Please use this identifier to cite or link to this item: 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
Source: 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
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