6 August 2014 Noise-driven signal transmission device using molecular dynamics of organic polymers
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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 VTFT=10  V) and ω−1-type (if VV 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 13C nuclear magnetic resonance spectroscopy, and the correlation of the molecular structure and dynamics with electric properties was discussed.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Naoki Asakawa, Koichiro Umemura, Shinya Fujise, Koji Yazawa, Tadashi Shimizu, Masataka Tansho, Teruo Kanki, 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

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