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];Chan, D. Siu-Hung[3];Neoh, Koon-Gee[2];Chen, Junneng[1];Kang, En-Tang[2]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Inst Appl Chem, Shanghai 200237, Peoples R China;[2]Natl Univ Singapore, Dept Chem & Biomol Engn, Singapore 119260, Singapore;[3]Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 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：;WOS:【SCI-EXPANDED(收录号:WOS:000289260000030)】；

基金：The authors are grateful for the financial support of the National Natural Science Foundation of China (21074034), the Ministry of Education of China (309013), the Fundamental Research Funds for the Central Universities, the Shanghai Municipal Educational Commission for the Shuguang fellowship (08GG10) and the Shanghai Eastern Scholarship.

语种：英文

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 (-NO(2) or -CN). Both polymers (PVK-AZO-NO(2) 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 similar to 10(5)-10(6). 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 (-NO(2) 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.