Adjustment of active protons of end-electron-withdrawing groups in small molecules for different memory characteristics

Wang, Hongliang; Du, Yuting; Zhang, Xiaojuan; Zhao, Sanhu; Fan, Jianfeng; Su, Xiaorui; Sun, Xiaomin; Zhou, Shiyuan

doi:10.1016/j.dyepig.2022.110570

Cited by 2 publications

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“…Multilevel data storage has been performed based on fine-tuning of the electron-withdrawing groups, and the reports on multilevel storage devices are still limited. ,, In our previous work, triphenylamine was incorporated with two different acceptors to form various charge trapping centers to achieve a ternary memory. Nevertheless, the device still had binary memory characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…The small organic molecules possess excellent designability and adjustable functionalities in the molecular backbone, making them more promising than other organic-based materials. − Multilevel data storage is essential for high-density data storage technology. − Still, most of the previous reports are restricted to binary-based memory devices. Miao et al explored triphenylamine-based donor–acceptor (D–A) systems with electron-withdrawing groups, resulting in different charge trap depths.…”

Section: Introductionmentioning

confidence: 99%

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Arylacetylene End-Capped Triarylamine-Based D–A System for Switching from Binary to Ternary Memory Behavior

Harshini,

Angela,

Imran

et al. 2023

ACS Appl. Electron. Mater.

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Introducing a different acceptor into the same molecular backbone with a definite acceptor strength is the key to developing multilevel memory devices. A series of Y-shaped imidazole- and triarylamine-based compounds was designed and synthesized for multilevel data storage. The influence of various donor and acceptor end-cap units on the photophysical, electrochemical, and memory performance was evaluated. The electrochemical analysis reveals a high highest occupied molecular orbital (HOMO) level of around ∼5.0 eV and a low band gap with irreversible anodic peaks (1.05–1.08 V), which indicates facile charge transport in the donor/acceptor end-capped D–A systems. Switching the memory behavior from binary to ternary was achieved by tuning the acceptor strength in the molecular structure. The compounds with the terminal electron-withdrawing groups displayed a ternary memory with an ON/OFF ratio of 104 with a long-lasting retention time. tert-Butylphenyl and methoxyphenyl end-capped compounds demonstrated binary memory with a low threshold voltage (−1.42 and −1.38 V) and an ON/OFF ratio of 105. The molecular simulation confirms the charge transfer and trapping mechanism associated with the compound binary/ternary memory behavior. This work demonstrates that slight modification in the molecular structure can change the memory behavior from binary to ternary and renders a new pathway for updating the multilevel storage devices.

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