Enhanced performance of all organic field-effect transistors and capacitors through choice of solvent

摘要

We demonstrate low-operating voltage, high mobility, and stable organic field-effect transistors (OFETs) using both non-polar and polar polymeric dielectrics such as poly(4-vinyl phenol) (PVP), poly methyl metacrylate (PMMA), and polyvinylidene fiuoride-trifiuoroethylene (PVDF-TrFe), dissolved in solvents of varying dipole moment. High dipole moment solvents used for dissolving the polymer dielectric enhances charge carrier mobilities by orders of magnitude in pentacene OFETs compared to low dipole moment solvents. Fast switching circuits with patterned gate PVP-based pentacene OFETs demonstrated a switching frequency of 75 kHz at input voltages of |5V|. Remarkably, these pentacene-based OFETs exhibited high stability under bias stress and in air with negligible shifts in the threshold voltage.