From Ambi‐ to Unipolar Behavior in Discotic Dye Field‐Effect Transistors

Abstract

Ambipolar, solution-processed thin-film transistors based on a discotic dye turn into unipolar behavior after thermal annealing. No evidence for temperature-induced change in injection barrier or interface trapping can be found to explain this phenomenon. Instead, a variation in morphology is considered as the cause for the observed transition from ambipolar to unipolar charge transport.