Organic thin-film transistor (OTFT) has attracted considerable research interest in the past decades because of its great potential on flexible electronic applications. So far, there is still a big challenge to integrate high electrical properties and mechanical bending stability in single OTFT via a simple approach. A type of dielectric material possessing excellent flexibility, insulating property, compatibility with multiple organic semiconductors, and easy maneuverability are desirable. In this letter, the OTFT based on polyphenyleneoxide (PPO) dielectric, selected out from 10 different kinds of common polymers, shows invariant high mobility of around 1.5 cm<sup>2</sup>/Vs even after 5000-times mechanical bending with a small bending radius of merely 4 mm. Whereas the mobilities of OTFTs based on other polymeric dielectrics, such as PS and PMMA, obviously decrease within 100-times curving. Subsequently, flexible oscillators have also been fabricated based on PPO dielectric, which show negligible change on electrical performance after 500-times mechanical curving.

Polyphenyleneoxide dielectric for flexible semitransparent organic transistors and circuits with good mechanical bending stability

2019 Spring National Meeting

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