High-<i>k</i> Polymeric Gate Insulators for Organic Field-effect Transistors.

The gate insulators play a role as important as the semiconductor in high-performance OFETs with high on/off current ratio, low hysteresis, and device stability. The essential requirements for gate dielectrics include high capacitance, high dielectric breakdown strength, solution-processibility, and flexibility. In this paper, we review recent progress in developing high-k gate polymeric insulators for modern organic electronic applications in recent years. After a general introduction to OFETs, three types of high-k polymeric gate insulating materials have been enumerated in achieving high-quality OFETs, including polymer gate insulators, polymer-inorganic gate composites or bilayers, and ion gel electrolytes. Especially, we emphasize the significance, implementation and development of high-k polymeric gate insulators used in OFETs for future low-voltage operated and flexible electronics. Finally, a brief summary and outlook will be presented. &#13; &#13.