All-Inkjet-Printed Organic Thin-Film Transistor and Amplifier for Low-Power High-Gain Wearables

This invited paper reviews the recent development of all-inkjet-printed organic thin-film transistors for wearables, for which an amplifier with low power and high gain is essential for biosensors. The techniques to lower the operating voltages of printed organic transistors are discussed and summarized, by reducing the trap density within the devices. By operating the devices in the subthreshold regime, an amplifier demonstrates low power (< 1 nW) and high gain (260 V/V). With a strip-helix-fiber structure, the amplifier be potentially weaved into textiles for wearables.