 They were created using 3-D printers using inkjet or gravure methods on flexible substrates, including polyimide and polyethylene (PET) and transparent substrates such as glass.These transistors reliably exhibit high-mobilities (> 10 cm2 V−1 s−1) and ON/OFF ratios (> 1000) as well as threshold voltages below 5 V. They offer current density and low power consumption as well as environmental stability and mechanical flexibility.Hysterisis in the current-voltage curses as well as variability in the threshold voltage remain to be solved.