Low-operating-voltage pentacene field-effect transistor with a high-dielectric-constant polymeric gate dielectric

Abstract

Low-operating-voltage organic field-effect transistor has been realized by using the cross-linked cyanoethylated poly(vinyl alcohol) (CR-V) as a gate dielectric. The cross-linked CR-V dielectric was found to have a high dielectric constant of 12.6 and good insulating properties, resulting in a high capacitance ($92.9\mathrm{nF}∕{\mathrm{cm}}^2$ at $20\mathrm{Hz}$ ) for a dielectric thickness of $120\mathrm{nm}$ . A pentacene field-effect transistor fabricated with the cross-linked CR-V dielectric was found to exhibit a high carrier mobility $(0.62{\mathrm{cm}}^2∕\mathrm{V}\mathrm{s})$ , a small subthreshold swing $(185\mathrm{mV}∕\text{decade})$ , and little hysteresis at low operating voltages $(⩽-3\mathrm{V})$ .