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https://doi.org/10.1002/cplu.201100007
Title: | Electrical bistability and WORM memory effects in donor-acceptor polymers based on poly(N-vinylcarbazole) | Authors: | Zhang, B. Liu, G. Chen, Y. Wang, C. Neoh, K.-G. Bai, T. Kang, E.-T. |
Keywords: | Bistable switching Charge transfer Conformational relaxation Memory-switching devices Poly(N-vinylcarbazole)s |
Issue Date: | Jan-2012 | Citation: | Zhang, B., Liu, G., Chen, Y., Wang, C., Neoh, K.-G., Bai, T., Kang, E.-T. (2012-01). Electrical bistability and WORM memory effects in donor-acceptor polymers based on poly(N-vinylcarbazole). ChemPlusChem 77 (1) : 74-81. ScholarBank@NUS Repository. https://doi.org/10.1002/cplu.201100007 | Abstract: | Bistable electrical conductivity switching behavior and write-once, read-many-times (WORM) memory effects have been demonstrated in Al/polymer/ITO sandwich devices. These devices were constructed from two poly(N-vinylcarbazole) derivatives with pendant donor-trap-acceptor (D-T-A) structures. The observed electrical bistability can be attributed to the field-induced charge-transfer interaction between the carbazole electron- donor unit and the terminal electron-acceptor unit, and subsequent charge trapping at the intermediate azobenzene chromophores. The charge-transfer and trapping processes are further stabilized by the conformational relaxation of the total energy of the D-T-A system through donor-acceptor electrostatic interaction. The proposed switching and conduction mechanism is supported by density functional theory calculations, UV/Visible absorption spectra, core-level X-ray photoelectron spectra, and high-resolution transmission electron microscopy images of the polymer thin films. The influence of the charge-trapping effect of the azobenzene mediator is further explored by studying the electronic properties of two other poly(N-vinylcarbazole) derivatives as the control samples, in which nitro or cyano acceptor groups are directly bonded to the carbazole electron-donor moieties. © 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. | Source Title: | ChemPlusChem | URI: | http://scholarbank.nus.edu.sg/handle/10635/63805 | ISSN: | 21926506 | DOI: | 10.1002/cplu.201100007 |
Appears in Collections: | Staff Publications |
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