Tuning the Semiconducting Properties of Sexithiophene byα,ω-Substitution—α,ω-Diperfluorohexylsexithiophene: The First n-Type Sexithiophene for Thin-Film Transistors

The first substituent-induced “flip” from p- to n-type conductivity as well as enhanced thermal stability and volatility are found for fluorocarbon-functionalized sexithiophene 1 (relative to the fluorine-free analogues 2 and 3). Evaporated films of 1 behave as n-type semiconductors, and can be used to fabricate thin-film transistors with field-effect mobilities as high as 0.02 cm2 V−1 s−1—some of the highest reported to date for n-type organic semiconductors.