Bootstrapped inverter using a pentacene thin-film transistor with a poly(methyl methacrylate) gate dielectric

A bootstrapped inverter incorporating pentacene organic thin-film transistors (OTFTs), with poly(methyl methacrylate) as the gate dielectric, has been designed, fabricated and tested. The inverter uses capacitive coupling and bootstrapping effects, and exhibits superior performance to the normal diode-connected load inverter. The pentacene OTFTs used for the inverter possess a field-effect mobility of 0.32 cm²/V/s, a threshold voltage of -10.0 V, a subthreshold slope of 1.5 V per decade and an on/off current ratio of 2.2 times 10⁶. The inverter has a 30 mus rise time and a 450 mus fall time, at an operating frequency of 1 kHz and 30 V drive voltage.