Exploring the potential of malononitrile functionalized donor-acceptor systems for non-volatile memory device...

Area of Science:

• Materials Science
• Organic Electronics
• Nanotechnology

Background:

• Organic small molecules are promising for advanced electronic applications.
• Resistive switching memory offers non-volatile data storage solutions.
• Understanding structure-property relationships is key to optimizing molecular design.

Purpose of the Study:

• To design, synthesize, and evaluate novel D-bridge-A organic small molecules for non-volatile resistive switching memory.
• To investigate the structure-property relationships influencing memory performance.
• To explore the potential for low-cost fabrication using these molecules.

Main Methods:

• Synthesis of D-bridge-A organic small molecules incorporating malononitrile units with various donors (dibenzofuran, dibenzothiophene, triphenylamine).
• Photophysical and electrochemical analyses to determine optical band gaps and intramolecular charge transfer.
• Fabrication and testing of memory devices to evaluate resistive switching characteristics (ON/OFF ratio, threshold voltage, retention time).
• Density functional theory (DFT) calculations to visualize molecular orbitals and elucidate switching mechanisms.

Main Results:

• All synthesized compounds demonstrated robust non-volatile resistive switching memory (WORM) with ON/OFF ratios from 10^2 to 10^3.
• Optimal band gaps ranged from 2.20 to 3.10 eV, indicating significant intramolecular charge transfer.
• Triphenylamine-based molecules exhibited superior memory performance.
• Low threshold voltage (-1.25 V) and long retention times (10^3 s) were achieved.
• Good solubility in organic solvents suggests suitability for cost-effective fabrication.

Conclusions:

• Novel D-bridge-A organic small molecules show significant potential for non-volatile WORM memory applications.
• Molecular design, particularly the choice of donor units, critically impacts memory performance.
• The developed molecules are viable for low-cost fabrication techniques, paving the way for practical applications.
• Strategic molecular design with equipotential donors and acceptors is crucial for optimizing device performance and applicability.