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

Naoki Asakawa; Koichiro Umemura; Shinya Fujise; Koji Yazawa; Tadashi Shimizu; Masataka Tansho; Teruo Kanki; Hidekazu Tanaka

doi:10.1117/1.JNP.8.083077

6 August 2014 Noise-driven signal transmission device using molecular dynamics of organic polymers

Naoki Asakawa, Koichiro Umemura, Shinya Fujise, Koji Yazawa, Tadashi Shimizu, Masataka Tansho, Teruo Kanki, Hidekazu Tanaka

Author Affiliations +

Journal of Nanophotonics, Vol. 8, Issue 1, 083077 (August 2014). https://doi.org/10.1117/1.JNP.8.083077

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: 100 nm)/Au, which show multiple conducting states and quasi-stochastic transitions between these states. Noise measurements indicate the ω⁻²-type (if V<V_TFT=10 V) and ω⁻¹-type (if V<VTFT) power spectral densities, where V and V_TFT 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 ¹³C nuclear magnetic resonance spectroscopy, and the correlation of the molecular structure and dynamics with electric properties was discussed.

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Naoki Asakawa, Koichiro Umemura, Shinya Fujise, Koji Yazawa, Tadashi Shimizu, Masataka Tansho, Teruo Kanki, and Hidekazu Tanaka "Noise-driven signal transmission device using molecular dynamics of organic polymers," Journal of Nanophotonics 8(1), 083077 (6 August 2014). https://doi.org/10.1117/1.JNP.8.083077

Published: 6 August 2014

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