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Issue 23, 2018
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Synthesis and non-volatile electrical memory characteristics of triphenylamine-based polyimides with flexibility segments

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Abstract

An efficient and readily available novel asymmetric diamine monomer containing a strongly electron-donating triphenylamine moiety and a flexibility segment was designed and synthesized through a Suzuki coupling reaction. Then, two thermally stable and highly soluble polyimides (PI(TPA-PMDA) and PI(TPA-BPDA)) were prepared and characterized. The ITO/PI(TPA-PMDA)/Al memory device exhibited write-once read-many-times (WORM) memory behavior with a threshold voltage of −1.12 V, while the PI(TPA-BPDA) memory device demonstrated flash-type memory behavior with a turn-on voltage at −0.78 V and a turn-off voltage at +1.98 V. Both devices showed high ON/OFF current ratios beyond 103 and long retention times of 4 × 103 s. Space-charge limited-current (SCLC) conduction and local filament conduction governed the OFF- and ON-state current conduction of the two memory devices, respectively. The electrical memory switching behaviors were induced by a charge transfer process under an applied electric field, and the differences between the dihedral angles and dipole moments resulted in different memory types.

Graphical abstract: Synthesis and non-volatile electrical memory characteristics of triphenylamine-based polyimides with flexibility segments

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Publication details

The article was received on 12 Aug 2018, accepted on 16 Oct 2018 and first published on 17 Oct 2018


Article type: Paper
DOI: 10.1039/C8NJ04103B
Citation: New J. Chem., 2018,42, 19008-19019
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    Synthesis and non-volatile electrical memory characteristics of triphenylamine-based polyimides with flexibility segments

    Y. Yang, J. Xia, Y. Zheng, Y. Shen and G. Gou, New J. Chem., 2018, 42, 19008
    DOI: 10.1039/C8NJ04103B

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