Flexible low-voltage pentacene memory thin-film transistors with combustion-processable Al₂O₃ gate dielectric and Au nanoparticles

A Au nanoparticles (NPs) embedded pentacene thin-film transistor (TFT) with solution-based Al₂O₃ was fabricated on a polyethersulfone substrate. The TFT for low-voltage operation within -3 V was realized with the Al₂O₃ dielectric film. By a combustion process for Al ₂O₃, efficient driving of conversion reaction at low annealing temperature of 200 °C can be achieved and the device can be made on a plastic substrate. And, the Au NPs were deposited by the contact printing method using the polydimethylsiloxane stamp. From the electrical characteristics of the devices, a saturation mobility value of 4.25 cm² V ^-1 s^-1, threshold voltage (V_th) of ∼0.5 V, subthreshold swing of 70 mV dec^-1 and memory window of 0.21 V at -3 V programming gate bias voltage were obtained.