p -type semiconducting α,ω-dihexylsexithiophene for an organic thin film transistor

End substitution of sexithiophene with hexyl groups, α,ω-dihexylsexithiophene (DH-6T), leads to a highly soluble conjugated oligomer. In this paper, we report on the synthesis of an air-stable p-type organic semiconductor, DH-6T. We also report on our analysis of its thermal, optical, and electrical properties. We obtained a stable characteristic curve. The field-effect performance had a mobility of 3.29×10−4cm2∕Vs, while the threshold voltage was about −19V. The current on/off ratio was greater than 106 when the gate voltage was scanned from −40to0V.