Nanostructure Dependence of Field-Effect Mobility in Regioregular Poly(3-hexylthiophene) Thin Film Field Effect Transistors

摘要

Semiconducting conjugated polymers and oligomers have been extensively investigated in the past two decades for electronic applications such as light-emitting diodes (LEDs), field effect transistors (FETs), and photovoltaic cells (PVs). In organic semiconductors, both the properties of the individual molecules and the structural order of the molecules in the film determine the macroscopic properties of the material. This is particularly evident in the case of regioregular poly(3-hexylthiophenes) (RR-P3HTs), which are among the most studied conjugated semiconducting polymers. RR-P3HTs have a high tendency to self-assemble into highly ordered, partially crystalline structures – periodically layered, π-stacked sheets. This facilitates charge carrier transport and results in dramatic improvement of field effect mobilities.