Collaborative research groups such as the University of Tokyo, National Institute of Advanced Industrial Science and Technology, and Picrystal Co., Ltd. have produced organic semiconductor wafers with a thickness of three layers of molecules, which can be used as high-performance transistors, by a simple printing method.
Organic semiconductors have been expected as next-generation electronic materials that can be mass-produced at low cost by replacing the current silicon semiconductors from the viewpoints of light weight, flexibility, print compatibility, and the like.However, many organic semiconductors rarely have both low-temperature printing performance and excellent semiconductor characteristics, and research and development of practical electronic devices in the world has not progressed.It was also important to establish a process technology with excellent uniformity and reproducibility to bring out high organic transistor performance.
Previously, the research group had succeeded in producing an ultrathin organic semiconductor single crystal film with a thickness of about two layers of molecules.In printing an ultra-thin single crystal film, a single crystal thin film grows only at the scan location of the nozzle that ejects organic semiconductor ink by a unique method.In principle, it was said that the printing time per unit area could be reduced by widening the nozzle width.
This time, the nozzle width has been expanded to 4 cm, which is more than four times the conventional width, and peripheral devices and printing conditions have been improved to make a 9 inch ultra-thin organic semiconductor single crystal film with a thickness of about 3 layers (12 nanometers) of molecules. It was demonstrated that a class wafer can be produced.It was found that 4 transistors made from this single wafer operated without defects, and the average charge mobility was 1 cm1,600 / Vs, which is the highest class among the current organic transistors.
The printing method this time consumes much less material than conventional organic semiconductor printing, and it is thought that the process time can be shortened and the printing area can be increased in scale, which is expected to significantly reduce costs in future industrial applications. There is.
Paper information:[Scientific Reports] Mechanism of Common-mode Noise Generation in Multi-conductor Transmission Lines
