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Issue 16, 2011
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Electrical conductivity switching and memory effects in poly(N-vinylcarbazole) derivatives with pendant azobenzene chromophores and terminal electron acceptor moieties

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Abstract

Bistable electrical conductivity switching and non-volatile memory effects were demonstrated in Al/polymer/indium-tin oxide sandwich structure devices, constructed from two poly(N-vinylcarbazole) derivatives with pendant azobenzene chromophores and terminal electron acceptor moieties (–NO2 or –CN). Both polymers (PVK-AZO-NO2 and PVK-AZO-2CN) exhibit write-once read-many-times (WORM) type memory effects, with low switching threshold voltages below −2 V and high ON/OFF current ratios of ∼105–106. The observed electrical bistability in both polymers can be attributed to the field-induced charge transfer interaction between carbazole electron donor and terminal electron acceptor (–NO2 or –CN) moieties, and subsequent charge trapping at the intermediate azobenzene chromophores. The proposed switching mechanism is supported by the changes in the UV-visible absorption spectra of the polymer film upon transition from the OFF to the ON state.

Graphical abstract: Electrical conductivity switching and memory effects in poly(N-vinylcarbazole) derivatives with pendant azobenzene chromophores and terminal electron acceptor moieties

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Publication details

The article was received on 12 Dec 2010, accepted on 21 Feb 2011 and first published on 18 Mar 2011


Article type: Paper
DOI: 10.1039/C0JM04344C
Citation: J. Mater. Chem., 2011,21, 6027-6033
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    Electrical conductivity switching and memory effects in poly(N-vinylcarbazole) derivatives with pendant azobenzene chromophores and terminal electron acceptor moieties

    G. Liu, B. Zhang, Y. Chen, C. Zhu, L. Zeng, D. Siu-Hung Chan, K. Neoh, J. Chen and E. Kang, J. Mater. Chem., 2011, 21, 6027
    DOI: 10.1039/C0JM04344C

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