All-Inkjet-Printed Organic Thin-Film Transistor Inverter on Flexible Plastic Substrate

摘要

We report an all-inkjet-printed inverter using two p-type organic thin-film transistors (OTFTs) on a flexible plastic substrate. Metal–organic precursor-type silver ink, poly-4-vinylphenol solution, and 6,13-bis (triisopropylsilylethynyl)-pentacene solution were used to print gate and source/drain electrodes, gate-dielectric layer, and active semiconductor layer, respectively. By optimizing fabrication conditions, we obtained OTFTs with a mobility of 0.02 $hbox{cm}^{2}/hbox{V}cdothbox{s}$, an on/off ratio of $hbox{10}^{4}$, and a threshold voltage of $-$1.2 V, and inverters with good switching performance showing a gain of 7.8 at a supply voltage of ${V}_{rm DD}= -hbox{40} hbox{V}$ .