High‐Performance Solution‐Processable Poly(<b><i>p</i></b>‐phenylene vinylene)s for Air‐Stable Organic Field‐Effect Transistors

Abstract

Abstract The influence of the substitution pattern (unsymmetrical or symmetrical), the nature of the side chain (linear or branched), and the processing of several solution processable alkoxy‐substituted poly( p ‐phenylene vinylene)s (PPVs) on the charge‐carrier mobility in organic field‐effect transistors (OFETs) is investigated. We have found the highest mobilities in a class of symmetrically substituted PPVs with linear alkyl chains (e.g., R 1 , R 2 = n ‐C 11 H 23 , R 3 = n ‐C 18 H 37 ). We have shown that the mobility of these PPVs can be improved significantly up to values of 10 –2 cm 2 V –1 s –1 by annealing at 110 °C. In addition, these devices display an excellent stability in air and dark conditions. No change in the electrical performance is observed, even after storage for thirty days in humid air.