Fully inkjet-printed short-channel organic thin-film transistors and inverter arrays on flexible substrates. (19th December 2016) - Chung, Seungjun
Abstract: We report fully inkjet-printed organic thin-film transistors (OTFTs) and inverters with an average channel length of 9 μ m and minimized overlap capacitance between gate and source/drain (S/D) electrodes on a flexible plastic substrate. Metal-organic precursor-type silver ink, poly(4-vinylphenol), and 6, 13-bis (triisopropylsilylethynyl)pentacene were used to form the gate and S/D electrodes, the gate dielectric, and the active semiconductor layer, respectively. Well-defined S/D electrodes with narrow width and spacing can be realized by introducing a separate printing process and interdigitated structure with a cartridge that can eject a 1 picoliter volume of ink droplets without any assistant surface treatments or structures. Fully inkjet-printed short channel OTFT arrays presenting an average mobility of 0.065 cm 2 V −1 s −1 and on/off ratio of 4 × 10 3 and inverter arrays exhibiting a voltage gain of 5.5 at a V DD of −30 V and good frequency response were demonstrated.