Journal
POLYMER CHEMISTRY
Volume 3, Issue 8, Pages 2028-2033Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2py20129a
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Funding
- National Research Foundation (NRF) of Korea (Doyak Program) [2011-0028678]
- National Research Foundation (NRF) of Korea (Center for Electro-Photo Behaviors in Advanced Molecular Systems) [2010-0001784]
- Ministry of Education, Science & Technology (MEST), Korea (BK21 Program)
- Ministry of Education, Science & Technology (MEST), Korea (World Class University Program) [R31-2008-000-10059-0]
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In this work, an ionic conjugated polymer with propargyl side groups (poly(2-ethynylpyridinum bromide); PEP-P) was synthesized. High-quality thin films with smooth surfaces were prepared from this polymer on silicon substrates and metal electrodes, via a conventional, simple solution-coating and drying process. Synchrotron X-ray scattering analysis showed that the polymer in the nanoscale thin films was amorphous, but was somewhat preferentially oriented in the film plane, rather than randomly oriented. Using synchrotron X-ray reflectivity analysis, the electron densities and interfaces between the polymer film layers and the silicon substrate and metal electrodes were examined in detail. To our knowledge, PEP-P is the first ionic conjugated polymer to be shown to exhibit electrically nonvolatile memory behavior. The polymer in the nanoscale thin films showed excellent write-once-read-many-times (WORM) memory characteristics, without any polarity. The switching-ON voltage was lower than 1.5 V. WORM memory devices based on PEP-P were highly stable, even under ambient air conditions. PEP-P therefore has great potential as a candidate material for the low-cost mass production of high-performance, programmable unipolar WORM memory devices with very low power consumption.
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