Solid State Electrochemical Transistor Based on $\pi$-Conjugated Polymer Langmuir–Blodgett Film

概要

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A solid-state electrochemical transistor (ECT) was fabricated using a $\pi$-conjugated polymer Langmuir–Blodgett (LB) film, which was constructed from poly(N-dodecylacrylamide) (pDDA) and regioregular-poly(3-hexylthiophene) (RR-PHT) mixture. The $\pi$-conjugated polymer LB film was used as a channel layer and poly(ethylene oxide):LiClO4 was used as a solid electrolyte. The ECT showed an on/off ratio of $2.3 \times 10^{3}$ and a mobility of $7.7 \times 10^{-2}$ cm2 V-1 s-1 at a low gate voltage ($V_{\text{G}} = -2.0$ V) with a low charge consumption ($1.8 \times 10^{-9}$ mol of e-1 cm-2). Moreover, a clear saturation behavior was observed in the ECT. The saturation behavior was derived from the partial dedoping of RR-PHT located at the drain electrode because of the long channel length and low conductivity of the LB film. The low operation voltage with a clear saturation behavior is favorable for applying the ECT to the fabrication of a disposable sensor.
2010-01-25