Megahertz operation of flexible organic transistors

A process for the fabrication of organic transistors with channel lengths as short as 1µm on plastic substrates has been developed. The TFTs employ vacuum-deposited small-molecule semiconductors and a low-temperature-processed gate dielectric that allows the TFTs to operate with voltages of 3V. The p-channel TFTs have a field-effect mobility of about 1cm²/Vs, an on/off ratio of 10⁷, and a signal propagation delay of 300ns per stage. For the n-channel TFTs, a field-effect mobility of 0.06cm²/Vs, an on/off ratio of 10⁶, and a signal propagation delay of 17µs per stage have been obtained.