AI Article Synopsis

  • - A series of new organic small molecules designed with A-π-D-π-A and D-π-D-π-D architectures were created to explore the donor-acceptor system in resistive memory devices.
  • - Devices based on A-π-D-π-A structures showed write-once-read-many memory behavior with a good retention time, while D-π-D-π-D molecules acted like conductors with no memory function.
  • - The study indicated that the choice of substituents on the molecules influenced their electrical properties and switching behaviors, making D-A architectures particularly suitable for effective memory devices.

Article Abstract

To better understand the structure-property relationship and the significance of the donor-acceptor (D-A) system in resistive memory devices, a series of new organic small molecules with A-π-D-π-A- and D-π-D-π-D-based architecture comprising a bis(triphenylamine) core unit and ethynyl-linked electron donor/acceptor arms were designed and synthesized. The devices with A-π-D-π-A structures exhibited write-once-read-many memory behavior with a good retention time of 1000 s while those based on D-π-D-π-D molecules presented only conductor property. The compound with nitrophenyl substitution resulted in a higher ON/OFF current ratio of 10, and the fluorophenyl substitution exhibited the lowest threshold voltage of -1.19 V. Solubility of the compounds in common organic solvents suggests that they are promising candidates for economic solution-processable techniques. Density functional theory calculations were used to envision the frontier molecular orbitals and to support the proposed resistive switching mechanisms. It is inferred that the presence of donor/acceptor substituents has a significant impact on the highest occupied molecular orbital-lowest unoccupied molecular orbital energy levels of the molecules, which affects their memory-switching behavior and thus suggests that a D-A architecture is ideal for memory device resistance switching characteristics.

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Source
http://dx.doi.org/10.1021/acsami.3c00439DOI Listing

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