Three-dimensional organic field-effect transistors on plastic substrates: flexible transistors with very high output current

摘要

Attractiveness of organic field-effect transistors are in their low-cost and easy fabrication processes as well as their mechanical flexibility, while a significant drawback has been their poorer transistor performances than those of silicon and oxide semiconductors because of lower carrier mobility in organic semiconductors. We have developed an easy MEMS-based process to fabricate three-dimensional organic transistors with metal-insulator-semiconductor structures of multiple vertical channels on plastic platforms. The design maximizes the space availability and the output current per area. The flexible three-dimensional organic transistors indeed present outstanding current of ～0.5 A/cm~2, which is more than sufficient for driving pixels of typical organic light-emitting diodes. High on-off ratio up to 10~7 is also demonstrated.