Please use this identifier to cite or link to this item:
|Title:||Electrical bistability and WORM memory effects in donor-acceptor polymers based on poly(N-vinylcarbazole)|
|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. 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.|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Mar 7, 2018
WEB OF SCIENCETM
checked on Feb 5, 2018
checked on Mar 11, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.