The performances of organic field-effect transistors (OFETs) have been significantly improved in the last decade. 1 Particularly, the p-channel OFET has now achieved many important milestones: high mobility (∼5.0 cm 2 V −1 s −1 ), 2 solution processability, 3 air-stability, flexibility, low-voltage operation, 4 and so on. For these achievements, the development of new superior materials, in particular, new organic semiconductors have contributed ...