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

Naoki Asakawa; Teruo Kanki; Hidekazu Tanaka

doi:10.1117/12.2044742

8 March 2014 Noise-driven signal transmission device using molecular dynamics of organic polymers

Naoki Asakawa, Teruo Kanki, Hidekazu Tanaka

Proceedings Volume 9055, Bioinspiration, Biomimetics, and Bioreplication 2014; 905509 (2014) https://doi.org/10.1117/12.2044742
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2014, San Diego, California, United States

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 < V_TFT = 10V) and ω^-1-type (if V > V_TFT) power spectral densities, where V and V_TFT 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.

Citation Download Citation

Naoki Asakawa, Teruo Kanki, and Hidekazu Tanaka "Noise-driven signal transmission device using molecular dynamics of organic polymers", Proc. SPIE 9055, Bioinspiration, Biomimetics, and Bioreplication 2014, 905509 (8 March 2014); https://doi.org/10.1117/12.2044742

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