Journal
ORGANIC ELECTRONICS
Volume 15, Issue 6, Pages 1290-1298Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2014.02.027
Keywords
Organic resistive memory; Bipolar switching; Water-soluble polyfluorene; Ethylene oxide side chain; Conjugated polyelectrolyte
Funding
- National Research Foundation of Korea (NRF) [2013-059210, 2008-0062606]
- CELA-NCRC
- Korea Institute of Science and Technology (KIST) Institutional Program
- Center for Advanced Soft Electronics under the Global Frontier Research Program of the Ministry of Science [2013M3A6A5073183]
- Dongguk University Research Fund
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This paper investigates the effects of side chains, which are important structural constituents, on the characteristics of organic resistive memory devices with water-soluble polyfluorene (WPF) derivatives. The WPF derivatives have either an ethylene oxide (EO) or an alkyl side chain the lengths of the EO side chains are 2, 4, or 6 molecules. WPFs exhibit typical bipolar switching behaviors with reliable non-volatile characteristics and good deviceto- device uniformity under ambient conditions. WPFs with the EO side chains showed better memory characteristics than those of the alkyl side chains of similar length. In addition, as the EO unit lengthened, the ON/OFF ratio of the memory device gradually increased from 5 Chi 10(2) to 10(5), and the threshold voltage (V-th) progressively decreased from 4 to 3.5 V. The retention times for WPF-hexyl, WPF-2O, WPF-4O, and WPF-6O are 10(4), 200, 10(4), and 10(4) s, respectively. The excellent switching properties of WPF-4O and WPF-6O are believed to be mainly attributed to highly localized current pathways and the low trap density. (C) 2014 Elsevier B. V. All rights reserved.
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