.

Area of Science:

  • Materials Science
  • Organic Electronics
  • Nanotechnology

Background:

  • Nonvolatile resistive switching memory devices are crucial for next-generation electronics.
  • Organic small molecules offer tunable properties for memory applications.
  • Developing efficient and stable organic memory materials remains a key challenge.

Purpose of the Study:

  • To design, synthesize, and investigate novel donor-π-bridge-acceptor (D-π-A) organic small molecules for nonvolatile resistive switching memory.
  • To explore the structure-property relationships governing the performance of these memory devices.
  • To elucidate the resistive switching mechanism in these organic materials.

Main Methods:

  • Synthesis of D-π-A organic small molecules using Pd-catalyzed Suzuki cross-coupling and Wittig-Horner condensation.
Keywords:
donor‐bridge‐acceptor systemhighest occupied molecular orbital–lowest unoccupied molecular orbitalorganic memorypyridinewrite‐once‐read‐many

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Last Updated: May 15, 2026

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  • Characterization of photophysical and electrochemical properties, including intramolecular charge transfer (ICT) and optical bandgap determination.
  • Fabrication and electrical testing of memory devices, including ON/OFF ratio and retention time measurements.
  • Computational analysis using density functional theory (DFT) and electrostatic potential mapping.
  • Thin-film morphology and crystalline structure analysis using GI-XRD.

    • Main Results:

    • Successfully synthesized a series of D-π-A organic small molecules with pyridine-functionalized cores.
    • Demonstrated stable binary resistive switching memory behavior with ON/OFF ratios > 10^3 s and retention times > 10^3 s.
    • Identified a dibenzofuran-nitrophenyl derivative exhibiting superior performance with a low threshold voltage (-1.11 V) and high ON/OFF ratio (10^5).
    • Confirmed strong ICT and narrow optical bandgaps (3.10-3.20 eV) for the synthesized molecules.
    • Supported a charge transfer-assisted, charge trapping-enabled resistive switching mechanism via DFT and electrostatic potential analyses.
    • Observed uniform thin-film coverage and crystalline ordering.

    Conclusions:

    • The tunable D-π-A substitution strategy is effective for designing high-performance organic memory materials.
    • These solution-processable organic small molecules show significant potential for advanced nonvolatile memory applications.
    • Structural asymmetry and judicious selection of donor/acceptor units are critical for optimizing memory device performance.