From ambi- to unipolar behavior in discotic dye field-effect transistors.

Tsao, Hoi Nok; Pisula, Wojciech; Liu, Zhihong; Osikowicz, Wojciech; Salaneck, William R; Müllen, Klaus · Adv Mater · 2008

basic_science · Level V

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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.