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https://doi.org/10.1039/c0jm04344c
Title: | Electrical conductivity switching and memory effects in poly(N-vinylcarbazole) derivatives with pendant azobenzene chromophores and terminal electron acceptor moieties | Authors: | Liu, G. Zhang, B. Chen, Y. Zhu, C.-X. Zeng, L. Siu-Hung Chan, D. Neoh, K.-G. Chen, J. Kang, E.-T. |
Issue Date: | 28-Apr-2011 | Citation: | Liu, G., Zhang, B., Chen, Y., Zhu, C.-X., Zeng, L., Siu-Hung Chan, D., Neoh, K.-G., Chen, J., Kang, E.-T. (2011-04-28). Electrical conductivity switching and memory effects in poly(N-vinylcarbazole) derivatives with pendant azobenzene chromophores and terminal electron acceptor moieties. Journal of Materials Chemistry 21 (16) : 6027-6033. ScholarBank@NUS Repository. https://doi.org/10.1039/c0jm04344c | 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 ∼10 5-106. 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. © 2011 The Royal Society of Chemistry. | Source Title: | Journal of Materials Chemistry | URI: | http://scholarbank.nus.edu.sg/handle/10635/82248 | ISSN: | 09599428 | DOI: | 10.1039/c0jm04344c |
Appears in Collections: | Staff Publications |
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