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Molecular Conformation-dependent Memory Effects in Non-conjugated Polymers with Pendant Carbazole Moieties

Published online by Cambridge University Press:  01 February 2011

Siew Lay Lim ,
Qidan Ling ,
Eric Yeow Hwee Teo ,
Chun Xiang Zhu ,
Daniel Siu Hung Chan ,
En Tang Kang  and
Koon Gee Neoh
Siew Lay Lim
Affiliation:
g0404230@nus.edu.sg, National University of Singapore, NUS Graduate School of Integrative Sciences and Engineering (NGS), Centre for Life Sciences (CeLS), #05-01, 28 Medical Drive, Singapore, 117456, Singapore
Qidan Ling
Affiliation:
chelqd@nus.edu.sg, National University of Singapore, Department of Chemical and Biomolecular Engineering, Singapore, N/A, Singapore
Eric Yeow Hwee Teo
Affiliation:
chetyhe@nus.edu.sg, National University of Singapore, SNDL, Department of Electrical and Computer Engineering, Singapore, N/A, Singapore
Chun Xiang Zhu
Affiliation:
elezhucx@nus.edu.sg, National University of Singapore, SNDL, Department of Electrical and Computer Engineering, Singapore, N/A, Singapore
Daniel Siu Hung Chan
Affiliation:
elecshd@nus.edu.sg, National University of Singapore, SNDL, Department of Electrical and Computer Engineering, Singapore, N/A, Singapore
En Tang Kang
Affiliation:
cheket@nus.edu.sg, National University of Singapore, Department of Chemical and Biomolecular Engineering, Singapore, N/A, Singapore
Koon Gee Neoh
Affiliation:
chenkg@nus.edu.sg, National University of Singapore, Department of Chemical and Biomolecular Engineering, Singapore, N/A, Singapore
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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 switching and memory effects observed were attributed to conformation changes of the pendant carbazole groups.

Keywords

polymermemorydevices
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1071: Symposium F – Materials Science and Technology for Nonvolatile Memories , 2008 , 1071-F05-01
Copyright
Copyright © Materials Research Society 2008

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References

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