Advanced Materials

Crystal structures of oligothiophenes and their relevance to charge transport

Authors

  • Dr. Shu Hotta,

    Corresponding author
    1. Advanced Materials Research Lab. Matsushita Research Institute Tokyo, Inc. 3-10-1 Higashimita, Tama-ku, Kawasaki 214 (Japan)
    • Advanced Materials Research Lab. Matsushita Research Institute Tokyo, Inc. 3-10-1 Higashimita, Tama-ku, Kawasaki 214 (Japan)
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    • was born in Osaka, Japan in 1950. He completed his undergraduate studies in applied chemistry at Kyoto Institute of Technology in 1973 and received his M. S. degree in hydrocarbon chemistry at Kyoto University in 1975. Immediately after this he obtained a research position at the Wireless Research Laboratory of the Matsushita Electric Industrial Co., Ltd. and subsequently a research position at the Central Research Laboratories in Matsushita. From 1985–1987 he stayed in the group of Professor A. J. Heeger at the University of California, Santa Barbara. He obtained his Ph.D. degree in hydrocarbon chemistry at Kyoto University in 1988. He joined the Quantum Wave Project, Exploratory Research for Advanced Technology (ERATO), Research Development Corporation of Japan (JRDC) in 1989. From October 1, 1993 he has been working at the Matsushita Research Institute. His major research activities are directed to the synthesis and electronic properties of specialty organic and polymer materials.

  • Katsunori Waragai

    Corresponding author
    1. Advanced Materials Research Lab. Matsushita Research Institute Tokyo, Inc. 3-10-1 Higashimita, Tama-ku, Kawasaki 214 (Japan)
    • Advanced Materials Research Lab. Matsushita Research Institute Tokyo, Inc. 3-10-1 Higashimita, Tama-ku, Kawasaki 214 (Japan)
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    • was born in Fukushima, Japan in 1963. He majored in the theory of elementary particles and graduated from the Department of Physics of Tohoku University in 1986. Immediately after this he obtained a research position at Matsushita Research Institute Tokyo, Inc. in Matsushita Electric Industrial Co., Ltd. From 1986–1989, he studied the physical properties of organic materials such as oxygen enriching membranes and the electronic properties of phthalocyanines. He joined the Quantum Wave Project, ERATO, JRDC in 1989, and has been conducting research into the electronic properties of specialty materials, especially conducting polymers and oligomers.


  • We thank Mr. T. Kurumizawa for carefully making the AFM measurements and for arranging the AFM diagrams. The work reported here was carried out by the authors while at the Quantum Wave Project, ERATO, Research Development Corporation of Japan.

Abstract

The crystal structures and morphologies of oligothiophenes, in the form of both single crystals and thin films, are reviewed and compared with those of other oligomers and conducting polymers. The “herringbone” structure emerges as a pivotal motif, in particular for charge transport. Although further research is necessary to elucidate the charge transport mechanism, this does not prevent the structural and electronic features of conducting oligomers being exploited in electronic devices such as FETs and LEDs.

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