Porphyrin Derivatives in Transistors and Nano/Micro Sized Coordination Polymers

Abstract

Recently, the charge-transport phenomena of organic conjugated materials have been intensively investigated because of the potential applications in electronics and optoelectronics. Among them, organic field-effect transistors (OFETs) fabricated from either thin films or well-defined single crystals (SCs) as charge-transporting layers are one of the most promising electronic devices. In particular, the unique anisotropic arrangement of organic semiconducting molecules owing to their strong intermolecular interactions is expected to have a significant influence on the OFET performance, because the larger overlap of pi-orbitals between neighboring molecules may increase the bandwidth and facilitate charge-transport. In this regards, porphyrin is one of the most important p-conjugated planar molecules and they have often been employed in OFETs, organic phototransistors (OPTs), and organic photovoltaics (OPVs). A deeper understanding of such systems has hardly been achieved because of the lack of information on the molecular packing and intermolecular arrangement (which are closely related to the OFET performance), since most porphyrin-based OFET devices are based on thin films or polycrystalline objects prepared by spin-coating or vacuum-deposition processes and showing relatively poor device performances because of the limitation in use of pi-conjugation. For a high degree of crystallinity with an excellent determinacy as well as a high corresponding device performance, the extension of pi-orbitals and the location of conjugative substituents on the porphyrin core may play major roles. Therefore, I like to present a series of new pi-extended porphyrin derivatives and their OFET devices performances along with films and single-crystals. In addition, I like to introduce the rational synthesis of porphyrin based unique structures with a variety of morphologies obtained from the manipulation of secondary substituents (i.e., substituents that are not directly bonded to the porphyrin ring) and the introduction of various metals to engender van der Waals interactions beyond the immediate porphyrin ring and metal meditated coordination bondings. So, I like to introduce porous coordination polymer particles assembled by a simple synthetic manipulation and their applications in heterogeneous catalysis.