Toward improved and tunable polymer field-effect transistors

Edman, Ludvig; Swensen, James; Moses, Daniel; Heeger, Alan J.
May 2004
Applied Physics Letters;5/10/2004, Vol. 84 Issue 19, p3744
Academic Journal
We report an electrochemical method to improve charge injection in thin-film field-effect transistors fabricated with semiconducting polymers. By having ions, which are mobile only at elevated temperatures, in the active material [a mixture of a soluble poly(para-phenylene vinylene) copolymer, a crown ether and a LiCF3SO3 salt] we create electric double layers at the drain/source Au electrode interfaces by applying a low voltage (V=2V) at T=85°C for a short time (t ∼1-5 min). After cooling to room temperature under applied voltage, we demonstrate significantly improved transistor performance. In addition, we present evidence of reversible electrochemical doping in this active material.


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