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Proceedings Paper

Noise-driven signal transmission device using molecular dynamics of organic polymers
Author(s): Naoki Asakawa; Teruo Kanki; Hidekazu Tanaka
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Paper Abstract

Stochastic threshold devices using trap-filling transition coupled with molecular dynamics in poly(3-alkyl thiophene)s [P3ATs] were fabricated as potential key devices for noise-driven bio-inspired sensors and infor- mation 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 ω-2-type (if V < VTFT = 10V) and ω-1-type (if V > VTFT) power spectral densities, where V and VTFT are an applied voltage and the voltage for trap-filling transition(TFT),respectively. The noise generation is due to TFT that associated with twist dynamics of π-conjugated polymers near the order-disorder phase transition. At 298K, the quasi-stochastic behavior is more noticeable for RR-P3DT than poly(3-hexylthiophene) [RR-P3HT]. The dynamics of the order-disorder phase transition (ODT) for powder samples were also investigated by differential scanning calorimetry (DSC) measurements and high-resolution solid-state C NMR spectroscopy, and the correlation of molecular structure and dynamics with electric properties was discussed.

Paper Details

Date Published: 8 March 2014
PDF: 17 pages
Proc. SPIE 9055, Bioinspiration, Biomimetics, and Bioreplication 2014, 905509 (8 March 2014); doi: 10.1117/12.2044742
Show Author Affiliations
Naoki Asakawa, Gunma Univ. (Japan)
Teruo Kanki, Osaka Univ. (Japan)
Hidekazu Tanaka, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 9055:
Bioinspiration, Biomimetics, and Bioreplication 2014
Akhlesh Lakhtakia, Editor(s)

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