Through the research to investigate the operation mechanism of the low-voltage Organic thin-film transistors (OTFT), our result suggested the crystallinity of the semiconductor layer is key to the low-voltage operation of the OTFT. On the other hand, the quantitative evaluation of the hetero interface (polymer-small molecule interface, semiconductor layer-insulating layer interface) and carrier traps existing inside the semiconductor layer in the OTFT did not proceed as planned. We will continue to study this point. With regard to investigation on choice of insulator materials, we were able to discover promising materials that would lead to low voltage operation of OTFTs.
Regarding the application of OTFTs to sensing devices, the flexible OTFT based sensors have been successfully fabricated, such as pressure sensors and strain sensors.