Freeform Fabrication of Organic Electrochemical Transistors

摘要

Solution-processable organic semiconductors can be used to print transistors under ambient conditions which are robust enough to function on flexible substrates, and are useful for inexpensive, disposable, and/or flexible applications. Specifically, organic electrochemical transistors (ECT) function at low voltages and with large feature sizes, making them good candidates for freeform fabricated devices. Here we report the first functional ECTs produced via freeform fabrication on glass substrates. These show robust behavior over at least one hour and several measurement cycles, have a source-drain current of O.1μA at -0.5Vsd, which is an order of magnitude larger than the gate (leakage) current, and an on/off ratio of 2 at 0.2Vgate. These preliminary devices have source-drain current three orders of magnitude lower than literature values for similar ECTs. This work has enabled us to study ECT behavior on printable substrates, necessary to ultimately incorporating ECTs into fully integrated freeform fabricated electromechanical devices.