Yamaguchi, Y.; Ogawa, K.; Nakayama, K.-I.; Ohba, Y.; Katagiri, H. J Am Chem Soc 2013, ASAP.
We present herein a linear expanded π-conjugation system comprising azulene units:2,6′:2′,6″-terazulene. This simple hydrocarbon exhibits excellent n-type transistor performance with an electron mobility of up to 0.29 cm2 V–1 s–1. The lowest unoccupied molecular orbital (LUMO) is well distributed over the entire molecule, whereas the highest occupied molecular orbital (HOMO) is localized at one end. These findings indicate a disadvantage of hole carrier transport and an advantage of n-type-specific transport behavior. This system presents an unconventional concept: polarity control of OFET by molecular orbital distribution control.
Dr. Hiroshi Katagiri is working in Yamagata University as an assistant professor. His research interesting is development of high-performance organic material based on π-Conjugated organic compounds such as acenes and aromatic oligomers.