Vertically Phase-Separated PEDOT:PSS Film via Solid-Liquid Interface Doping for Flexible Organic Electrochemical Transistors.

Organic electrochemical transistors (OECTs) are seen as some of the most promising devices in organic bioelectronics. Recent interest in OECTs is sparked by the high performance of an organic semiconductor channel material, i.e.

Metal-Like Conductivity in Acid-Treated PEDOT:PSS Films: Surpassing 15,000 S/Cm.

Although poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) films with high conductivity have been obtained through conventional organic solvent and acid treatment, their conductivity has not yet exceeded 10000 S/cm. In this paper, by combining blade-coating and treating with high concentration and volatilizable trifluoromethanesulfonic acid (CFSOH), PEDOT:PSS films with ultrahigh conductivity of 15143 S/cm, comparable to some metals, were prepared. Characterizations of morphology and structure indicate the formation of a perfectly continuous fibrous network structure, highly oriented crystallization, and tightly packed π-π stacking of PEDOT chains after removing a vast amount of PSS, which contributes to boosting the electrical conductivity of the treated PEDOT:PSS film.