We demonstrate that the degree of charge delocalization has a strong impact on polarization energy and thereby on the position of the transport band edge in organic semiconductors. This gives rise to long-range potential fluctuations, which govern the electronic transport through delocalized states in organic crystalline layers. This concept is employed to formulate an analytic model that explains a negative field dependence coupled with a positive temperature dependence of the charge mobility observed by a lateral time-of-flight technique .
COBISS.SI-ID: 4915195
Presented here is a novel and efficient method used to improve carrier mobilities of poly(3- hexylthiophene) -based organic field effect transistors by means of nanowire formation. The treatment, termed solvation, consists of depositing a small quantity of a solvent directly on top of a previously deposited semiconducting film, and allowing the solvent to evaporate slowly. Such treatment results in an increase of the saturation mobility by more than one order of magnitude, from 1.3 10 3 up to 3.4 10 2 cm2/Vs, while devices preserve their high ON/OFF ratio of ~104.
COBISS.SI-ID: 4099579