Physics of Organic Field-Effect Transistors and the Materials

Organic semiconductors that were discovered more than half century ago in Japan (H. Inokuchi, Org. Electron. 7, 62 (2006)) are now transfigured into the practicable electronic materials by the recent concentrated studies of the materials, thin-film processing, and device fabrication technologies. In this chapter, we first present and discuss fundamental aspects of electronic phenomena in organic semiconductors as the bases to understand and study the organic electronics technologies. Then we discuss how to understand the charge carrier transport and the carrier states in organic field-effect transistors (OFETs or also frequently referred as organic thin-film transistors, or OTFTs). Finally, we introduce some new concepts to fabricate OFETs by print production technologies, and also present some recent studies to develop materials and processing for realizing high performance printed OFETs.