Organic Charge-Transfer Complex based Microstructure Interfaces for Solution-Processable Organic Thin-Film Transistors toward Multifunctional Sensing

The development of organic field-effect transistor (OFET) based sensors is in high demand for flexible electronics. Herein, a new and feasible procedure to grow donor-acceptor complex microstructures sandwiched between the semiconducting and insulating layers is reported. To realize a well-distributed, uniform-sized structure through coating on the gold patterned substrate, the dopping ratio of the organic donor-acceptor complex in the host polymer is optimized. This method leads to one-step fabrication of high-performance semiconductor thin-films and a microstructured binary system attached to it via successful phase separation. The OFET sensors prepared by this technique demonstrate ideal hole-transport properties and good pressure response. In addition, the thermal-sensitivity is also revealed, which enables the device architectures to be multifunctional. This work opens a new avenue to manufacture functional microstructure and flexible OFET based pressure sensors.