Research Papers

Noise-driven signal transmission device using molecular dynamics of organic polymers

[+] Author Affiliations
Naoki Asakawa

Gunma University, Molecular Science Division, Faculty of Science and Technology, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan

Koichiro Umemura, Shinya Fujise

Gunma University, Molecular Science Division, Faculty of Science and Technology, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan

Koji Yazawa

JEOL Resonance Inc., Musashino, Akishima, Tokyo 196-8558, Japan

Tadashi Shimizu, Masataka Tansho

National Institute for Material Science, 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan

Teruo Kanki, Hidekazu Tanaka

Osaka University, Institute of Scientific and Industrial Research, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan

J. Nanophoton. 8(1), 083077 (Aug 06, 2014). doi:10.1117/1.JNP.8.083077
History: Received April 9, 2014; Revised July 10, 2014; Accepted July 14, 2014
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Abstract.  Stochastic threshold devices using a trap-filling transition (TFT) coupled with molecular dynamics in poly(3-alkylthiophene)s were fabricated as potential key devices for noise-driven bioinspired sensors and information processors. This article deals with variable-temperature direct current conductivity and alternating current impedance measurements for vertical-type device elements of Au/regioregular poly(3-decylthiophene) ((RR−P3DT) (thickness:100nm)/Au, which show multiple conducting states and quasi-stochastic transitions between these states. Noise measurements indicate the ω2-type (if V<VTFT=10V) and ω1-type (if V>VTFT) power spectral densities, where V and VTFT are an applied voltage and the voltage for TFT, respectively. The noise generation is due to the TFT associated with twist dynamics of π-conjugated polymers near the order-disorder phase transition (ODT). At 298 K, the quasi-stochastic behavior is more noticeable for RR-P3DT than poly(3-hexylthiophene). The quasi-stochastic property is employed to a stochastic one-directional signal transmitting device using optical-electric conversion. The dynamics of ODT for powder samples were also investigated by differential scanning calorimetry measurements and high-resolution solid-state C13 nuclear magnetic resonance spectroscopy, and the correlation of the molecular structure and dynamics with electric properties was discussed.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Naoki Asakawa ; Koichiro Umemura ; Shinya Fujise ; Koji Yazawa ; Tadashi Shimizu, et al.
"Noise-driven signal transmission device using molecular dynamics of organic polymers", J. Nanophoton. 8(1), 083077 (Aug 06, 2014). ; http://dx.doi.org/10.1117/1.JNP.8.083077


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