Please use this identifier to cite or link to this item: https://doi.org/10.1098/rsta.2008.0262
Title: Tristable electrical conductivity switching in a polyfluorene- diphenylpyridine copolymer with pendant carbazole groups
Authors: Liu, G. 
Liaw, D.-J.
Lee, W.-Y.
Ling, Q.-D. 
Zhu, C.-X. 
Chan, D.S.-H. 
Kang, E.-T. 
Neoh, K.-G. 
Keywords: Charge transfer
Conformational ordering
Conjugated copolymer
Tristable switching
Issue Date: 28-Oct-2009
Citation: Liu, G., Liaw, D.-J., Lee, W.-Y., Ling, Q.-D., Zhu, C.-X., Chan, D.S.-H., Kang, E.-T., Neoh, K.-G. (2009-10-28). Tristable electrical conductivity switching in a polyfluorene- diphenylpyridine copolymer with pendant carbazole groups. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 367 (1905) : 4203-4214. ScholarBank@NUS Repository. https://doi.org/10.1098/rsta.2008.0262
Abstract: Tristable electrical conductivity switching and non-volatile memory effects are demonstrated in a conjugated copolymer of poly(2,6-diphenyl-4-((9-ethyl)- 9H- carbazole)-pyridinyl-alt-2,7-(9,9-didodecyl)-9H-fluorenyl) (PPCzPF). The indium-tin oxide (ITO)/PPCzPF/Al device can be switched from the low-conductivity (off) state to the first high-conductivity (on-1) state at 1.8V, with an on/off current ratio of approximately 100. The device can be further switched from the on-1 state to the next higher conductivity (on-2) state at 2.4V, with an on-2/on-l current ratio of approximately 20. All the three conductivity states are accessible, stable and nonerasable. The tri-level conductance switching can be explained in terms of field-induced conformational ordering of the polymer chains and enhanced charge-transfer interaction at the PPCzPF/ITO interface. © 2009 The Royal Society.
Source Title: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
URI: http://scholarbank.nus.edu.sg/handle/10635/51063
ISSN: 1364503X
DOI: 10.1098/rsta.2008.0262
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