Characterization of 6,13-bis(triisopropylsilylethynyl) pentacene organic thin film transistors fabricated using pattern-induced confined structure

Abstract

Bottom gate organic thin film transistors (OTFTs) were fabricated on polyethersulphone substrate using an ink jet printing method. 6,13-bis(triisopropylsilylethynyl) (TIPS) pentacene and poly-4-vinylphenol (PVP) were used as an active material and as a gate insulator, respectively. In an attempt to reduce the coffee stain effect, TIPS pentacene active layer was printed onto the pattern-induced confined structure (PICS) which had been obtained by orthogonally printing Ag electrodes on the pre-printed PVP layer. The resolution of Ag patterns was obtained by modifying the surface energy using UV irradiation and substrate temperature. The channel lengths of the aforementioned PICS OTFTs were in the range of 10μm to 50μm. The average mobility and on/off ratio of PICS OTFTs were 0.034cm2/Vs and 103, respectively.