Ionic?Liquid Induced Morphology Tuning of PEDOT:PSS for High?Performance Organic Electrochemical Transistors

The ability to operate in aqueous environments makes poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate), PEDOT:PSS, based organic electrochemical transistors (OECTs) excellent candidates for a variety of biological applications. Current research PEDOT:PSS OECTs is primarily focused on improving the conductivity film achieve high transconductance (gm). improved and electronic transport are attributed formation enlarged PEDOT-rich domains shorter PEDOT stacking, but such change morphology sacrifices ionic and, therefore, doping/de-doping process. Additionally, little known about effect changes gate bias that maximum gm ( V G P e k ), threshold voltage (VT), transient behavior OECTs. Here, molecular packing nanostructure films tuned using liquids as additives, namely, 1-Ethyl-3-methylimidazolium (EMIM) cation anions chloride (Cl), trifluoromethanesulfonate (OTF), bis(trifluoromethylsulfonyl)imide (TFSI), tricyanomethanide (TCM). It demonstrated an optimal realized EMIM OTF generate smaller fibril-like with relatively loose structures. Such improves ion accessibility, lowering required completely de-dope channel, thus enabling transconductance, fast response, at lower window simultaneously.