Organic inverter circuits employing ambipolar pentacene field-effect transistors

Abstract
Ambipolar transport has been observed in pentacene films grown on polyvinyl alcohol gate dielectric with hole and electron mobilities of 0.3 and 0.04 cm 2 ∕ V s , respectively. A simple device structure with Au as source-drain electrode can be used to operate a transistor in both p -channel and n -channel modes without employing low work function metal electrodes for ambipolar charge injection. Using ambipolar pentacene field-effect transistors, we construct a complementarylike inverter with voltage inversion gain of ∼ 10 . These inverters are able to operate both in first and third quadrants of the voltage output to voltage input characteristics which is a unique feature of employing ambipolar transistors.