文献类型：期刊文献

英文题名：Electrical conductivity switching and memory effects in poly(N-vinylcarbazole) derivatives with pendant azobenzene chromophores and terminal electron acceptor moieties

作者：Liu, Gang[1,2]; Zhang, Bin[1]; Chen, Yu[1]; Zhu, Chun-Xiang[3]; Zeng, Longjia[1]; Siu-Hung Chan, D.[3]; Neoh, Koon-Gee[2]; Chen, Junneng[1]; Kang, En-Tang[2]

机构：[1] Key Laboratory for Advanced Materials, Institute of Applied Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China; [2] Department of Chemical and Biomolecular Engineering, National University of Singapore, Kent Ridge 119260, Singapore; [3] Department of Electrical and Computer Engineering, National University of Singapore, Kent Ridge 119260, Singapore

年份：2011

卷号：21

期号：16

起止页码：6027

外文期刊名：Journal of Materials Chemistry

收录：EI(收录号：20111913961034)

语种：英文

外文关键词：Electric conductivity - Polymer films - Semiconducting films - Threshold voltage - Digital storage - Electrons - Nitrogen oxides - Aluminum oxide - Azobenzene

摘要：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.