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Solid State Electrochemical Transistor Based on π-Conjugated Polymer Langmuir–Blodgett Film

A solid-state electrochemical transistor (ECT) was fabricated using a π-conjugated polymer Langmuir–Blodgett (LB) film, which was constructed from poly(N-dodecylacrylamide) (pDDA) and regioregular-poly(3-hexylthiophene) (RR-PHT) mixture. The π-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 ×103 and a mobility of 7.7 ×10-2 cm2 V-1 s-1 at a low gate voltage (VG = -2.0 V) with a low charge consumption (1.8 ×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.