A C6-DPA/PMMA binary blend ink for high-performance inkjet-printed organic field-effect transistors

Abstract

A solution-processed small-molecule/insulator binary blend offers an optimized blending system for inkjet-printing technology. Due to the spontaneous vertical phase separation, a small-molecule OSC thin-film could be deposited with good crystallization and preferred orientation. However, the uniformity of the semiconducting thin-film is still a critical issue, and the intrinsic properties of the blend ink used in inkjet printing, especially ink stability, are rarely reported. In this paper, a blend system of 2,6-bis(4-hexylphenyl)anthracene (C₆-DPA) and polymethyl methacrylate (PMMA) is used to prepare a high-performance and stabilized electronic ink. Based on this ink, the highest mobility of inkjet-printed organic field-effect transistors is up to 2.01 cm² V⁻¹ s⁻¹ with bottom-gate and top-contact structures.