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Fully mass printed, flexible and truly polymeric organic field effect transistors consisting of a three layer dielectric made of CYTOP (low-k), PVA (intermediate) and P(VDFTrFE-CTFE)(high-k) are introduced. Gravure-, flexo-and screen printing were selected as highly productive manufacturing technologies. These OFETs work at strongly reduced voltages and show high field effect mobility (m 5 0.2 cm 2 /Vs) and remarkable good bias stress stability at very high current density (50 mA/mm). Fully printed OFETs are used for the realization of ring oscillators working in the kHz regime at reduced supply voltage (10 V). In combination with printed fully polymeric piezoelectric loudspeakers, this work shows for the first time fully printed flexible audio systems.

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The influence of post-press treatment on the modification of printed source/drain electrodes made of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) with ethylene glycol is presented. Beside changes of the geometry and the conductivity of these mass printed structures, the work function of PEDOT:PSS can be tuned, leading to an improved performance of organic field effect transistors (OFETs). OFETs were built up with a new small molecule/polymer blend consisting of 6,13-bis[(cyclopropyldiisopropylsilyl)ethynyl] pentacene and poly(triarylamine), providing a field effect mobility of 0.2 cm2/Vs for fully printed devices in air. Ring oscillators based on these OFETs demonstrate a frequency of more than 1 kHz.