Application of organic field-effect transistors in electronic charge transport

Organic field-effect transistors (FETs(and light emitting diodes have attracted much interest based on possible inexpensive and flexible alternatives. However, a better understanding of the nature of charge transport in these devices and the physics of contacts is crucial for further development. While it is known that the charge-carrier mobility in organic semiconductors is only weakly dependent on the electric field at low fields, the experimental mobility in organic field-effect transistors using silylethynyl-substituted pentacene is found to be surprisingly field dependent at low source-drain fields. This research investigates about understanding and characterizing the transport mechanisms of charge carriers in solution processed poly (3-hexylthiophene) field-effect devices. Charge transport from different source/drain electrodes such as Au, Cu and Cr was examined over a broad temperature range. The results show chemically increasing the injecting electrode work function significantly improves hole injection relative to untreated Au electrodes.