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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
Issue Date: Jan-2012
Source: 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.
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
ISSN: 21926506
DOI: 10.1002/cplu.201100007
Appears in Collections:Staff Publications

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