Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/83975
Title: Molecular conformation-dependent memory effects in non-conjugated polymers with pendant carbazole moieties
Authors: Lim, S.L.
Ling, Q. 
Eric Teo, Y.H. 
Zhu, C.X. 
Daniel Chan, S.H. 
Kang, E.T. 
Neon, K.G. 
Issue Date: 2008
Source: Lim, S.L.,Ling, Q.,Eric Teo, Y.H.,Zhu, C.X.,Daniel Chan, S.H.,Kang, E.T.,Neon, K.G. (2008). Molecular conformation-dependent memory effects in non-conjugated polymers with pendant carbazole moieties. Materials Research Society Symposium Proceedings 1071 : 109-114. ScholarBank@NUS Repository.
Abstract: Single-layer devices of the structure indium-tin-oxide/polymer/aluminum were fabricated from two non-conjugated polymers with pendant carbazole groups in different spacer units. The device based on poly(2-(N-carbazolyl)ethyl methacrylate) (PMCz) exhibited non-volatile write-once-read-many-times (WORM) memory behavior with an ON/OFF current ratio up to 106, while the device based on poly(9-(2-((4-vinylbenzyl)oxy)ethyl)-9H-carbazole) (PVBCz) exhibited volatile memory behavior with an ON/OFF current ratio of approximately 103. In the absence of a spacer unit between the pendant carbazole group and the main chain, regioregular poly(N-vinylcarbazole) (PVK) exhibited only one conductivity state (ON state). The formation of carbazole excimers resulting from conformation-induced conductance switching under an electric field was revealed in situ by fluorescence spectroscopy. The electrical behavior of the polymer in a device was found to be dictated by the chemical structure and steric effect of the spacer unit between the pendant carbazole group and the main chain. © 2008 Materials Research Society.
Source Title: Materials Research Society Symposium Proceedings
URI: http://scholarbank.nus.edu.sg/handle/10635/83975
ISBN: 9781605110417
ISSN: 02729172
Appears in Collections:Staff Publications

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