Organic thin film transistors on back molded plastic foil

Abstract

Organic thin film transistors, unipolar inverters and ring oscillators have been fabricated on plastic foil and afterwards embedded into a plastic substrate by using an injection molding process. The transistors have an effective field-effect mobility of 0.001 cm2 V−1 s–1, an on/off ratio of 105 and threshold voltage Vth of 0.5 V while the inverter shows a gain of 1.6 at Vdd = −10 V. The five-stage ring oscillator showed an oscillation frequency of ∼11 Hz at Vdd = −10 V. The results demonstrate the transfer of organic electronic devices fabricated on plastic foil onto the surface of a 3D plastic object by using injection molding process, one of the most common modern methods of part manufacturing.