Poly(Vinyl Alcohol) Gate Dielectric Treated With Anionic Surfactant in C₆₀ Fullerene-Based n-Channel Organic Field Effect Transistors

We report on the preparation and performance enhancement of n-type low-voltage organic field effect transistors (FETs) based on cross-linked poly(vinyl alcohol) (cr-PVA) as gate dielectric and C₆₀ fullerene as channel semiconductor. Transistors were prepared using bottom-gate top-contact geometry and exhibited field-effect mobility (µ_FET) of 0.18 cm²V^-1s^-1. Treatment of the gate dielectric surface with an anionic surfactant, sodium dodecyl sulfate (SDS), passivates the positively charged defects present on the surface of cr-PVA, hence resulting in overall transistor performance improvement with an increase in µ_FET to 1.05 cm²V^-1s^-1 and additional significant improvements in dielectric capacitance, transistor on/off current ratio and transconductance.

Keywords
organic field-effect transistors; C₆₀; poly(vinyl alcohol); surfactant