Gravure printed ultra-thin dielectric for low voltage flexible organic field-effect transistors

Organic electronics requires dielectrics which can be processed over large areas at low temperature in ambient using simple solution based techniques. Here a crosslinkable acrylate‐based organic dielectric is reported, which is gravure printable on plastic substrates, patternable by conventional photolithography, and can form electrically functional films at thicknesses below 100 nm. Capacitors are successfully fabricated with film thicknesses of 50 and 70 nm, and organic field effect transistors with thicknesses of 70 nm, transistors with gold contacts patterned by lift‐off on top of the dielectric followed by spin‐cast 6,13‐bis(triisopropylsilylethynyl)‐pentacene showing near ideal behavior at operating voltages as low as −1 V. Importantly saturation, a requirement for digital logic, in transistors is achieved with gate lengths of 2.7 µm, at the limit of conventional photolithography. This demonstrates that such materials have potential in flexible organic electronic devices requiring digital signal processing and low voltages